罗婉,夏建国

• 1:四川农业大学资源环境学院

摘要(Abstract)：

以名山河流域水稻土为例,通过实验室模拟,采用等温吸附法和NaNO3、HCl溶液解吸法,研究了土壤组分(有机质、游离氧化铁)对原土及各粒径微团聚体吸附-解吸Hg2+的影响。结果表明:1)原土及各粒径微团聚体对Hg2+的吸附量随平衡溶液质量浓度增大而增加,吸附量与阳离子交换量、有机质质量比、游离氧化铁质量比呈极显著正相关(R2=0.9746~0.9836);Langmuir方程拟合效果最佳,达到显著水平(R2=0.9988~0.9996);分布系数Kd值与Hg2+初始质量浓度呈负相关;2)去除土壤组分后,原土及各粒径微团聚体对Hg2+的吸附量均有所减少,吸附减少量与有机质和游离氧化铁去除率呈显著正相关(R2=0.9960,R2=0.9468);3)原土及各粒径微团聚体对Hg2+的解吸率随吸附量增加而增加,并且以专性吸附的解吸为主,其解吸率在50%左右;去除各土壤组分后,原土及各粒径微团聚体对Hg2+的非专性吸附的解吸率增加,专性吸附的解吸率降低,土壤中Hg2+的流动性更大,对流域内地下水、土壤生物及作物的潜在威胁增大。

关键词(KeyWords)： 环境科学技术基础学科;名山河流域;Hg2+;水稻土;微团聚体;吸附解吸

Abstract:

Keywords:

基金项目(Foundation): 四川农业大学学科建设双支计划项目(2013)

作者(Author): 罗婉,夏建国

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