| 废弃线路板中重金属形态分布特征 |
| 摘要点击 2231 全文点击 1597 投稿时间：2008-10-08 修订日期：2008-12-20 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 废弃线路板 重金属 化学形态 BCR法 Tessier 法 |
| 英文关键词 printed circuit boards (PCBs) heavy metal chemical speciation BCR’s extraction procedures Tessier’s sequential extraction procedures |
|
| 中文摘要 |
| 通过 BCR3态连续提取方法和Tessier 5步连续提取方法，对某废弃线路板中重金属的赋存形态进行研究．结果表明，BCR连续提取法对废弃线路板中重金属的提取率比Tessier连续提取方法高．废弃线路板中Cu、Pb、Zn和Ni各形态分布差别很大．BCR和Tessier连续提取方法结果均表明废弃线路板中Ni主要是以残渣态存在，对环境的污染风险小；而Pb和Zn主要以酸可提取态或者碳酸盐态和可交换态存在，在南方酸雨环境中容易溶出；BCR 和Tessier连续提取方法对Cu的活性评价不一致，但是由于废弃线路板中Cu总量高，对环境的影响不可忽视． |
| 英文摘要 |
| The environmental availability of heavy metals from the waste printed circuit boards (PCBs) were studied through BCRs three-stage extraction procedures from EU and Tessiers five sequential extraction procedures. The results show that the heavy metal extraction rates with BCRs procedures are higher than that with Tessier's from waste PCBs. There are significant differences in fraction distributions of heavy metals in PCBs. The speciation of Ni in the PCBs exists mainly in residual forms and has little effect on the environment. The percentage of acidic extractable forms with BCRs method and the total amount of exchangeable and carbonate which bound for Tessiers procedure of Pb and Zn are high, in the South China, the two metals are more easily released by acid rain. Acidic extractable forms of Cu is the main speciation in PCBs with BCRs extraction procedures, while the percentage of Fe-Mn oxides- bound of Cu is the highest with Tessiers procedures, though the result is not agree consistent, due to the high content of Cu in PCBs, the harm of Cu from PCBs could not be neglected. |
