v.5 n.5 August
Parana Journal of Science and Education. v.5, n.5, August (2019).
Summary
Articles
Vasily Konstantinovich Novikov, Victoria Alexandrovna Kuzmichova
Parana J. Sci. Educ., v.5, n.5, (1-7), August 10, 2019.
DOI: doi.org/10.5281/zenodo.3870748
Abstract
The World Ocean is the source of enormous wealth used by the mankind in its interests. It forms the weather on the planet, enables passengers and cargos transportation by vessels of water transport (WT). Along with this, the human vigorous activities on its development/use cause significant harm to it through pollution including that at operation of WT ships, which account for about 12% of all pollutants of the water environment. The wastewater released by ships carrying passengers is also dangerous pollutants, since this sewage is released without any treatment, causing the proliferation of algae and depleting the oxygen of the waters. There are also hydrocarbons that make the water get greasy, making marine life almost impossible. If it fools anyone who thinks the pollution caused by them to in marine life. Giants also emit substances harmful to human life, such as sulfate, which is highly dangerous and can be lodged in important organs such as the lungs. With regard to human health, the populations are most affected by coastal areas, mainly residents of port cities, where there is constant traffic of maritime vessels. From the point of view of systematic approach to available data analysis, the article describes the current state of pollution of the water environment by wastes being formed because of the water transport vessels operation. The existing structure of the system of shipboard wastes handling is presented as well as the used techniques and technical means. Their disadvantages are shown. Possible directions of improvement of the existing system of ship wastes handling are proposed, though the further special studies are needed.
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Do cooking process influences the metal contents in crab and prawn?
Supurna Lahiri, Subhra Bikash Bhattacharyya, Prosenjit Pramanick, Ricardo Gobato, Sufia Zaman, Abhijit Mitra
Parana J. Sci. Educ., v.5, n.5, (8-14), August 10, 2019.
DOI: doi.org/10.5281/zenodo.3870756
Abstract
Two common shellfish species Penaeus monodon (tiger prawn) and Scylla olivacea (orange mud crab) were analysed for Zn, Cu, Pb and Cd. For each species, two composite samples were prepared for metal analyses, whose levels in raw and cooked (boiled, steamed, fried and curry) samples were determined by Perkin-Elmer Sciex ELAN 5000 ICP mass spectrometer and expressed as ppm dry weight. The heavy metal content in all shellfish species decreased on cooking (except for lead in shellfish curry). In shellfish curry the concentration of Pb increased significantly. In conclusion it can be advocated that the cooking process greatly influences the metal concentrations in the selected shellfish species.
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