水浴消解-冷原子荧光法测定植物总汞的消解体系选择  

Selection A Water Bath-Based Digestion System Combined with Cold Vapor Atomic Fluorescence Spectrometry to Determine Total Mercury in Plants

作　　者：王璐 杨胜香[1] 李仲根 李欣宇 陈功锡 WANG Lu;YANG Sheng-xiang;LI Zhong-gen;LI Xin-yu;CHEN Gong-xi(College of Resources and Environment,Zunyi Normal University,Zunyi Guizhou 563006,China;College of Biology and Environmental Science,Jishou University,Jishou Hunan 416000,China;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]遵义师范学院资源与环境学院,贵州遵义563006 [2]吉首大学生物资源与环境科学学院,湖南吉首416000 [3]中国科学院地球化学研究所,环境地球化学国家重点实验室,贵阳550081 [4]中国科学院大学,北京100049

出　　处：《矿物岩石地球化学通报》2022年第1期151-155,共5页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(41967020)。

摘　　要：为优选简便快捷和测试可靠的植物总汞湿法消解方法,本文以植物标准物质GSB-11(柑橘叶)、NIST-1515(苹果叶)为研究对象,比较了5种水浴酸消解方法以及消解后加入和不加入Br Cl、NH_(2)OH·HCl对植物总汞测定的回收率差异。结果表明,采用逆王水(HCl∶HNO_(3)体积比1∶3)95℃水浴3 h消解植物样品,消解后不加入Br Cl、NH_(2)OH·HCl测定植物总汞含量的方法最优,能实现大批量样品消解,一次消解约100个;操作简单快速,无需调配添加Br Cl、NH_(2)OH·HCl以及静置消解液等;测定结果准确,总汞回收率为99.6%~101.5%,汞加标回收率为98.1%。逆王水水浴消解法是一种高效、简便、准确可靠的植物总汞测定方法,能满足低汞含量植物样品分析要求。Choosing a simple,fast and reliable wet digestion method is the key to determine the total mercury in plants.In this study,GSB-11(citrus leaf)and NIST-1515(apple leaf)were used as standard materials,and the recovery rates of their total mercury were compared with five water-bath acid digestion methods with and without the BrCl,NH_(2)OH·HCl treatment.The results showed that the optimization procedure is as follows,the plant samples were digested with inverse aqua regia(HCl∶HNO_(3) volume ratio 1∶3)in a 95℃water bath for 3 h,and no Br Cl and NH_(2)OH·HCl were added after the digestion.The advantages of this method are as follows:1.It can digest a large number of samples,e.g.100 samples at a time.2.The operation process is simple and quick,without adding BrCl,NH_(2)OH·HCl,and standing digestion so-lution.3.The measurement results are accurate,with the total mercury recovery rates being from 99.6%to 101.5%,and the mercury recovery rate for the mercury-spiked standard substance being 98.1%.In summary,the inverse aqua regia water bath digestion is an efficient,simple,accurate and reliable method for the determination of total plant mercury,which meets the analysis requirements of low mercury content plant samples.

关 键 词：植物 总汞 逆王水 水浴 冷原子荧光法 

分 类 号：X142[环境科学与工程—环境科学]