酸可挥发硫对香港河流沉积物中重金属的毒性作用  

The Role of Acid Volatile Sulfide for Toxicity of Heavy Metals in Sediment of Rivers in Hong Kong

作　　者：贾振邦[1] 梁涛[1] 林健枝[2] 吕凤伟 

机构地区：[1]北京大学城市与环境学系 [2]香港中文大学地理学系

出　　处：《北京大学学报（自然科学版）》1998年第2期379-386,共8页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：香港中文大学联合书院资助

摘　　要：沉积物中重金属的含量取决于样品的酸度、氧化还原电位、总有机碳、铁锰氧化物含量等诸多因素，而沉积物中重金属的毒性取决于其赋存的化学形态、生物有效性和环境特征。众所周知，重金属可形成不溶于水的硫化物，但以往对酸可挥发硫（ＡＶＳ）能与重金属形成硫化物认识不太清楚。现已查明，重金属在沉积物中的毒性大小，ＡＶＳ起了重要作用。根据酸化过程中被溶解释放的重金属（ＳＥＭ）与ＡＶＳ当量摩尔浓度关系所产生的生物有效性，评价香港主要河流重金属的污染危害，用此方法对预测重金属毒性很有实际意义。The contents of heavy metals in sediment are decided by lots of factors such as pH,Eh,TOC,Fe Mn oxide etc.And their toxicity are up to their forms,bioavailability and environmental features.It is well know that heavy metals can form sulfides that are not soluble in water,but we are not quite clear with acid volatile sulfide (AVS) can also form sulfides with the heavy metals.AVS plays an important role on mediating the toxicity of the heavy metals in sediment.We assessed the pollution of heavy metals in the main rivers of Hong Kong based on the molar ratio of Simultaneous Extract Metals (SEM) and AVS.This method is helpful on predicting the toxicity of heavy metals.

关 键 词：沉积物 重金属 毒性 酸可挥发硫 河流 

分 类 号：X824[环境科学与工程—环境工程] X522