分析测定河北省涞源县某铅锌矿区污染土壤的重金属(Zn,Pb,Mn,Ni,Cr,Cd)含量,基于美国法定重金属污染评价方法(toxicity characteristic leaching procedure,TCLP)对土壤重金属污染状况及生态环境风险进行评价,并对TCLP浸提剂进行比较筛...分析测定河北省涞源县某铅锌矿区污染土壤的重金属(Zn,Pb,Mn,Ni,Cr,Cd)含量,基于美国法定重金属污染评价方法(toxicity characteristic leaching procedure,TCLP)对土壤重金属污染状况及生态环境风险进行评价,并对TCLP浸提剂进行比较筛选,探究TCLP浸提量与重金属化学形态的相关性。比较两种TCLP浸提剂发现,浸提剂B(用试剂水稀释17.25 m L的冰醋酸至1 L,配制后溶液p H值为2.64±0.05)比浸提剂A(加5.7 m L冰醋酸至500 m L试剂水中,再加入64.3 m L 1 mol/L氢氧化钠溶液,稀释至1 L,配制后溶液p H应为4.93±0.05)能更有效地提取土壤中的重金属,并且两者之间存在一定的正相关性,TCLP浸提液中的重金属质量分数与重金属的可交换态、碳酸盐结合态存在一定的关系。展开更多
A large amount of solid waste has been produced by the antimony smelting process in the＂World Capital of Antimony＂, Xikuangshan area in China. This study comprehensively investigated the physical and chemical charac...A large amount of solid waste has been produced by the antimony smelting process in the＂World Capital of Antimony＂, Xikuangshan area in China. This study comprehensively investigated the physical and chemical characteristics of the various solid wastes, as well as the leaching behavior of the solid wastes, which included water-quenched slag,arsenic-alkali residue, desulfurized slag and blast furnace dust. These four types of waste were enriched in a variety of heavy metals and metalloids and more specifically with As and Sb levels up to 8.6 × 104 and 3.16 × 105mg/kg, respectively, in arsenic-alkali residue. For desulfurized slag and water-quenched slag, the leaching concentration of Sb significantly exceeded the acceptable limits during the leaching tests using the toxicity characteristic leaching procedure and the synthetic precipitation leaching procedure. In addition, As leaching in arsenic-alkali residue was extraordinarily hazardous, being three orders of magnitude higher than the regulatory level of As. According to the results of the extraction tests, all the tested wastes were classified as hazardous waste.展开更多
文摘分析测定河北省涞源县某铅锌矿区污染土壤的重金属(Zn,Pb,Mn,Ni,Cr,Cd)含量,基于美国法定重金属污染评价方法(toxicity characteristic leaching procedure,TCLP)对土壤重金属污染状况及生态环境风险进行评价,并对TCLP浸提剂进行比较筛选,探究TCLP浸提量与重金属化学形态的相关性。比较两种TCLP浸提剂发现,浸提剂B(用试剂水稀释17.25 m L的冰醋酸至1 L,配制后溶液p H值为2.64±0.05)比浸提剂A(加5.7 m L冰醋酸至500 m L试剂水中,再加入64.3 m L 1 mol/L氢氧化钠溶液,稀释至1 L,配制后溶液p H应为4.93±0.05)能更有效地提取土壤中的重金属,并且两者之间存在一定的正相关性,TCLP浸提液中的重金属质量分数与重金属的可交换态、碳酸盐结合态存在一定的关系。
基金supported by the Environment Protection Specific Project (Nos. 201409096, 201009037-06)the National Natural Science Foundation of China (Nos. 41273105, 41371440)
文摘A large amount of solid waste has been produced by the antimony smelting process in the＂World Capital of Antimony＂, Xikuangshan area in China. This study comprehensively investigated the physical and chemical characteristics of the various solid wastes, as well as the leaching behavior of the solid wastes, which included water-quenched slag,arsenic-alkali residue, desulfurized slag and blast furnace dust. These four types of waste were enriched in a variety of heavy metals and metalloids and more specifically with As and Sb levels up to 8.6 × 104 and 3.16 × 105mg/kg, respectively, in arsenic-alkali residue. For desulfurized slag and water-quenched slag, the leaching concentration of Sb significantly exceeded the acceptable limits during the leaching tests using the toxicity characteristic leaching procedure and the synthetic precipitation leaching procedure. In addition, As leaching in arsenic-alkali residue was extraordinarily hazardous, being three orders of magnitude higher than the regulatory level of As. According to the results of the extraction tests, all the tested wastes were classified as hazardous waste.
