珠江三角洲地区典型农田土壤重金属污染情况

Heavy Metal Pollution of Typical Farmland Soil in the Pearl River Delta

通过对珠江三角洲地区某市典型农田土壤重金属污染状况进行调查,以镇(社区)为单位,采集土壤样品133个,用ICP-MS测定土壤中AS、Cd、Pb、Cr、Cu、Ni、Zn 7种元素含量,摸清农业用地重金属污染现状与程度,为农业土壤的合理利用提供参考。结果表明:此次监测的133个农田土壤中,共有17个土壤样品超出限量标准,超标率为12.8%,其中,7个样品镉含量超出限量标准,超标率为5.3%,其中4个是菜园土,超标率4.1%,3个是水稻土,超标率8.6%;5个样品铜含量超出限量标准,超标率为3.8%,其中3个是菜园土,超标率3.1%,2个是水稻土,超标率5.7%;1个样品砷含量超出限量标准,超标率为0.75%,是菜园土,超标率1.0%,水稻土没超出限量标准;4个样品镍含量超出限量标准,超标率为3.0%,其中3个是菜园土,超标率3.1%,1个是水稻土,超标率2.9%;铅、铬、锌均未超出限量标准。比较菜园土、水稻土污染情况,镉的污染量为:菜园土<水稻土,砷的污染量为:菜园土>水稻土,铜的污染量为:菜园土<水稻土,镍的污染量为:菜园土>水稻土。

Through the investigation of heavy metal pollution in farmland soil in a typical city in the Pearl River Delta.Taking town(community)as the unit,133 soil samples were collected,and the content of 7 elements such as AS,Cd,Pb,Cr,Cu,Ni,and Zn in the soil were measured by ICP-MS to find out the status and extent of heavy metal pollution in agricultural land.Provide a reference for the rational use of agricultural soil.The results showed that:out of the 133 farmland soils monitored this time,a total of 17 soil samples exceeded the limit,with a rate exceeding the standard of 12.8%,of which 7 samples had a cadmium content exceeding the limit,with a rate exceeding the standard of 5.3%,of which 4 were vegetable gardens soil,the over-standard rate was 4.1%,three were paddy soil,and the over-standard rate was 8.6%.The copper content of five samples exceeded the limit,the over-standard rate was 3.8%,three of them were vegetable garden soil,the over-standard rate was 3.1%,and two were paddy soil.The over-standard rate is 5.7%.One sample has an arsenic content exceeding the limit standard,the over-standard rate is 0.75%,one of which is vegetable garden soil,the over-standard rate is 1.0%,and the paddy soil does not exceed the limit standard,four samples have nickel content exceeding the limit standard,over-standard the rate was 3.0%,three of which were vegetable garden soil with an overstandard rate of 3.1%,and one was paddy soil with an over-standard rate of 2.9%,lead,chromium and zinc did not exceed the limit standards.In comparing the pollution of vegetable garden soil and paddy soil,the amount of cadmium pollution in vegetable garden soil<paddy soil,arsenic pollution in vegetable garden soil>paddy soil,copper pollution in vegetable garden soil<paddy soil,nickel pollution in vegetable garden soil>paddy soil.