摘要
腐殖酸对土壤和水体环境中铁(Fe)的还原过程有重要影响。本文采用从山西大同风化煤、河南巩县褐煤、云南昆明滇池底泥中提取制备的腐殖酸,通过布置培育试验并接种土壤悬液,研究了不同来源的腐殖酸对无定形氧化铁异化还原的影响。结果表明:单独添加腐殖酸对氧化铁的还原几乎没有影响;而当同时添加腐殖酸与葡萄糖时,培养基质中氧化铁的还原过程显著加强;腐殖酸浓度越高对氧化铁还原的促进作用越明显。不同来源的腐殖酸因其复杂程度和结构不同,对氧化铁还原的促进作用有明显差异,其中山西大同风化煤提取的腐殖酸促进作用最大,云南昆明滇池底泥和河南巩县褐煤提取的腐殖酸之间则无显著差异。
Humic acids have significant influences on iron reduction in soil and aquatic environment. In this paper, humic acids, extracted from weathering coal of Datong in Shanxi Province, lignite of Gongxian in Henan Province and Dianchi Lake sediment in Kunming of Yunnan Province, were used to investigate their influences on dissimilatory amorphous Fe（Ⅲ） reduction in aquatic incubation experiment by inoculating soil suspension. Results indicated that single addition of humic acid showed small influence on iron reduction, while addition ofhumic acid accompanied with glucose intensified significantly iron reduction process in the culture medium. The effect on dissimilatory iron reduction increased with the increase ofhumic acid concentration added in the culture. Humic acids extracted from the different material had different effects on dissimilatory iron reduction because of the differences in the structures and complexities of thoese material, and the humic acid extracted from the weathering coal showed the strongest effect on dissimilatory iron reduction, but no significant difference between humic acids from lignite and lake sediment.
出处
《土壤》
CAS
CSCD
北大核心
2008年第5期792-796,共5页
Soils
基金
国家自然科学基金项目(40471066)资助
关键词
腐殖酸
铁
异化还原
Humic acids, Iron, Dissimilatory iron reduction
