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环境化学 2015

彩塘电镀区底泥重金属污染与释放特征

林文杰,周晚春,刘岱纯,肖唐付,翁超

Keywords: 电镀废水,底泥,重金属污染,形态特征,释放

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Abstract:

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.

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