Abstract: The Characteristics of heavy metals in the sediment of 4 "key rivers" in Hong Kong have been studied. The potential ecological hazards have been assessed using Hakanson Index. The results show that the contamination level of sediments in Hong Kong rivers are from light to moderate. The main factor caused ecological hazard is cadmium, following by copper, lead, zinc, chromium.

Key words: heavy metals contamination, ecological hazard, Hakanson Index, Hong Kong

摘要： 根据重金属环境化学行为特点，应用沉积学原理，对香港“重点河流”的重金属进行了研究，并采用瑞典科学家Lars Hakanson指数法对重金属的潜在生态危害进行了评价。研究结果表明，香港河流重金属污染基本上属于轻微的生态危害和接近中等的生态危害。产生生态危害的主要重金属污染物为Cd，其次为Cu, Pb, Zn, Cr。

关键词: 重金属污染, 生态危害, 危害指数, 危害系数, 香港