珠江广州河段底泥中汞铜铅的污染及其与有机质硫化物积累的关系

珠江广州河段底泥中有机质、硫化物和重金属汞、铜、铅的污染监测结果表明：各种污染物的含量范围分别为有机质２０．８—７４．４ｇ／ｋｇ，硫化物２８．７—５３８ｍｇ／ｋｇ，汞０．０７－０．７４ｍｇ／ｋｇ，铜２０．９—１０１ｍｇ／ｋｇ，铅１４．２—９１７ｍｇ／ｋｇ；它们在沿程各断面的分布表现为上游往中游递增，而中游向下游递减，基本上以猎德、广纸和黄沙三个断面的污染最严重；各种污染物的污染程度顺序是硫化物＞汞＞铜＞铅。相关分析表明：汞、铜与有机质和硫化物的相关关系均达到极显著水平。说明随着底泥中有机质和硫化物积累的增加，汞、铜的富集量相应增加，污染加重。

Pollution of Mercury, Copper and Lead in Sediment of Guangzhou Reach of Pearl River and Its Relationship with Accumulation of Organic Matter and Sulphide

Results from the monitoring of the pollution of organic matter, sulphide, Hg, Cu and Pb in sediment of Guangzhou reach of the Pearl River shows that,the contents of the pollutants are 20. 8-74. 4 g/kg for organic matter, 28. 7- 538 mg/kg for sulphide 10. 07-0. 74 mg/kg for Hg, 20. 9- 101mg/kg for Cu, 14. 2-917mg/kgfor Pb; the sectional distributions of them appear increase progressively from.upperreach to middle reach, and decrease progressively from middle reach to lower reach; the most serious pollution is basically at the three sections at Liede, Guangzhi and Huangsha; the pollution degree order of the pollutants is sulphide>Hg>Cu>Pb. Correlation analysis also shows that the relationships of Hg and Cu with organic matter and sulphide are extremely significant, indicating that the accumulative amounts of Hg and Cu increase with the increase in the accumulation of organic matter and sulphide in the sediment, and meaning that the pollutions become more serious.