Determination of Hexavalent Chromium in Plastic Particles by Automatic Flow Injection Analyzer
Hexavalent chromium[Cr(Ⅵ)]is a harmful element,and its determination in plastic particles can be more effectively conducted using a fully automated flow injection analysis method.This method is based on the reaction between diphenylcarbazide and hexavalent chromium in an acidic medium,which produces an amaranth product that can be measured at a wavelength of 550 nm.Compared with the traditional UV-VIS spectrophotometry,the automatic flow injection analyzer eliminates the manual color development process,and offers high automation,rapidity,sensitivity and efficiency.The color presented by the plastic particles after extraction can interfere with the test results,and C18 columns can be used as the preferred material for decolorization,which has a good adsorption effect on matrix color without absorption of hexavalent chromium.Based on the experimental results,the method is suitable for the determination of hexavalent chromium content in plastic particles.
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