metals

different methods and techniques for the determination of the metals

Assessing heavy metal sources in agricultural soils of an European Mediterranean area by multivariate analysis.

Analyte: cadmium; chromium; cobalt; copper; iron; lead; manganese; metals, heavy; nickel; zinc;

Matrix: soil;
soil - detmn of heavy metals in agricultural, by AAS and microwave digestion

Technique: digestion, microwave
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: According to the European Thematic Strategy for Soil Protection, the characterization of the content and source of heavy metals in soils are necessary to establish quality standards on a regional level that allow the detection of sampling sites affected by pollution. In relation to this, the surface horizons of 54 agricultural soils under vegetable crops in the Alicante province (Spain), a representative area of the European Mediterranean region, were sampled to determine the content of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn. Analytical determinations were performed by atomic absorption spectroscopy after microwave sample digestion in acid solution. Results indicated that heavy metal levels were similar to those reported by authors working on agricultural soils from other parts of the Mediterranean region, with the exception of Cu and Pb in some samples. Multivariate analysis (principal component analysis and cluster analysis) was performed to identify a common source for heavy metals. Moreover, soil properties were determined in order to characterize agricultural soils and to analyze relationships between heavy metal contents and soil properties. The content of Co, Cr, Fe, Mn, Ni and Zn were associated with parent rocks and corresponded to the first principal component called the lithogenic component. A significant correlation was found between lithogenic metals and some soil properties such as soil organic matter, clay content, and carbonates, indicating an important interaction among them. On the other hand, elements such as Cd, Cu and Pb were related to anthropic activities and comprised the second (Cu and Pb) and third principal components (Cd), designated the anthropogenic components. Generally, Cd, Cu and Pb showed a lower correlation with soil properties due to the fact that they remain in available forms in these agricultural soils. Taking into account these results and other achieved in other parts of the European Mediterranean region, it can be concluded that soil quality standards are highly needed to declare soils affected by human induced pollution. This is particularly relevant for anthropogenic metals (Cd, Cu and Pb, and in some areas also Zn). Further research in other agricultural areas of the region would improve the basis for proposing such soil quality standards.


Leaching of aluminium from utensils during cooking of food.

Analyte: aluminium;
aluminium [7429-90-5] - detmn of, in foods, by AAS, in study of leaching from cooking utensils

Matrix: Amomum; cardamom; chick-pea; chilli; cinnamon; clove; coriander; cumin; fenugreek; foods; garlic; mustard; onion; pepper (Piper); pigeon-pea; rice; tamarind; turmeric; wheat;
Amomum
cardamom
chick-pea
chilli
cinnamon
clove
coriander
cumin
fenugreek
foods - detmn of aluminium in, by AAS, in study of leaching from cooking utensils
garlic
mustard
onion
pepper (Piper)
pigeon-pea
rice
tamarind
turmeric [458-37-7]
wheat

Technique: spectrometry, atomic-absorption (AAS)

Language: English

Abstract: The use of aluminium utensils for cooking provides an important route for aluminium metal to enter foods. Leaching of aluminium from utensils made of aluminium, indalium (alloy of aluminium), stainless steel and hard anodised aluminium was studied under different conditions of pH and boiling time. Low pH was found to enhance leaching of aluminium from the utensils. The leaching was found to be the highest during first-time preparation (new utensils) of all the foods as compared with second-and third-time preparations using the same utensils. Leaching of aluminium during the preparation of various traditional Indian foods was found to be negligible in hard anodised aluminium utensils, indicating the advantage of using such vessels for food preparation over simple aluminium and indalium utensils. Cereals contribute a smaller amount of aluminium to the total daily intake than legumes.

Assessment of daily dietary intake of Hg and some essential elements in diets of children from the Amazon region.

Authors: Farias, L. A.; Favaro, D. I. T.; Maihara, V. A.; Vasconcellos, M. B. A.; Yuyama, L. K.; Aguiar, J. P. L.; Alencar, F. J.; lufarias@usp.br; Neutron Activation Anal. Lab. IPEN/CNEN-SP, 05422-970 Sao Paulo, Brazil

Source: Journal of Radioanalytical and Nuclear Chemistry, 2006, 270 (1), 217-223

ISSN: 0236-5731

Analyte: calcium; elements; iron; mercury; potassium; selenium; sodium; zinc;
calcium [7440-70-2]
elements - detmn of essential, in foods, by NAA and sample prep., in study of daily dietary intake by children
iron [7439-89-6]
mercury [7439-97-6] - detmn of, in foods, by AAS and sample prep., in study of daily dietary intake by children
potassium [7440-09-7]
selenium [7782-49-2]
sodium [7440-23-5]
zinc [7440-66-6]

Matrix: foods; foods;
foods - detmn of essential elements in, by NAA and sample prep., in study of daily dietary intake by children
foods - detmn of mercury in, by AAS and sample prep., in study of daily dietary intake by children

Technique: radioactivation analysis, neutron (NAA)
sample preparation (sample prep.)
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: Daily dietary intake of Hg and some essential elements in diets of children from communities in the Jau National Park, Amazon region, were assessed. Diet samples were analyzed for total Hg content using cold vapor atomic absorption spectrometry and Ca, Fe, K, Na, Se and Zn contents by instrumental neutron activation analysis. The weekly tolerable provisional intake for Hg in the communities studied varied from 13 to 57 mg of Hg per kg of body weight, exceeding the limit of 5 mg kg−1 set by the WHO. Comparison of the daily dietary intake values to the new Dietary Reference Intakes (4–8 years), showed prevalence of inadequacy.

Use of sugar cane bagasse as solid phase extractor for cadmium determination by FAAS.

Analyte: cadmium;
cadmium [7440-43-9] - detmn of, in foods, by flow-injection AAS and SPE

Matrix: foods; leaves; liver; sardine; shrimp; spinach; tomato; tuna;
foods - detmn of cadmium in, by flow-injection AAS and SPE
leaves
liver
sardine
shrimp
spinach
tomato
tuna

Technique: extraction, solid-phase (SPE) - sugar cane bagasse as extractor for, in detmn of cadmium, in foods
flow-injection analysis (FIA)
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: The present paper describes the use of sugar cane bagasse as solid phase extractor for cadmium determination after complexation of the analyte with ammonium diethyldithiophosphate (ADDP) and sorption of the Cd-DDP complexes on the solid support. The concomitants were separated using a flow injection analysis (FIA) system coupled to flame atomic absorption spectrometry (FAAS) for determination. The main parameters such as ADDP concentration, acid medium, flow rate, reaction coil length, and reaction time were investigated. The results obtained with HNO3 showed good accuracy and precision. The enhancement factor was 20.5 times for a 120 second preconcentration time, and the analytical frequency was 25 determinations per hour. The calibration curve was linear over the concentration range of 1–40 μg L−1 Cd with a LOD of 0.697 μg L−1 with a relative standard deviation of 0.96% after 12 successive measurements of 30 μg L−1 Cd. The proposed method was evaluated for the FIA-FAAS analysis of certified reference materials (tomato leaves, spinach leaves, and bovine liver) and Cd-spiked foods (shrimp, sardine, tuna, chicken liver and bovine liver). Good recoveries (80.0–97.1%) for the Cd-spiked samples and certified reference materials were obtained. The results of bagasse-packed minicolumns were compared with Si-C18 packed minicolumns. The F-test was applied between Si-C18/Bagasse minicolumns, Si-C18/certified values, and bagasse/certified values. It was found that the results were in agreement with the certified values at a 95% confidence level.

 

 

Determination of Cr in vacant capsules by graphite furnace atom absorbance spectrometry.

Authors: Yu, H.; Chen, C.; Chen, Y.; ybc@zjyj.org.cn Zhejiang Inst. Drug Control, Hangzhou 310004, China

Source: Yaowu Fenxi Zazhi, 2006, 26 (11), 1644-1645

ISSN: 0254-1793

Analyte: chromium;
chromium [7440-47-3] - detmn of, in pharmaceuticals, by AAS and microwave digestion

Matrix: pharmaceutical preparations;
pharmaceutical preparations - detmn of chromium in vacant, by AAS and microwave digestion

Technique: digestion, microwave
spectrometry, atomic-absorption (AAS)

Language: Chinese

Abstract: To establish a graphite furnace atom absorbance spectrometry (AAS) method for determination of Cr content in vacant capsules. Applying microwave digestion system to deteriorate sample. Use graphite furnace AAS method to determine Cr content. The linear relationship between the absorbance and the concentration of Cr was in the range of 0–10.0 μg L−1 (r = 0.9998) with detection limit of 0.39 μg L−1. The determination limit was 1.84 μg L−1. The specific concentration (sensitivity) was 0.0587 μg L−1. The average recovery was 98.9% (n = 9). This method is found to be sensitive and accurate and was useful in control the content of Cr in vacant capsules.

 

 

 

 

 

Determination of copper and nickel in vegetable oils by direct sampling graphite furnace atomic absorption spectrometry

Mariela N. Matos Reyesa and Reinaldo C. Campos , a,

aDepartment of Chemistry, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marques de São Vicente 225, 22453-900 Rio de Janeiro, RJ, Brazil

Received 15 September 2005;  revised 6 January 2006;  accepted 18 May 2006.  Available online 7 July 2006.

Abstract

The quality of food products has been receiving great attention due to its influence on human nutrition and health. In this sense, the determination of trace metals in foods has turned an important field on food analysis. Concerning vegetable oils, its metal trace composition is an important criterion for the assessment of their quality once it is known that trace metals affect their rate of oxidation, influencing freshness, keeping properties as well as storage. In the present work an analytical method which enables the direct determination of Cu and Ni in vegetable oils by graphite furnace atomic absorption spectrometry (GFAAS), using a “solid” sample strategy is presented: in nature, samples are directly weighed on the graphite platform boat and inserted in the graphite tube. An adequate temperature program permitted the calibration by external aqueous analytical curves. Good concordance between the proposed procedure and EPA procedures was found in the analysis of real samples. Limits of detection of 0.001 and 0.002 μg g−1 were found for Cu and Ni, respectively, in the original samples, and they were comfortably below the concentrations found.

 

 

 

 

 

 

 

Mercury determination in petroleum products by electrothermal atomic absorption spectrometry after in situ preconcentration using multiple injections.

Analyte: mercury;
mercury [7439-97-6] - detmn of, in naphtha, by AAS

Matrix: naphtha;
naphtha [8030-30-6] - detmn of mercury in, by AAS

Technique: spectrometry, atomic-absorption (AAS)

Language: English

Abstract: A simple method for mercury determination in petroleum fractions (e.g. naphtha) using electrothermal atomic absorption spectrometry (ETAAS) associated with multiple injection technique for direct preconcentration in the graphite tube has been developed. Oil-in-water micro-emulsions (three-component solutions) were prepared using a mixture of sample, propan-1-ol and HNO3. No additional sample pretreatment was required. In the procedure, three successive 30 μL micro-emulsion aliquots are delivered to the graphite tube. The pyrolysis and atomization temperatures were set to 400 °C and 1400 °C, respectively. The calibration curves showed a linear response up to analyte concentrations of 150 μg L−1 with a correlation coefficient of 0.993. The precision calculated from fifteen consecutive measurements and defined as the coefficient of variation of solutions containing 5.0 and 30 μg L−1 of Hg were 6.4% and 4.7%, respectively. The limit of detection (LOD), defined as the Hg concentration that gives a response equivalent to three times the standard deviation (s) of the blank (n = 10), was found to be 0.78 μg L−1. The proposed procedure was used for mercury determination in naphtha feeds processed in Braskem S.A. (Salvador, Bahia, Brazil).

 

 

 

 

 

 

 

Sensitive determination of lead by flame atomic absorption spectrometry improved with branched capillary as hydride generator and without phase separation.

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Authors: Tan, Q.; Wu, P.; Wu, L.; Hou, X. D.*; houxd@scu.edu.cn; Key Lab. Green Chem. & Technol. Ministry Educ. Coll. Chem., Chengdu, Sichuan 610064, China

Source: Mikrochimica Acta, 2006, 155 (3-4), 441-445

ISSN: 0026-3672

Analyte: lead;
lead [7439-92-1] - detmn of, in geological materials and paint, by AAS and sample prep., optimisation and validation of

Matrix: geological materials; paints;
geological materials - detmn of lead in, by AAS and sample prep., optimisation and validation of
paints - detmn of lead in, by AAS and sample prep., optimisation and validation of

Technique: sample preparation (sample prep.)
spectrometry, atomic-absorption (AAS) - branched capillary for hydride generation in, in detmn of lead, in geological materials and paint, optimisation and validation of

Language: English

Abstract: The sensitivity of traditional flame atomic absorption spectrometry (FAAS) is low for the determination of lead. Therefore, a simple branched capillary was used for hydride generation with air-acetylene FAAS determination of lead in geochemical samples and paint. Using a Y-shaped connector, the sampling capillary of a traditional FAAS instrument was branched, with one branch for introducing the reductant solution, KBH4, and the other for the sample solution, Pb4+. The KBH4 solution and the Pb4+ solution were then merged and mixed inside the reaction capillary and thereafter inside the nebulizer for generating the lead hydride, which, together with the liquid fine droplets, was directly brought into the air-acetylene flame for atomization without gas/liquid separation. The experimental conditions were optimized for best signal-to-noise ratio (S/N). A calibration curve was obtained with a linear dynamic range of up to 1.0 mg L−1 and a correlation coefficient of 0.9997. The limit of detection (LOD) for lead was found to be 0.004 mg L−1, 10 times better than that of traditional FAAS and slightly better than or equivalent to that of the sophisticated inductively coupled plasma atomic emission spectrometry (ICP-AES). The improvement in sensitivity and the LOD for lead largely owe to the altered atomization mechanism via hydride generation. The proposed method was successfully applied to the determination of lead in Geochemical Standard Deposit (GSD) samples and paint samples.

Determination of trace lead in beverages by hydride generation - atomic absorption spectrometry after enrichment.

Authors: Chen, X. Z.; Liang, J.; chenxueze2003@163.com; Res. Inst. Appl. Chem. Central-South Forestry Univ., Zhuzhou 412006, China

Source: Fenxi Ceshi Xuebao, 2006, 25 (5), 118-120

ISSN: 1004-4957

Analyte: lead;
lead [7439-92-1] - detmn of, in beverages, by AAS

Matrix: beverages;
beverages - detmn of lead in, by AAS

Technique: spectrometry, atomic-absorption (AAS)

Language: Chinese

Abstract: A novel method was developed for the determination of trace lead in beverages by hydride generation - atomic absorption spectrometry (HG-AAS). The complex, formed by lead with APDC, was trapped into the aluminium oxide on a membrane filter. After filtering, the aluminium oxide was washed out with 0.1 mol/L HCl. The aluminium oxide slurry was then analysed by HG-AAS. The characteristic mass of Pb was 0.01 ng/1%. The relative standard deviation range was 4.0%-7.0% (n = 6), and the recovery of Maidong and Tianbao beverage were 98%, 104%. The results obtained were satisfactory.

 

 

 

 

 

 

 

 

Study of the chemical properties of gravitation dust sediments.

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Authors: Remeteiova, D.; Smincakova, E.; Florian, K.; dagmar.remeteiova@tuke.sk; Dept. Chem.. Fac. Metallurgy Tech. Univ. Kosice, 042 00 Kosice, Slovakia

Source: Mikrochimica Acta, 2006, 156 (1-2), 109-113

ISSN: 0026-3672

Analyte: cadmium; copper; elements; lead; nickel; zinc;
cadmium [7440-43-9]
copper [7440-50-8]
elements - detmn of, in dust, by AAS and extraction
lead [7439-92-1]
nickel [7440-02-0]
zinc [7440-66-6]

Matrix: dust;
dust - detmn of elements in, by AAS and extraction

Technique: extraction
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: The chemical properties of the gravitation dust sediment particles depend on their source. Two samples of the gravitation dust sediment have been investigated. The first sample, collected in locality Kosice-Vel'ka Ida, near by U.S. Steel Ltd. (a metallurgy plant), represents the metallurgy industry pollutants. The second sample, collected in Kosice city, represents the urban dust. Dust sediments particles create a non-homogeneous system. For this reason, the particles size distribution has been studied. On the base of the obtained experimental results one sample was divided into two approximately same mass fractions. The mineralogical composition of the dust particles matrix was determined by DTA, XRD, and SEM-EDS analyses. The total content of the chosen trace risk elements was defined by various AAS methods. The physical-chemical forms of elements in the dust sediment are characterised by different mobility and biotoxicity. The single-step extraction was used for the isolation of various element forms. 1 mol dm−3 NH4NO3, 0.05 mol dm−3 EDTA, and 2 mol dm−3 HNO3 were used as extraction reagents. The content of the elements in extracts was determined by the FAAS method.

 

 

Study on the determination and blurred classification of metal elements content in Danshen etc 11 kinds of Chinese traditional medicine.

Authors: Dong, S. F.; Liu, J.; Dong, H. B.; Zhang, W. P.; Liu, J. H.; Jilin Military Med. Coll. Fourth Military Med. Univ., Jilin 132013, China

Source: Spectroscopy and Spectral Analysis (Guangpuxue Yu Guangpu Fenxi) , 2006, 26 (11), 2150-2153

ISSN: 1000-0593

Analyte: calcium; chromium; copper; iron; magnesium; manganese; metals; potassium; zinc;
calcium [7440-70-2]
chromium [7440-47-3]
copper [7440-50-8]
iron [7439-89-6]
magnesium [7439-95-4]
manganese [7439-96-5]
metals - detmn of, in Chinese traditional medicines, by AAS, in study of relationship with therapeutic effect
potassium [7440-09-7]
zinc [7440-66-6]

Matrix: Chinese traditional medicines;
Chinese traditional medicines - detmn of metals in, by AAS, in study of relationship with therapeutic effect

Technique: spectrometry, atomic-absorption (AAS)

Language: Chinese

Abstract: The contents of potassium, calcium, magnesium, iron, manganese, copper, zinc and chromium in 11 kinds of Chinese traditional medicines such as Danshen, Gouqizi, Dangshen, Jiaogulan, Dongchonxiacao, Huangqi, Rougui, Xixin, Longdancao, Shazhuyu and Duzhong were determined by flame atomic absorption spectrophotometry, in order to study the interrelation between metal elements and the therapeutic effect through the method of blurred classification. The results showed that the cluster in 7 kinds of medicines was similar when the relative coefficient was 0.50; cluster in 3 kinds of medicines was similar when the relative coefficient was 0.65; the cluster in 2 kinds of medicines was similar when the relative coefficient was 0.75. When the contents of metal elements are rich and the relative coefficient is considerably great, their therapeutic effect is similar. This suggests that trace elements have much to do with the therapeutic effect. The study provides new useful data for research on new types of medicines, and developing a new method for evaluating quality of Chinese traditional medicines.

Evaluation of four sample treatments for determination of platinum in automotive catalytic converters by graphite furnace atomic absorption spectrometry.

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Authors: Puig, A. I.; Alvarado, J. I.*; jalvar@usb.ve; Lab. Espectroscopia Atomica, Dept. Quim. Univ. Simon Bolivar, Caracas 1080-A, Venezuela

Source: Spectrochimica Acta Part B: Atomic Spectroscopy, 2006, 61B (9), 1050-1053

ISSN: 0584-8547

Analyte: platinum;
platinum [7440-06-4] - detmn of, in catalytic exhaust converters, by AAS and sample prep.

Matrix: catalytic exhaust converters;
catalytic exhaust converters - detmn of platinum in, by AAS and sample prep.

Technique: sample preparation (sample prep.) - comparison of techniques for, in detmn of platinum, in catalytic exhaust converters
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: Conventional and microwave assisted digestion, both using aqua regia, alkaline fusion with lithium metaborate and aqueous slurries were evaluated as sample treatments for determination of Pt in automotive catalytic converters by Graphite Furnace Atomic Absorption Spectrometry (GF-AAS). Determination of platinum by GF-AAS in samples of the catalytic converter's substrates, prepared by the four methods described, indicates that the highest platinum concentration i.e. maximum Pt extraction in the range of 748 ±15–998 ± 10 μg mL−1, is obtained for samples dissolved by alkaline fusion, closely followed by analysis of aqueous plus Triton X-100 slurries 708 ± 14–958 ± 10 μg mL−1 while neither one of the acid digestion procedures achieved total dissolution of the samples. Slurry analysis is thus shown to be a viable alternative and is recommended, based on its speed and ease of implementation. Aqueous standards calibration curves and the standard addition methods were also compared. The results showed that no appreciable matrix effects are present, regardless of the sample preparation procedure used. Precision of the measurements, expressed as percentage relative standard deviation, ranged between 2.5 to 4.9%. Accuracy of the results was assessed by recovery tests which rendered values between 98.9 and 100.9%.

Distribution of lead in urban roadway grit and its association with elevated steel structures.

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Authors: Weiss, A. L.; Caravanos, J.; Blaise, M. J.; Jaeger, R. J.; aweiss@envmed.com Environ. Med. Inc., Westwood, NJ 07675, USA

Source: Chemosphere, 2006, 65 (10), 1762-1771

ISSN: 0045-6535

Analyte: lead;
lead [7439-92-1] - detmn of, in soil, by AAS, sample prep. and sampling

Matrix: soil;
soil - detmn of lead in roadway, by AAS, sample prep. and sampling

Technique: sample preparation (sample prep.)
sampling
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: In an effort to determine the source of exterior lead contamination, we investigated the concentration of lead in roadway grit along major thoroughfares in New York City and in certain areas under elevated steel structures supporting elevated rails. Such structures represent only one source of lead in roadway grit. While data revealed that the median lead concentration in roadway grit did not exceed the standard for a lead hazard in bare residential soil in any borough, the limit of 400 μg/g was exceeded 22%, 18%, 10.5%, and 7.7% of the time in Manhattan, Brooklyn, The Bronx, and Queens, respectively. The second part of the study revealed the presence of high concentrations of lead in roadway grit directly under elevated steel structures. The differences in the concentration of lead in roadway grit under steel structures in comparison to areas in NYC not near elevated rails was statistically significant. Of the eight sites studied from 225 total samples, the median roadway grit lead level was 340 ppm, while the level under steel structures was 1480 ppm. Preliminary efforts to determine particle size distribution revealed that 84% of the particles were in the range of 125–500 μm, but the highest concentration of lead was in the smallest fraction analyzed (<63 μm). Lead contamination of roadway grit from restoration of elevated painted steel structures is a public health problem as these lead particulates get re-suspended in the ambient environment and are wafted and tracked into residences.

Determination of copper and nickel in vegetable oils by direct sampling graphite furnace atomic absorption spectrometry.

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Authors: Matos Reyes, M. N.; Campos, R. C.*; rccampos@rdc.puc-rio.br; Dept. Chem. Pontificia Univ. Catolica Rio de Janeiro, 22453-900 Rio de Janeiro, Brazil

Source: Talanta, 2006, 70 (5), 929-932

ISSN: 0039-9140

Analyte: copper; nickel;
copper [7440-50-8] - detmn of, in vegetable oils, by AAS, optimisation and validation of
nickel [7440-02-0] - detmn of, in vegetable oils, by AAS, optimisation and validation of

Matrix: vegetable oils;
vegetable oils - detmn of copper and nickel in, by AAS, optimisation and validation of

Technique: spectrometry, atomic-absorption (AAS)

Language: English

Abstract: The quality of food products has been receiving great attention due to its influence on human nutrition and health. In this sense, the determination of trace metals in foods has turned an important field on food analysis. Concerning vegetable oils, its metal trace composition is an important criterion for the assessment of their quality once it is known that trace metals affect their rate of oxidation, influencing freshness, keeping properties as well as storage. In the present work an analytical method which enables the direct determination of Cu and Ni in vegetable oils by graphite furnace atomic absorption spectrometry (GFAAS), using a “solid” sample strategy is presented: in nature, samples are directly weighed on the graphite platform boat and inserted in the graphite tube. An adequate temperature program permitted the calibration by external aqueous analytical curves. Good concordance between the proposed procedure and EPA procedures was found in the analysis of real samples. Limits of detection of 0.001 and 0.002 μg g−1 were found for Cu and Ni, respectively, in the original samples, and they were comfortably below the concentrations found.

P and trace metal contents in biomaterials, soils, sediments and plants in colony of red-footed booby (Sula sula) in the Dongdao Island of South China Sea.

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Authors: Liu, X. D.; Zhao, S. P.; Sun, L. G.*; Yin, X. B.; Xie, Z. Q.; Luo, H. H.; Wang, Y. H.; slg@ustc.edu.cn; Inst. Polar Environ. Univ. Sci. & Technol. China, Anhui 230026, China

Source: Chemosphere, 2006, 65 (4), 707-715

ISSN: 0045-6535

Analyte: cadmium; copper; lead; mercury; metals; phosphorus; zinc;
cadmium [7440-43-9]
copper [7440-50-8]
lead [7439-92-1]
mercury [7439-97-6]
metals - detmn of, in biological materials and environmental materials, by AAS, AFS and sample prep.
phosphorus [7723-14-0] - detmn of, in biological materials and environmental materials, by sample prep. and spectrophotometry
zinc [7440-66-6]

Matrix: biological materials; bone; eggshell; environmental materials; faeces; feathers; plants; sediments; soil;
biological materials - detmn of metals and phosphorus in seabird, by AAS, AFS, sample prep. and spectrophotometry
bone
eggshell
environmental materials - detmn of metals and phosphorus in, by AAS, AFS, sample prep. and spectrophotometry
faeces
feathers
plants
sediments
soil

Technique: sample preparation (sample prep.)
spectrometry, atomic-absorption (AAS)
spectrometry, atomic-fluorescence (AFS)
spectrophotometry, absorption, ultra-violet - visible (spectrophotometry)

Language: English

Abstract: Concentrations of P and trace metals Zn, Cu, Cd, Pb and Hg in the faeces, bones, eggshells and feathers of seabirds and in the plants, soils and sediments with and without seabird influence on Dongdao Island, South China Sea, were determined and analyzed. Among the seabird biomaterials, the levels of P, Zn, Cu and Cd are the highest in the droppings and several times those in other materials; the Hg concentration is the highest in the feathers; and the Pb content is comparable among these biomaterials. These marked differences indicate different intake-bioaccumulation-elimination pathways for different trace metals. The levels of P, Zn, Cu, Cd and Hg in the plant, soil and sediment samples with the influence of seabird droppings are significantly higher than those in the samples without, and they are significantly correlated with each other. Thus, P, Zn, Cu, Cd and Hg are very likely to have a common source—predominantly bird guano—and the faeces of red-footed booby is an important vector for the flux of nutrient phosphorus and trace metals Zn, Cu, Cd and Hg from marine to island ecosystems on Dongdao Island.

Speciation analysis of inorganic vanadium (V(IV)/V(V)) by graphite furnace atomic absorption spectrometry following ion-exchange separation.

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Authors: Zhao, L.; Zhu, X. S.*; Feng, K.; Wang, B. S.; xszhu@yzu.edu.cn; Key Lab. Environ. Mater. and Environ. Eng. Jiangsu Province., Coll. Chem. and Chem. Eng. Yangzhou Univ., Yangzhou 225002, China

Source: International Journal of Environmental Analytical Chemistry, 2006, 86 (12), 931-939

ISSN: 0306-7319

Analyte: vanadium; vanadium ion (V4+); vanadium ion (V5+);
vanadium [7440-62-2] - speciation of, in soil and water, by AAS, ion-exchange chromatography and sample prep., optimisation of
vanadium ion (V4+) [22541-76-0]
vanadium ion (V5+) [22537-31-1]

Matrix: soil; water;
soil - speciation of vanadium in, by AAS, ion-exchange chromatography and sample prep., optimisation of
water - speciation of vanadium in, by AAS, ion-exchange chromatography and sample prep., optimisation of

Technique: chromatography, ion-exchange - methylene blue as chelating reagent for, in speciation of vanadium, in soil and water, optimisation of
sample preparation (sample prep.)
spectrometry, atomic-absorption (AAS)

Language: English

Abstract: A sensitive and simple method of ion-exchange resin separation and graphite-furnace atomic absorption spectrometry (GFAAS) detection was proposed for the determination of inorganic vanadium species. Methylene Blue (MB) was used as a chelating agent of V(V) for ion-exchange separation. The complex of V(V) and MB could be trapped by ion-exchange resin at pH 3.0 and eluted by 1.0 mol L−1 NaOH. The vanadium species was determined subsequently by GFAAS. The concentration of V(IV) was calculated by subtracting the V(V) concentration from the total concentration of vanadium. Under the optimized experimental conditions, the detection limit of V(V) is 0.48 μg L−1 with RSD of 2.6% (n = 5, c = 2.0 μg L−1). In order to verify the accuracy of the method, a certified reference soil sample was analyzed, and the results obtained were in good agreement with the certified values. The range of recovery for V(IV) and V(V) was 97.8–99.3% and 101.7–103.6%, respectively. The proposed method was applied to the speciation analysis of vanadium in lake-water samples.

Study on correlation between trace elements determined by AAS with microwave digestion in Kudzu-vine roots and quality of vegetation soils.

Authors: Ye, Q.*; sryq6333@163.com; Dept. Chem. Shangrao Normal Coll., Shangrao 334001, China

Source: Yankuang Ceshi (Rock and Mineral Analysis), 2006, 25 (4), 387-388

ISSN: 0254-5357

Analyte: calcium; copper; elements; iron; magnesium; manganese; zinc;
calcium [7440-70-2]
copper [7440-50-8]
elements - detmn of, in kudzu, by AAS and microwave digestion
iron [7439-89-6]
magnesium [7439-95-4]
manganese [7439-96-5]
zinc [7440-66-6]

Matrix: kudzu;
kudzu - detmn of elements in root of, by AAS and microwave digestion

Technique: digestion, microwave
spectrometry, atomic-absorption (AAS)

Language: Chinese

Abstract: A method for the determination of trace elements including Cu, Fe, Zn, Mn, Ca and Mg in Kudzu-vine roots by AAS with microwave digestion has been developed. The analytical results provided by the method show that 6 elements mentioned above in Kudzu-vine roots are in higher content, especially for Fe, Ca and Mg. The content of trace elements in Kudzu-vine roots planted in yellow soils is higher than that planted in black soils. The experimental results will provide the scientific basis and useful information for further developing excellent variety of Kudzu-vine roots and balancing fertilization.

 

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determination of metals