测汞仪直接测定并评价鲫鱼组织中汞含量

Determination and evaluation of mercury content in crucians tissue by direct mercury analyzer

目的:建立用测汞仪直接测定并评价南京地区超市和农贸市场所售鲫鱼组织中的汞含量。方法:用直接测汞仪,分别测定鱼皮、鱼脑、鱼肉及鱼籽组织中的汞含量。结果:鲫鱼组织中的汞含量呈如下规律:鱼脑>鱼皮>鱼肉>鱼籽;鱼龄越大,体内富集的汞越多。对汞含量在0.12 ng～20.00 ng范围内呈线性关系,相关系数r=0.9999,最低检出限为0.04 ng。样品加标回收率为95.8%～104.4%,RSD为1.63%～2.92%。本方法与国标法无显著性差异。结论:本方法精密度和准确度较好,测汞时无需进行样品前处理,具有取样量少,简单、准确和高效等特点,能满足样品检测的要求。

Objective：A simple method was established to measure and evaluate the mercury content in crucians tissue collected from supermarkets and trade markets in Nanjing by direct mercury analyzer,respectively.Methods： Determination of mercury content in the skin,brain,muscle and roe of fish were finished by direct mercury analyzer.Results： The mercury content in crucian tissue was evaluated as below： brainskinmuscleroe.The results showed the older the fish were,the higher mercury content would be in the body of fish.The perfect linear range of the content value varied from 0.12 ng to 20.00 ng with a relation coefficient of 0.9999.The lowest detection limit was 0.04 ng.The recoveries were between 95.8%～104.4%,and the relative standard deviations were between 1.63%～2.92%.The results also indicated the little statistical difference between the new method and the current standard method.Conclusion： The less sample was needed for direct determination by mercury analyzer without any pretreatment.The method was simple,accurate and rapid enough for Hg determination in fish.