新疆奎屯垦区土壤砷污染现状评价

研究用网格布点法在奎屯垦区三个团场共采集土壤样品67个。通过对土壤中砷的测定,利用地统计学方法与GIS技术研究了该区域土壤(0～20cm)砷的污染状况,对土壤中砷的分布进行了探讨,并对砷在土壤中的含量进行了预测。结果表明:奎屯垦区土壤砷含量为10.31～33.99mgkg-1,平均值为20.21mgkg-1,高于全国平均水平(11.2mgkg-1);在所调查的67个土壤样点中有14个点超过了农田土壤环境的二级指标,超标率为20.90%,有29个点达到了警戒值;土壤砷含量大于25.00mgkg-1的区域主要在127团的东北部和西南部,128团的西北部和中部,在129团的西部和东南部也有零星分布。

Evaluation of Arsenic Pollution of Soil in Kuitun Reclamation Area of Xinjiang

Sixty-seven soil samples were taken from three state farms in Kuitun reclamation area of Xinjiang by using grid-sampling method, and the geo-statistical method and GIS technology were used to analyze the testing data. The results showed that the content of arsenic in soil ranged from 10.31 to 33.99 mg kg-1, the average value was 20.21 mg kg-1 which is higher than the national average level(11.2 mg kg-1). There were 14 soil samples which content of arsenic exceeds the Grade-2 of National Quality Standard of Soil Environment, the rate of overrun was 20.90%. Arsenic content of 29 soil samples comes to cautionary value. The districts of the soil arsenic content more than 25.00 mg kg-1 was mostly at northeast and southwest of No.127 state farm, northwest and center of No.128 state farm, a few at west and southeast of No.127 state farm.