地质学报2025，Vol.99Issue(4)：1109-1119,11.DOI:10.19762/j.cnki.dizhixuebao.2023080
地热水环境中的甲基硫代砷:形成路径与迁移特征
Methylthiolated arsenic species in geothermal water environments:Formation paths and transport characteristics
摘要
Abstract
Geothermal arsenic is an important source of arsenic in the environment,and methylthiolated arsenates may constitute a non-negligible fraction of arsenic species in geothermal waters.Compared to non-thiolated and/or non-methylated arsenic species,methylthiolated arsenic species are generally characterized by higher toxicity and stronger mobility.However,their occurrence in natural water environments,including diverse geothermal settings,remains relatively understudied.Two theoretical formation pathways exist for methylthiolated arsenic species.The first,involving methylation of arsenite followed by thioltion,has been well acknowledged.In contrast,the second pathway,where arsenite undergoes thioltion prior to methylation,lacks validation primarily due to the absence of an effective quantitative analytical method for thioarsenites.Nevertheless,the detection of methylthiolated arsenates in neutral to alkaline hot springs,which are fed by rapidly replenished high-temperature shallow reservoir fluids,indicates that the second pathway may be more plausible in these cases.Once formed in a hot spring area,methylthiolated arsenates tend to show a lower adsorption affinity to hot spring sediments that are capable of strongly adsorbing other arsenic species.Consequently,they can undergo long-distance transport via rivers traversing the area,participating in a larger-scale arsenic geochemical cycle.Further research into the transport and fate of methylthiolated arsenic species in geothermal areas,as well as their environmental effects at regional and global scales,is crucial and represents a key research direction in arsenic environmental geochemistry.关键词
地热水环境/砷/甲基硫代砷/形成机制/环境效应Key words
geothermal water environment/arsenic/methylthiolated arsenic species/formation mechanism/environmental effect引用本文复制引用
郭清海..地热水环境中的甲基硫代砷:形成路径与迁移特征[J].地质学报,2025,99(4):1109-1119,11.基金项目
本文为国家自然科学基金项目(编号42277188,42077278,42111530023,42042036,41861134028,41772370,41572335,40702041)资助的成果. （编号42277188,42077278,42111530023,42042036,41861134028,41772370,41572335,40702041）
