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Leaching Characteristics and risk evaluation of heavy metals from recyle materials and contaminated soil with sequential extraction test

回收料及污染土壤中重金属的浸出特性及风险评价序贯萃取试验

基本信息

批准号：
15560472
负责人：
KANJO Yoshinori
金额：
$ 2.37万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560472/
关键词：
BCR Sequential extraction test heavy metals leaching recycle materials contaminated soil

项目摘要

Leaching amounts of heavy metals in the leachates are closely related to the forms of heavy metals in the wastes. Several kinds of sequential leaching tests have been used as a tool to clarify the extractable forms of trace elements like heavy metals in solid samples. These procedures for the determination of the extractable trace metals in soil and sediments were harmonized as the BCR method by the Standards, Measurements and Testing Programs in Europe in 1992. But we cannot apply the BCR method to alkali samples because this method is only for neutral samples.In this study, we improved the condition of the BCR sequential extraction method in order to apply to alkali samples. Moreover, this modified BCR sequential extraction method was applied to the recycle materials and contaminated soils in order to evaluate the extractable forms of recycle materials and contaminated soils.As the results, we could obtain the adequate amounts of heavy metals for each fraction from alkali samples by the modified BCR method, which had the distilled water extraction and neutralization procedures as pre-treatment steps. Judging from the results of the reagents, the oxides of Pb, Cd, Cu and Zn were mainly extracted in the acid soluble fraction, and sulfides were mainly extracted in the oxidisable fraction. From these results, the feature of each fraction obtained by the modified BCR method was able to be clarified. However, the extractable forms of Cr could not be evaluated. Furthermore, the modified BCR method was applied to the recycle materials and contaminated soils, and the heavy metals contained in each sample could be classified from a viewpoint of elution characteristics. These results showed that elution risk of heavy metal was low.

垃圾渗滤液中重金属的浸出量与垃圾中重金属的存在形态密切相关。几种连续浸出试验已被用作澄清固体样品中痕量元素（如重金属）可浸提形式的工具。1992年，欧洲标准、测量和测试计划将这些测定土壤和沉积物中可提取痕量金属的程序统一为BCR方法。但BCR法仅适用于中性样品，不能用于碱性样品，本研究对BCR连续萃取法的条件进行了改进，使其适用于碱性样品。将改进的BCR连续提取法应用于再生材料和污染土壤中，以评价再生材料和污染土壤的可提取形态，结果表明，采用改进的BCR连续提取法，以蒸馏水提取和中和为前处理步骤，可以从碱金属样品中提取出各组分的重金属。从各试剂的萃取结果来看，Pb、Cd、Cu、Zn的氧化物主要被萃取到酸溶性组分中，硫化物主要被萃取到可氧化性组分中。从这些结果中，能够澄清通过改进的BCR方法获得的每个级分的特征。但是，无法评价Cr的浸提形式。将改进的BCR法应用于回收物料和污染土壤中，从淋洗特征的角度对各样品中的重金属进行了分类。这些结果表明，重金属的洗脱风险较低。