采煤沉陷积水区土壤覆水初期氧化还原反应过程与磷迁移转化的耦合研究

被引:6
作者
谢凯 [1 ]
易齐涛 [2 ]
孙鹏飞 [2 ]
机构
[1] 安徽理工大学理学院
[2] 安徽理工大学地球与环境学院
基金
教育部留学回国人员科研启动基金; 中国博士后科学基金;
关键词
煤矿; 沉陷积水区; 氧化还原; 孔隙水; 磷; 铁; 硫酸盐;
D O I
10.13671/j.hjkxxb.2013.11.030
中图分类号
X131.2 [水污染化学];
学科分类号
摘要
以淮南潘谢某采煤沉陷积水区为研究对象,通过设计室内模拟实验,对其农业耕作层土壤初期覆水条件下的氧化还原过程进行了考察.在此基础上研究了磷(P)自农业土壤内部向"水-土"界面迁移转化潜能,模拟实验持续近4个月.同时,实验采取土壤理化性质分析和孔隙水表征相结合的方法进行,土壤主要分析了淹水前后有机质含量(OM)、铁氧化物、P含量及其赋存形态等相关变化,而孔隙水则分析了pH、氧化还原电位(E h)、溶解无机碳(DIC)和有机碳(DOC)、Fe2+、NO-3-N、SO2-4-S,较为保守元素Cl-作为其他可变指标的参考.结果发现,研究过程中观察到了微生物活动所对应的不同氧化还原过程,1~2周后土柱内部的NO-3-N和SO2-4-S由于呼吸作用趋于耗竭,孔隙水Fe2+持续升高,并伴随着活性磷(DRP)的释放.此后整个体系氧化还原反应趋于平衡,在"水-土"界面观察到了明显的Fe"泵升"现象,弱吸附态磷(NH4Cl-P)和有机磷(OP)有向金属氧化物结合态磷(NaOH-P)迁移转化的趋势,但孔隙水内部DRP能否向表层迁移短时间内不能确定.
引用
收藏
页码:3101 / 3110
页数:10
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