Characteristics and accumulation of heavy metals in sediments originated from an electroplating plant
Characteristics and accumulation of heavy metals in sediments originated from an electroplating plant
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DOI：
10.1016/j.jhazmat.2008.07.045
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发表时间：
2009-04-30
影响因子：
13.6
通讯作者：
Chen, Xiaoqin
中科院分区：
文献类型：
--
作者：
Hang, Xiaoshuai;Wang, Huoyan;Chen, Xiaoqin
对江苏省中国某电镀厂河水和底泥中重金属对环境的影响进行了研究和分析。结果表明，该厂排放的废水降低了该厂下游的水环境质量。在地表水中，铜、镍、锌、锰和铬在工厂附近的位置存在相当大的浓度。在所有地点都观察到了不安全水平的铜，一些地点存在不安全水平的镍、锌和铬。沉积物中镍、铜、锌、铬有明显的积累，沉积物中重金属的纵向分布与水中的相似。各部位的镍、铜、铬含量及部分部位的锌含量可能对环境造成不良影响。水和沉积物中镍、铜、锌和铬的风险随着下游距离的增加而降低。此外，采用改进的顺序萃取法测定了沉积物中金属的交换态、碳酸盐结合态、铁锰氧化物结合态、有机质结合态和残留态。结果表明，除铁-锰氧化物结合态外，镍在各组分中均有分布，可交换态中锰含量较高，铜在有机质和残渣态中所占比例较高。残渣态是土壤中铅、锌的主要形态。根据RACS，镍和锰对环境构成高风险，锌表现为中到高风险，铜表现为低到高风险，铅具有低到中等风险。(C)2008爱思唯尔B.V.保留所有权利。
Heavy metals in river water and sediments originated from an electroplating plant in Jiangsu Province of China were studied and analyzed for their environmental impact. The results indicated that the wastewater from the plant degraded the quality of the aquatic environment downstream from the plant. In surface water, considerable concentrations of Cu, Ni, Zn, Mn and Cr were present at the sites near the plant. Unsafe levels of Cu were observed at all sites, and unsafe levels of Ni, Zn, and Cr were present at some sites. Significant accumulation of Ni, Cu, Zn and Cr was identified, and heavy metal longitudinal distribution in sediments was similar to that in water. The contents of Ni, Cu and Cr at all sites and Zn at some sites were likely to result in harmful effects on the environment. The risks posed by Ni, Cu, Zn and Cr in water and sediments decreased with increasing downstream distance. Moreover, a modified sequential extraction procedure was employed to determine exchangeable, carbonate-bound, iron-manganese oxide bound, organic matter bound and residual fractions of metals in sediments. The results showed that Ni was distributed in every fraction except for iron-manganese oxide bound, significant Mn exhibited in exchangeable fractions, and high percentage of Cu was in the organic matter and residual fractions. Residual fraction was the dominant fractions for Pb and Zn. According to RACs, Ni and Mn posed a high risk to the environment, Zn exhibited medium to high risk, Cu had low to high risk, and Pb possessed a low to medium risk. (C) 2008 Elsevier B.V. All rights reserved.