作　　者： ; ; ;

机构地区： 广东工业大学环境科学与工程学院

出　　处： 《环境科学与技术》 2011年第1期56-58,113,共4页

摘　　要： 北江长期受到上游采矿和冶金行业排放的含镉废水的污染,使其沉积物中镉含量偏高。研究通过采集北江表层沉积物,并对其中镉的含量和形态进行分析测定,系统研究了北江表层沉积物中镉的含量和可交换态、碳酸盐态、铁锰态、有机态、残渣态镉占总量的比例。在此基础上计算出镉的生物可利用态、生物潜在可利用态和生物不可利用态的含量,研究了镉被水生生物吸收的可能性。结果表明,北江各采样断面表层沉积物中镉的含量为11.7～76.0 mg/kg,其中生物可利用态含量范围为1.6～14.1 mg/kg,占总量的比例范围为10.0%～18.6%;生物潜在可利用态含量范围为3.6～46.8 mg/kg,占总量的比例范围为30.8%～61.6%;镉主要以生物可利用态和生物潜在可利用态形式存在,容易被生物吸收进入生物体内,对北江的镉污染应给予高度关注。 Tessier＇s sequential extraction procedure was used to study the speciation and concentration of cadmium in the sediments of Beijiang River,which was sampled in April 2007.Cd in exchanged,carbonate,Fe-Mn oxides,organic and residual forms were measured,the bioavailable form,potential bioavailable form and biounavailable form of Cd were calculated and then the bioavailability characteristics were investigated.It was concluded that Cd content in the river sediments was higher than average of other rivers in China and Cd in terms of its speciation is liable to be absorbed by the aquatic organisms in the river leading to ecological risk,to which much attention should be attached.

关 键 词： 北江 沉积物 镉 生物可利用性

领　　域： [环境科学与工程]