Tracing and Quantifying Anthropogenic Mercury Sources in Soils of Northern France Using Isotopic Signatures
详细信息 查看全文
- 作者：Nicolas Estrade ; Jean Carignan ; Olivier F. X. Donard
- 刊名：Environmental Science & Technology
- 出版年：2011
- 出版时间：February 15, 2011
- 年：2011
- 卷：45
- 期：4
- 页码：1235-1242
- 全文大小：924K
- 年卷期：v.45,no.4(February 15, 2011)
- ISSN：1520-5851
文摘
The mercury (Hg) isotopic composition was investigated in topsoils from two case studies in north of France. The Hg isotope composition was first determined in agricultural topsoils contaminated by a close by Pb鈭抁n smelter. The Hg isotopic composition was also measured in topsoils from an urban area in northeastern France (Metz). In both cases, no significant mass independent isotope fractionation could be found in the soils. However, the soil isotopic composition (未202Hg) was enriched in the heavier isotopes as the Hg concentration increased in the soils. A linear relationship between the 未202Hg in soils and 1/[Hg] indicated a mixing between a contamination source and the Hg derived from the geogenic background soils. Such findings demonstrate that the contamination signature was preserved in the soils and that the deposition of anthropogenic Hg was predominant compared to reactions leading to isotope fractionation such as biotic and abiotic reduction of Hg(II) and resulting in Hg mobility or evasion from the soils. It was therefore possible, for the first time in the case of Hg, to evaluate the contribution of the contamination source relative to the background Hg source in urban topsoils using relative isotope abundances.