浏阳河表层底泥中重金属形态分析研究  

Study on the Speciation of Heavy Metals in Liuyang River Sediments

作　　者：李荣喜[1] 雷敏[1] 余取民[1] 陈圆华[1] 杨珊[1] 刘迎新[1] 

机构地区：[1]长沙学院生物工程与环境科学系,长沙410003

出　　处：《工业安全与环保》2014年第6期19-21,25,共4页Industrial Safety and Environmental Protection

基　　金：长沙市科技局科技计划(K110710-31);湖南省科技厅科技计划(2011sk3113);湖南省重点建设学科资助项目

摘　　要：采用HNO3-HF-HClO4全分解和Testier连续提取-火焰原子吸收法,研究了浏阳河芙蓉桥至湘江汇入段表层底泥中重金属形态及其含量的分布情况,及其对水体的二次污染状况。结果显示:①5个采样点的各重金属含量差别较大,总体上重金属污染程度为Cd>Pb>Cu>Ni,同时Cd对浏阳河的潜在的生态危害性较强,其他3种重金属则属于轻微生态危害;②各重金属形态分布各异,Cd、Pb、Cu主要以碳酸盐结合态(F2)和铁锰氧化物结合态(F3)存在,Ni主要以残渣态存在。To determine the environmental pollution levels, the speciation of heavy metals in the sediment of five sports from Liuyang River is tested by AAS with digested by HNO3 - HF - HClO4, and the distribution of speciatinn characteristics of heavy metals is extracted with Tessier sequential extraction procedure. The results show that： ①the total concentration of each heavy metal is different at each sample, the contamination sequences for heavy metals follow Cd 〉 Pb 〉 Cu 〉 Ni, meanwhile the potential ecological risk factor of Cd is highest and others are in lower pollution degree;②the comparisons of sequential extraction results show that the main existence forms of Cd, Pb and Cu are carbonates bound（F2） and Fe- Mn oxide bound（F3） and of Ni in the resistant fraction.

关 键 词：底泥 重金属污染 存在形态 

分 类 号：X522[环境科学与工程—环境工程]