Potential indicators for the assessment of arsenic natural attenuation in the subsurface

被引：64

作者：

Lin, ZX ^{[1
]}

Puls, RW ^{[1
]}

机构：

[1] US EPA, Natl Res Council,Off Res & Dev, Natl Risk Management & Res Lab, Sunsurface Protect & Remediat Div, Ada, OK 74820 USA

来源：

ADVANCES IN ENVIRONMENTAL RESEARCH | 2003年 / 7卷 / 04期

关键词：

arsenic; aluminosilicates; clay minerals; iron hydroxides; mineral indicators; natural attenuation; risk assessment;

D O I：

10.1016/S1093-0191(02)00056-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Arsenic is a priority pollutant found in soil and groundwater contaminated by arsenic pesticides and industrial wastes. Assessing the natural attenuation capacity of the subsurface for arsenic is a key step leading to successful site remediation. Chemical reactions between arsenic and several iron hydroxides (goethite, lepidocrocite and green rust) were studied. By comparing the arsenic attenuation capacity of iron hydroxides, clay minerals and feldspars, an order was established: iron hydroxides>clays>feldspars. Results showed that arsenic was more strongly bound by iron hydroxides than clays, and that the iron minerals studied can extensively oxidize As(III) to As(V). Under reducing conditions, the concentration of As(III) significantly decreases due to the presence of green rust and parasymplesite. The studies provide evidence that some minerals could act as mineral indicators for site characterization. Integration of mineral indicators with geochemical parameters should aid in determining the potential of natural attenuation of the subsurface with arsenic contamination. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：825 / 834

页数：10

共 21 条

[1]

Bowen H. J. M., 1979, ENV CHEM ELEMENTS, P239

[2]

BRINDLEY GW, 1980, CRYSTAL STRUCTURES C, P400

[3]

CHRISTENSEN TH, 1997, SUBSURFACE RESTORATI, P329

[4] GROUNDWATER TRANSPORT OF ARSENIC AND CHROMIUM AT A HISTORICAL TANNERY, WOBURN, MASSACHUSETTS, USA [J].