期刊论文

Manganese enhances the Cd immobilization by the biological soil crusts in paddy fields

Peng, L.

中文

环境科学学报

0253-2468

2018

38

10

4150-4156

10.13671/j.hjkxxb.2018.0223

(41401260):国家自然科学基金 (2017ZK34):湖南农业大学大学生科技创新项目 (2017JJ2112):湖南省自然科学基金

本校为第一且通讯机构

为了解在不同浓度的锰盐作用下生物土壤结皮对稻田灌溉水中镉的固定作用及机制,将不同浓度的硫酸锰、镉溶液与稻田生物土壤结皮混合,并在实验室内培养15 d.通过分析生物土壤结皮中不同形态的锰、镉的量,探究不同浓度锰盐对土壤结皮中镉的固定及分布的影响.结果表明:锰盐能有效地促进生物土壤结皮固定镉,随着锰盐浓度的增加,生物土壤结皮对镉的去除效率增加.在20.00 mg·L~(-1)硫酸锰条件下,生物土壤结皮对水中镉离子去除率达到98.20%,镉主要以非乙二胺四乙酸可提取的矿物形态存在.通过扫描电子显微镜-电子散射能谱及X射线光电子能谱分析,锰被锰氧化菌氧化成类似水钠锰矿的多孔海绵状物质,镉富集...

The effect of biological soil crust (BSC) on the immobilization and removal of heavy metal from irrigation water is an important issue. BSC was cultured in solutions with different concentrations of manganese (Mn) salt and cadmium (Cd) sulfate for 15 days. We analyzed the Mn, Cd, and Fe contents in the BSC and investigated the effects of Mn salt on the Cd distribution in different binding-forms in BSC as well. The results show that Mn salt was effective at enabling BSC to immobilize the Cd, and its removal efficiency from irrigation water impro...