辽宁沈抚污灌区土壤重金属环境质量评价

ENVIRONMENTAL QUALITY ASSESSMENT OF SOIL HEAVY METALS IN THE SHENYANG-FUSHUN SEWAGE IRRIGATION AREA,LIAONING PROVINCE

辽宁省沈抚污灌区自上世纪60年代以来开始接受污水灌溉,直到2000年左右才停止.由于长期接受污水灌溉,土壤污染比较严重.通过分析污灌区的土壤中4种重金属元素Zn、Cu、Pb、Cd含量,采用地质累积指数评价方法,对其地球化学特征及空间分布进行了探讨.结果表明:元素Cu和Zn的污染范围最广,元素Cd的污染程度最高,4种重金属元素污染程度排序为Cu>Zn>Cd>Pb.各元素在空间上造成的污染排序如下:李石寨(样点7)>三宝屯(样点1)>刘尔屯(样点5)>四方台(样点8)>小瓦村(样点15).

The Shenyang-Fushun area had been irrigated by industrial and life sewage since 1960s until 2000.The soil pollution is serious for the long-term of sewage irrigation.The contents of heavy metal elements of Zn,Cu,Pb and Cd in the soil of the irrigation area are analyzed to probe their geochemical characteristics and spatial distribution.The results show that,Cu and Zn have the widest range of pollution,while Cd has the highest pollution level.Generally,the pollution degree of the four elements is in the order： Cu 〉 Zn 〉 Cd 〉 Pb.The extent of pollution caused by these elements in space is as follows： Lishizhai（S07） 〉 Sanbaotun（S01） 〉 Liuertun（S05） 〉 Sifangtai（S08） 〉 Xiaowacuny（S15）.