地热水中多种甲基硫代砷酸盐的同时定量测定  

Simultaneous Quantitative Analysis of Multiple Methylthiolated Arsenates in Geothermal Water

作　　者：郭清海[1,2] 孟越 严克涛 Guo Qinghai;Meng Yue;Yan Ketao(Key Laboratory of Deep Geothermal Resources,MNR,China University of Geosciences,Wuhan 430078,China;School of Environmental Studies,China University of Geosciences,Wuhan 430078,China)

机构地区：[1]中国地质大学自然资源部深部地热资源重点实验室,湖北武汉430078 [2]中国地质大学环境学院,湖北武汉430078

出　　处：《地球科学》2023年第3期1138-1145,共8页Earth Science

基　　金：国家自然科学基金项目(Nos.42077278,41861134028)。

摘　　要：地热水中的砷含量常远超过其他类型天然水体,其形态分析具有重要环境地球化学意义;甲基硫代砷酸盐在特定水环境条件下可能成为砷的一种不可忽视的形态,但其环境地球化学研究几为空白.本研究合成了甲基硫代砷酸盐标准,建立了可同时定量测试天然水中多种甲基硫代砷酸盐(包括一甲基一硫代砷酸盐、一甲基二硫代砷酸盐、一甲基三硫代砷酸盐、二甲基一硫代砷酸盐、二甲基二硫代砷酸盐)及砷的其他常见形态的离子色谱-电感耦合等离子体质谱联用系统(IC-ICP-MS)及其方法,并分析了典型地热水样品中砷的形态分布,可为今后不同类型水环境中甲基硫代砷酸盐的地球化学研究奠定分析方法基础.Geothermal waters generally have far higher arsenic concentrations than other types of natural waters,and analysis of arsenic speciation in geothermal waters is of great environmental geochemical significance.Methylthiolated arsenates are non-negligible arsenic species under special aqueous environmental conditions,while little environmental geochemical studies of methylthiolated arsenates have been done so far.In this work,various methylthiolated arsenates standards were synthesized,and an ion chromatography coupled to inductively coupled plasma-mass spectrometry,capable of determining concentrations of common arsenic species as well as methylthiolated arsenates in natural waters including monomethylmonothioarsenate(MMMTA),monomethyldithioarsenate(MMDTA),monomethyltrithioarsenate(MMTTA),dimethylmonothioarsenate(DMMTA),and dimethyldithioarsenate(DMDTA),was set up.Furthermore,the arsenic speciation in a typical geothermal water sample was analyzed.The efforts made in this study produced an analytical method basis for future geochemical studies of methylthiolated arsenates in aqueous environments.

关 键 词：地热水 甲基硫代砷酸盐 定量分析 IC-ICP-MS 地下水地球化学 

分 类 号：P314[天文地球—固体地球物理学]