Fractions and colloidal distribution of arsenic associated with iron oxide minerals in lead-zinc mine-contaminated soils: Comparison of tailings and smelter pollution

被引：48

作者：

Ma, Jie ^{[1
,2
,3
]}

Lei, Mei ^{[4
]}

Weng, Liping ^{[1
,2
]}

Li, Yongtao ^{[2
,3
]}

Chen, Yali ^{[1
,2
]}

Islam, Md Shafiqul ^{[1
,2
]}

Zhao, Junying ^{[5
]}

Chen, Tongbin ^{[4
]}

机构：

[1] Minist Agr & Rural Affairs, Key Lab Environm Factors Control Agroprod Qual Sa, Tianjin 300191, Peoples R China

[2] Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China

[3] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China

[4] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China

[5] Tianjin Univ Technol, Sch Environm Sci & Safety Engn, Tianjin 300384, Peoples R China

来源：

CHEMOSPHERE | 2019年 / 227卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Arsenic fraction; Iron mineralogy; Soil; Colloid; Sequential extraction; Reaction kinetics; SEQUENTIAL EXTRACTION PROCEDURE; PARTICLE-SIZE FRACTIONS; HEAVY-METALS; HUMIC-ACID; BIOACCESSIBILITY; ADSORPTION; SPECIATION; FERRIHYDRITE; REACTIVITY; TRANSPORT;

D O I：

10.1016/j.chemosphere.2019.04.030

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The mining and smelting of lead-zinc (Pb-Zn) ores cause widespread As contamination. The fractions and colloidal distribution of As associated with Fe oxide minerals in Pb-Zn mine-contaminated soils have not been well understood. In this study, As fractions associated with Fe oxide minerals in Pb-Zn tailings- and smelter-contaminated soils were compared using sequential extraction techniques. Kinetic experiments were conducted to characterize the reactivity of Fe oxide minerals. The distribution of As and Fe oxide minerals in soil colloids were analyzed. The results show that in mining-contaminated soils (both tailings and smelter) the relatively active fraction (amorphous hydrous oxide-bound As, As-F3) has a strong relationship with easily reducible Fe (Fe-ox1). In smelter-contaminated soils, relatively stable fractions (crystalline hydrous oxide-bound As, As-F(4)) were closely associated with reducible Fe (Fe-ox2). Although the average proportions of specifically-bound As (AsF2) and As F-3 in contaminated soils were similar, high As release in tailings-contaminated soils was observed because of the high reactivity of Fe oxide minerals in those soils compared with that in smelter-contaminated soils. Some slightly polluted soils with high pH and TOC concentrations formed As-bearing colloidal suspensions. Especially in smelter-contaminated soils, many small sized soil colloids could facilitate As migration with surface runoff or vertical transport. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：614 / 623

页数：10

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