茂名放鸡岛海域水体重金属的分布与污染评价

Distribution and Pollution-evaluation of Heavy Metals in the Water Field around Fangji Island of Maoming

根据2004年12月和2005年11月对茂名放鸡岛海域进行的两次详细的重金属污染调查,分析了该海域水体重金属含量特征及分布特点,并按综合指数WQI法进行评价,分析其污染来源和影响因子。结果表明茂名放鸡岛海域超标重金属主要是汞、砷和铅,重金属污染的区域主要分布在小放鸡岛周围,莲头西、南以及大放鸡岛北,小部分分散在距大放鸡岛较远的南部海域。对比两年的调查结果,2005年茂名放鸡岛海域的重金属污染有加重的趋势。

The situation of heavy metals pollution around the Fangji Island of Maoming was inverstigated in December 2004 and November 2005 respectively. Six＇heavy metals were assessed by the water quality index model （ WQI ）, then the pollution source and affection factors are analyzed. The results show that, Hg, As and Pb are above national clean sea water quality. The pollution area is mostly distributed around the Xiao Fangji Island, in the west and south of Liantou, and the north of Da Fangii Island, and small pollution area is distributed in the south area far away from the Da Fangji Island. The heavy metal pollution was more serious in 2005 than that in 2004.