水保所知识产出(1956---)知识库

寻找合适的材料来修复晋陕蒙地区因煤炭、石油和天然气开发导致的土壤重金属污染是该区域环境治理的重要措施． 砒砂岩具有较强的
吸附性，是可以用于土壤重金属污染修复的潜在材料． 本研究通过室内模拟实验来研究土壤中添加砒砂岩对铅形态分布、毒性溶出量( TCLP)
的影响及其对土壤孔隙度、pH、田间持水量、土壤酶活性的影响． 结果表明，砒砂岩可显著降低土壤弱酸提取态铅含量，增加可还原态与残渣态
铅含量; 随土壤中砒砂岩添加量的增加，高活性态铅的降幅越大低活性态铅的增幅越大． 砒砂岩显著降低了土壤铅毒性溶出量，降低程度与砒
砂岩添加量成正比． 砒砂岩的较强吸附特性及可以提高土壤pH 是固化土壤重金属铅的重要因素． 此外，砒砂岩对土壤理化性质的改善一定程
度上对污染土壤起着改良作用．

As one of the important aspects in regional environment management in Shanxi，Shaanxi and Inner Mongolia region，heavy metal-contaminated
soil caused by coal，oil and natural gas exploitations need to be remediated by proper materials． With high adsorption，Pisha sandstone is a good candidate
for remediation． This study carried out laboratory simulation experiments to determine the effects of the Pisha sandstone on the distributions of Pb forms
and Pb TCLP ( Toxicity Characteristic Leaching Procedure) and to determine its effects on soil bulk density，soil pH，field capacity and soil enzyme
activity． The results showed that the Pisha sandstone reduced the contents of acid extractable lead in soil and increased the contents of reducible lead and
residual lead． The reduction rate of high activity Pb and the increase rate of low activity Pb increased with the dosage of the Pisha sandstone in soil． The
Pisha sandstone significantly reduced the contents of Pb TCLP and the reduction degree was proportional to the dosage of the Pisha sandstone． The
solidification of Pb could be attributed to high absorption and the enhancement of soil pH by the Pisha sandstone． The Pisha sandstone improved soil
physical and chemical properties，which to some extent remediated Pb contaminated soil．