彩塘电镀区底泥重金属污染与释放特征  

Characteristics of pollution and release of heavy metals in the sediment of Caitang electroplating area

作　　者：林文杰[1,2] 周晚春[1] 刘岱纯[1] 肖唐付[2] 翁超[1] 

机构地区：[1]韩山师范学院,潮州521041 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002

出　　处：《环境化学》2012年第12期1979-1984,共6页Environmental Chemistry

基　　金：韩山师范学院博士启动基金项目;广东省科技计划项目(2010B031800008);环境地球化学国家重点实验室开放基金(SKLEG8006)资助

摘　　要：采集了彩塘不锈钢电镀区河段9个典型底泥样品,研究了底泥重金属含量及其地球化学形态以及底泥在不同pH值下的释放特征,并探索了碱石灰对底泥重金属的固定效果.研究表明,该区域底泥中Cr、Cu、Cd、Ni、Pb、Zn大大超过了广东省土壤背景值,其中Cu、Cd、Cr、Ni超过了《土壤环境质量标准》(GB15618—1995)二级标准的4.4、3.7、1.6、5.3倍.底泥中的重金属迁移性的大小为Cd>Zn>Ni>Pb>Cu>Cr.重金属释放是长期持续过程,随着水体pH值降低,底泥重金属释放量逐渐升高.底泥中加入碱石灰能有效地降低重金属的生物有效性,减少底泥重金属释放.Nine sediment samples were collected from the stream in Caitang electroplated area. Eoncentratlons ot studied. The results showed that the concentrations of Cr, Cu, Cd, Ni, Pb and Zn were over the bac kground concentrations in Guangdong Province. Concentrations of Cu, Cd, Cr and Ni were 4.4, 3.7, 1.6 and 5.3 times higher than second-level limit of Standard of Soil Environment （GB15618--1995）. The order of heavy metal mobility in sediments is Cd 〉 Zn 〉 Ni 〉 Pb 〉 Cu 〉 Cr. Release amount of heavy metals in sediments increased with increasing pH values. Heavy metal bioavailability in the sediments decreasesd by addition of soda lime into sediments, reducing the release of heavy metals in sediments.

关 键 词：电镀废水 底泥 重金属污染 形态特征 释放 

分 类 号：X833[环境科学与工程—环境工程]