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首页> 外文期刊>Environmental toxicology and chemistry >Isotopic and Chemical Characteristics of Mercury in Organs and Tissues of Fish in a Mercury-Polluted Lake: Evidence for Fractionation of Mercury Isotopes by Physiological Processes
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Isotopic and Chemical Characteristics of Mercury in Organs and Tissues of Fish in a Mercury-Polluted Lake: Evidence for Fractionation of Mercury Isotopes by Physiological Processes

机译：汞污染湖中鱼类器官和组织中汞的同位素和化学特征：通过生理过程分离汞同位素的证据

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摘要

Organs and tissues of whitefish and trout from mercury (Hg)-polluted Lake Ontario were analyzed for Hg isotopes, methylmercury (CH3Hg+), and inorganic Hg to investigate possible mass-dependent fractionation (MDF) and mass-independent fractionation (MIF) of Hg isotopes by physiological processes of the fish. Isotope signatures of different body parts were defined by delta-values of Hg-198/Hg-202, Hg-199/Hg-202, Hg-200/Hg-202, and Hg-201/Hg-202 ratios and by Delta-values representing effects of MIF on Hg-199/Hg-202 and Hg-201/Hg-202 ratios. The research yielded the following evidence for MDF and MIF, including MIF of isotopes with even as well as odd mass numbers, by metabolic activities: 1) anomalously low delta-values for whitefish kidneys but not for trout kidneys; 2) widely varying differences between the delta-values of different body parts of whitefish but practically uniform differences for those of trout; 3) different relationships between Delta Hg-199 and Delta Hg-201 for whitefish than for trout; 4) nonlinear correlation between delta Hg-198 and delta Hg-200 for whitefish but linear correlation for trout; 5) an inverse correlation between the delta Hg-199 values and CH3Hg+ concentrations of whitefish and trout; 6) an inverse correlation between the delta Hg-201/delta Hg-199 and CH3Hg+/inorganic Hg ratios of trout kidneys and gills (and lipids of trout near the sources of pollution) but a positive correlation for muscle, liver, and gut; and 7) inverse correlations between Delta Hg-199 and the CH3Hg+/inorganic Hg ratio for trout liver, kidneys, and gut. (C) 2017 SETAC
机译：分析了汞污染的安大略湖白鲑和鳟鱼的器官和组织中的汞同位素，甲基汞（CH3Hg +）和无机汞，以研究汞的质量依赖性分级分离（MDF）和质量非依赖性分级分离（MIF）鱼的生理过程产生的同位素。 Hg-198 / Hg-202，Hg-199 / Hg-202，Hg-200 / Hg-202和Hg-201 / Hg-202比率的差值和Delta-值代表MIF对Hg-199 / Hg-202和Hg-201 / Hg-202比率的影响。该研究通过代谢活动为MDF和MIF提供了以下证据，包括具有偶数质量数和奇数质量数的同位素的MIF：1）白鱼肾异常低的δ值，而鳟鱼肾脏异常低； 2）白鱼不同身体部位的δ值之间的差异千差万别，但鳟鱼的差异实际上是一致的； 3）白鲑和鳟鱼的Delta Hg-199和Delta Hg-201之间的关系不同； 4）白鲑的δHg-198和δHg-200之间呈非线性相关，而鳟鱼呈线性相关； 5）Hg-199值与白鲑和鳟鱼的CH3Hg +浓度成反比； 6）鳟鱼肾脏和g的δHg-201 / delta Hg-199与CH3Hg + /无机汞之比（与污染源附近的鳟鱼脂质）呈负相关，但与肌肉，肝脏和肠道呈正相关； 7）鳟鱼肝，肾和肠的Delta Hg-199与CH3Hg + /无机Hg比值成反比。 （C）2017年SETAC

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