Chromium stable isotopes as a new tool for forensic hydrology at sites contaminated with anthropogenic chromium

摘要：

Hexavalent chromium (Cr(Ⅵ)) is an emerging contaminant in groundwaters at sites worldwide.Reduction of mobile and potentially toxic Cr(Ⅵ) to immobile and non-toxic trivalent chromium (Cr(Ⅲ)) is accompanied by significant stable isotope fractionation (εcr(VI)-cr(Ⅲ) =3.4‰). In this study, the isotopic composition of Cr(Ⅵ) in groundwaters from and surrounding a contaminated site was assessed in an attempt to distinguish natural from anthropogenic chromium pools, as well as to understand processes leading to decreasing concentrations of Cr(Ⅵ) within and at the margin of a well-defined contaminant plume. Substantial Cr isotope fractionation that would indicate protracted reduction of Cr(Ⅵ) within the plume was not observed.Both reduction of Cr(Ⅵ) and advective mixing of plume and regional groundwaters at the plume margin were required to explain the data.

作者: T.D.Bullen

作者单位: Water Resources Discipline, U.S.Geological Survey, Menlo Park, CA, USA

会议类型: 国际会议

会议名称: 第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)

会议地点: 昆明

会议语种:英文

页码: 699-702

在线出版日期: 2007-07-31（万方平台首次上网日期，不代表论文的发表时间）