北京大学学报(自然科学版)

酸可挥发硫对香港河流沉积物中重金属的毒性作用

贾振邦1, 梁涛1, 林健枝2, 吕凤伟2   

  1. 1北京大学城市与环境学系,北京,100871; 2香港中文大学地理学系,香港,新界,沙田
  • 收稿日期:1997-06-06 出版日期:1998-04-20 发布日期:1998-04-20

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

JIA Zhenbang1, LIANG Tao1, LAM Kinche2, LIU Fengwei2   

  1. 1The Urban and Environmental Science Department of Peking University, Beijing, 100871; 2The Geography Department of Chinese University of Hong Kong, Hong Kong, N.T., Shatin
  • Received:1997-06-06 Online:1998-04-20 Published:1998-04-20

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。

关键词: 香港, 沉积物, 重金属, 毒性, 酸可挥发硫, 同时释放金属

Abstract: 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.

Key words: Hong Kong, sediment, heavy metals, toxicity, AVS, SEM

中图分类号: