Absence of fractionation of mercury isotopes during trophic transfer of methylmercury to freshwater fish in captivity.
Absence of fractionation of mercury isotopes during trophic transfer of methylmercury to freshwater fish in captivity.
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DOI：
10.1021/es300794q
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发表时间：
2012-07-17
影响因子：
11.4
通讯作者：
David, Solomon R.
中科院分区：
文献类型：
--
作者：
Kwon, Sae Yun;Blum, Joel D.;Carvan, Michael J.;Basu, Niladri;Head, Jessica A.;Madenjian, Charles P.;David, Solomon R.
我们进行了两个对照实验，以确定甲基汞（MeHg）在营养转移过程中质量依赖和质量独立分离（MDF和MIF）的数量。在实验1中，将黄鲈幼鱼（Perca flavescens）人工饲养在商业食品颗粒中，然后将其饲料维持在未添加的食品颗粒（0.1µg/g MeHg）中，或者切换到添加1.0µg/g或4.0µg/g MeHg的食品颗粒中，为期2个月。添加MeHg的鱼组织和食物颗粒的δ202Hg （MDF）和Δ199Hg （MIF）的差异在分析不确定度范围内（δ202Hg; 0.07‰，Δ199Hg; 0.06‰），表明没有同位素分馏。在实验2中，将湖鳟鱼（Salvelinus namaycush）圈养在食物颗粒上，然后转移到肿胀物（Coregonus hoyi）饮食6个月。6个月后，湖鳟鱼体内的δ202Hg和Δ199Hg与肿胀者体内的同位素组成基本一致，反映了湖鳟鱼体内的汞同位素组成在新的食物来源中重新平衡，以及营养转移过程中缺乏同位素分异。我们认为，鱼类体内稳定的汞同位素比值可以用来追踪水生生态系统中汞的环境来源。
We performed two controlled experiments to determine the amount of mass-dependent and mass-independent fractionation (MDF and MIF) of methylmercury (MeHg) during trophic transfer into fish. In Experiment 1, juvenile yellow perch (Perca flavescens) were raised in captivity on commercial food pellets and then their diet was either maintained on un-amended food pellets (0.1 µg/g MeHg), or was switched to food pellets with 1.0 µg/g or 4.0 µg/g of added MeHg, for a period of 2 months. The difference in δ202Hg (MDF) and Δ199Hg (MIF) between fish tissues and food pellets with added MeHg were within the analytical uncertainty (δ202Hg; 0.07 ‰, Δ199Hg; 0.06 ‰) indicating no isotope fractionation. In Experiment 2, lake trout (Salvelinus namaycush) were raised in captivity on food pellets, and then shifted to a diet of bloater (Coregonus hoyi) for 6 months. The δ202Hg and Δ199Hg of the lake trout equaled the isotopic composition of the bloater after 6 months, reflecting re-equilibration of the Hg isotopic composition of the fish to new food sources and a lack of isotope fractionation during trophic transfer. We suggest that the stable Hg isotope ratios in fish can be used to trace environmental sources of Hg in aquatic ecosystems.
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影响因子：
11.4
作者：
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