农业环境科学学报2017，Vol.36Issue(8)：1526-1536,11.DOI:10.11654/jaes.2017-0189
有机酸对As(V)在土壤中老化的影响
Influence of organic acids on As(V)aging in soils
摘要
Abstract
Incubation experiments were conducted to study the influence of different organic acids(acetic acid, oxalic acid, citric acid, and humic acid)on the aging process of arsenic(As aging)in quaternary red clay. The results indicated that the influence was not significant at 25℃and at the maximum field moisture capacity of 70%, while the organic acid amounts significantly affected available As and combined As in soils. Acetic acid added at 50 and 100 mg·kg-1 inhibited As aging in soils, while acetic acid added at 200 mg·kg-1 promoted As aging. However, oxalic acid and citric acid added at 50 mg·kg-1 promoted As aging and the inhibition was observed at 100 and 200 mg·kg-1. Ar-senic aging in soils was significantly inhibited after adding humic acid and comparatively, less significant effects were detected with other organic acids. Acetic acid and oxalic acid addition at 50~200 mg·kg-1 significantly decreased the specifically sorbed As. Citric acid and hu-mic acid added at 50~100 mg·kg-1 significantly increased the amorphous and poorly-crystalline hydrous Fe/Al oxides associated with As. Acetic acid, citric acid, and humic acid addition at 200 mg·kg-1 significantly increased the well-crystalline hydrous Fe/Al oxides associated with As. These observations will not only provide an understanding of the effects of different types of organic acids on the release, migration, and transformation of As in soil, but also will be the reference for the regulation and safe use of As-contaminated soils.关键词
As(V)/土壤老化/有机酸/有效态砷/结合态砷Key words
arsenate/soil aging/organic acids/available As/combined As分类
资源环境引用本文复制引用
高雪,曾希柏,白玲玉,尼玛扎西,苏世鸣,王亚男,吴翠霞..有机酸对As(V)在土壤中老化的影响[J].农业环境科学学报,2017,36(8):1526-1536,11.基金项目
国家自然科学基金青年项目(41401280)"外源砷胁迫下土壤中氨氧化细菌和古菌群落的响应机理"Project supported:The National Natural Science Foundation of China(41401280)"Response mechanisms of ammonia oxidizing bacteria and ammonia oxidizing archaea to exogenous arsenic stress in soil" （41401280）
