硫化汞纳米颗粒的微生物摄入及其在汞甲基化中的作用

Microbial uptake of HgS nanoparticles and its effect on mercury methylation

甲基汞因其独特的食物链富集特性和毒性使汞成为重要的全球污染物.厌氧环境中微生物介导的汞甲基化是甲基汞生成最主要的来源,厌氧环境中不同汞地球化学形态控制着甲基汞的生成过程.硫化汞纳米颗粒是在实际厌氧环境中新近发现的重要颗粒汞形态,对其环境行为还缺乏基本认识.本文基于硫化汞纳米颗粒的环境行为,重点围绕其与微生物的相互作用,讨论并总结了硫化汞纳米颗粒的生成、硫化汞纳米颗粒的微生物摄入、溶解以及硫化汞纳米颗粒对微生物汞甲基化的影响,并进一步对硫化汞纳米颗粒与微生物相互作用的未来研究重点进行了展望.

Methylmercury(MeHg),due to its high bioaccumulative capability and toxicity,has been the focus of global mercury(Hg)contamination.Microbial methylation of mercury in anoxic zones is generally regarded as the dominant source of MeHg,and mercury methylation is governed by the different geochemical forms of inorganic mercury present in anoxic zones.Mercury sulfide(HgS)nanoparticles,a kind of"newly discovered"particulate Hg species,is the dominant Hg species in anoxic zones and rarely reported about their environmental behavior.This review focused on the environmental transformation processes of HgS nanoparticles,especially the interaction with microorganism,discussed and summarized the formation pathway,microbial uptake,dissolution of HgS nanoparticles and its effect on mercury methylation.The future trends in the interaction of microorganism and HgS nanoparticles was also proposed.