Abstract：Methylmercury (CH3Hg) is the accumulation of heavy metals pollutants who is the main form of mercury. while is the toxicity of other toxic mercury compounds of several hundredfold. It can be enriched through the role of savings in the body and damage the nervous system. Wu is the water of methylmercury chronic poisoning disease. This experiments use bighead carp, Macrobrachium nipponense and blue crab as an example to the establishment of a benzene extraction and L-cysteine filter paper recycling benzene renounce and then GC-MS instrument Determination,and the initial establishment of the GC-NCI-MS. We also use this method to detect blue crab, crayfish and other aquatic products in the methylmercury content. After samples of benzene extraction, the HP-5MS column separation, SIM-detector test, to preserve the time and quality than could be qualitative, quantitative peak area, the study showed that methylmercury standard solution in the 0.1 μg/mL -2.0 μg/mL within the framework of a good linear relationship, the relationship between the Y=124283.879X-1728.8744, a correlation coefficient of 0.99911. Samples of the recovery of between 92% -103%, this method significantly the accuracy of the benzene in the conventional extraction methods, and sulfhydryl enrichment of cotton compared to avoid sulphuric acid and acetic anhydride, and aslo precursor chemicals in use. This method is accurate and reliable, simple, easy to promote, sensitive, reproducible and low detection limits and strengths to meet the methyl mercury residues in aquatic products in the testing requirements.
Key words: RP-extraction; GC-NCI-MS; aquatic products; methylmercury
