Determination of Alkyl Mercury Leaching Toxicity in Solid Waste by Purge and Trap/Gas Chromatography Cold Atomic Fluorescence Spectrometry
An analytical method for the use of purge trap/GC-atomic fluorescence spectrometer for the determination of alkyl mercury in solid waste extract was established.Solid waste samples by sulfate nitrate-flip oscillation method,methyl chloride/water extraction and reverse extraction,tetrapropyl sodium boride derivative,into the automatic alkyl mercury analyzer to de-termine methyl mercury and ethyl mercury.The results showed that the detection limit of both methyl mercury and ethyl mer-cury was 0.9 ng/L.Precision analysis of blank samples,the relative standard deviation of methyl mercury and ethyl mercury was 5.2%～8.4%and 2.9%～6.2%,respectively.According to the accuracy of solid waste,the recovery rate of methyl mercury and ethyl mercury was 84.0%～90.0%and 81.0%～85.1%respectively.This method is simple to operate,with low detection limit and high accuracy,and is suitable for the determination of alkyl mercury in large quantities of solid waste leaching solution.
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