二甲基汞（ DMeHg）是毒性最强的汞化合物之一，因其具有很强的生物累积性和生物放大效应，对人体健康构成了严重的威胁。由于DMeHg易光解、挥发性强且微量即可致死，因此很难获得DMeHg的高纯标准样品且对实验者健康风险极大。本实验旨在建立一种可持续产生低浓度、发生效率高、可控性好操作简单且成本低的气态二甲基汞发生系统。结果表明，甲基钴胺素（ MeCo）∶标准汞溶液（ Hg2＋）的质量比为10∶1，盐度（0—0．01 mol·L－1），pH＝4的条件下，通过改变标准汞溶液的浓度及反应温度：9℃条件下，0．025 mg·L－1、0．015 mg·L－1的Hg2＋溶液产生DMeHg的速率在40—140 h期间分别维持在300 pg·min－1和150 pg·min－1；在18℃条件下，0．025 mg·L－1、0．015 mg·L－1的 Hg2＋溶液产生 DMeHg 的速率在50—130 h 期间分别维持在500 pg·min－1和300 pg·min－1。该系统为进一步研究二甲基汞的环境过程及其效应提供了可靠的技术支撑。
Dimethylmercury( DMeHg ) is one of the most toxic mercury compounds, and it has a serious threat to human health due to its ability of bioaccumulation and biomagnification. Since DMeHg could be decomposed easily under sunlight, and is volatile and fatal, it is difficult to acquire the high purity standard sample of DMeHg, furthermore, it is harmful to researchers. The aim is to design a DMeHg generating system of low concentration and high efficiency, which could not only produce gaseous DMeHg in low concentration and high controllability, but also has the characteristics of low cost and simple operation. In this study, when the mass concentration ratio of methylcobalamin(MeCo) and standard mercury solution(Hg2+)=10∶1, salinity(0—0.01 mol·L-1), pH=4.0, DMeHg generation rates of 0.025 mg·L-1 and 0.015 mg·L-1 mercury concentrations during 40—140 h were maintaining about 300 pg·min-1 and150 pg·min-1 at the temperature of 9℃,and the rates of 0.025 mg·L-1 and 0.015 mg·L-1 mercury concentrations during 50—130 h were maintaining about 500 pg·min-1 and 300 pg·min-1 at the temperature of 18℃. Therefore, this DMeHg generation system is benefit to further research the environmental process and effects of mercury.
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