Corrosion Inhibitors
Amine based corrosion inhibitors are quantified using fluorimetry after isolation and concentration by solid phase extraction. The solid phase extraction isolates the entire gamut of amine based corrosion inhibitor in the sample; so, it is not specific for any particular component of the formulation nor does it distinguish between different inhibitors. This technique affords the highest sensitivity and specificity. A response factor must be generated for each formulation.
The SPE is true class isolation. Quaternaries, imidazolines, amide-amines and most nitrogen based corrosion inhibitors can be efficiently isolated from water samples. Aqueous extraction of hydrocarbons can yield SPE isolates that respond in this test, mostly due to the less hydrophobic homologues. This may be of use to pipelines and researchers.
Many corrosion inhibitor actives can be quantified at ppb levels; so, most formulations can be reported at low ppm levels.
Price structure for corrosion inhibitors weighs heavily on the number of samples contracted to receive.