Tracing Mercury Contamination from the Idrija Mining Region (Slovenia) to the Gulf of Trieste Using Hg Isotope Ratio Measurements
Tracing Mercury Contamination from the Idrija Mining Region (Slovenia) to the Gulf of Trieste Using Hg Isotope Ratio Measurements
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DOI：
10.1021/es801772b
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发表时间：
2009-01-01
影响因子：
11.4
通讯作者：
Hintelmann, Holger
中科院分区：
文献类型：
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作者：
Foucher, Delphine;Ogrinc, Nives;Hintelmann, Holger
为了证明环境样品中汞的精确同位素比测量的能力，更具体地说，为了测试使用稳定同位素作为污染源的不同示踪剂，我们调查了一个有据可查的系统，斯洛文尼亚伊德里哈附近的汞矿区。沿伊德里哈河，索卡/Isonzo河，并在的里雅斯特湾的沉积物进行了分析，以确定汞同位素组成随距离的变化源。从伊德里哈河、Soca/Isonzo河和的里雅斯特湾河口附近采集的样本中也观察到了类似的汞同位素特征，这表明从Soca/Isonzo河到的里雅斯特湾的整个分水岭的沉积物主要由伊德里贾河源头输出的汞构成。只有在海湾南部的位置，外的河流羽流，表现出较低的值的同位素组成相比，亚得里亚海沉积物的汞同位素签名。使用一个简单的二元混合模型，我们可以证明，本研究中调查的所有样本都是来自伊德里哈地区的汞的不同比例的结果（从北方的>90%逐渐减少到
To demonstrate the power of precise isotope ratio measurements of Hg in environmental samples and, more particularly, to test the use of stable isotopes as distinct tracers of the contamination source, we investigated a well-documented system, the Hg mining region near Idrija, Slovenia. Sediments alongside the Idrija River, the Soca/Isonzo River, and in the Gulf of Trieste were analyzed to determine the variation in Hg isotopic composition versus distance from the source. Similar Hg isotopic signatures were observed among samples collected from the rivers Idrija, Soca/Isonzo, and around the river mouth in the Gulf of Trieste, suggesting that sediments throughout the watershed of the Soca/Isonzo River to the Gulf of Trieste are dominated by Hg exported from the headwaters of the Idrijca River. Only locations on the southern part of the gulf, outside the river plume, showed lower values of the isotopic composition comparable to the Hg isotopic signature of Adriatic Sea sediments. Using a simple binary mixing-model, we could demonstrate that all samples investigated in this study were a result of variable proportions of Hg originating from the Idrija region (progressively decreasing from >90% in the northern part to