溶剂萃取-水相乙基化衍生GC-CVAFS联用测定苔藓样品中的甲基汞

Determination of Methylmercury in Moss by Ethylation-Gas Chromatography-Cold Vapor Atomic Fluorescence Spectrometry with Solvent Extraction

应用碱消解和溶剂萃取技术 ,将苔藓样品中的甲基汞萃取出来并预富集至水相 ,而后进行乙基化反应 ,最后用气相色谱 -冷原子荧光联用系统分离测定。实验结果显示 :方法检出限0.003ng/g,样品加标回收率为83 %～120 % ,精密度RSD不超过8.6 %。该方法还可以用于其它不同种类的植物和生物样品 (例如 :血液、人发等 )

An alkaline digestion and a solvent extraction technique were developed for the extraction of methylmercury in moss by aqueous-phase ethylation reaction with sodiumtetraethylborate,precollection onto a Tenax at room temperature,gas chromatographic separation and cold vapor atomic fluorescence spectrometric detection.The detection limit of this method was below0.003ng/g,and matrix spike recoveries of83%～120%were obtained with relative standard deviations≤8.6%for all samples analyzed.This method can alˉso be used to analyze trace methylmercury contents in other biological samples.