广州市蔬菜地土壤重金属污染状况调查及评价

探讨了广州市蔬菜地土壤重金属污染状况,测定了95份土壤样品中铅、镉、铬、砷、汞的含量水平。土壤中铅、镉、铬、砷、汞的含量分别在6.44～153.10mg/kg、0-0.682mg/kg、5.82～101.60mg/kg、0.04～45.36mg/kg、0.01～O.32mg/kg之间。就污染的普遍性而言,铅污染最为普遍,其次是砷污染;就污染的程度而言,镉污染最严重.其次为砷、汞。对比今昔污染变化.广州市土壤污染治理已取得显著成效,但仍需努力。土壤中镉、砷、汞三种元素的变异系数,特别是镉的变异系数较大,这可能预示着点源性污染的存在。

Investigation and evaluation on heavy metal pollution of vegetable farm soils in Guangzhou

The paper discussed the pollution of heavy metal in vegetable farm soils. The levels of lead, cadmium, chromium, arsenic and mercury in 95 soil samples obtained from vegetable farm soil in suburb of Guangzhou were detected. The levels of lead, cadmium, chromium, arsenic and mercury were 6.44-153.10 mg/kg, 0-0.682 mg/kg, 5.82-101.60 mg/kg, 0.04-45.36 mg/kg, and 0.01-0.32 mg/kg, respectively. At same time, we have done some evaluation for vegetable farm soils pollution of Guangzhou. The vegetable farm soils were contaminated by lead in great universality, and the next is arsenic. As for contaminated degree, cadmium-pollution is severe, and the second were arsenic and mercury. Pollution treatment of vegetable farm soils in Guangzhou have obtained obvious achievement, but it still make great efforts to eliminate all kings of heavy metal pollution. The higher coefficients of variation for the levels of cadmium, arsenic and mercury, especially for cadmium, predicted the existences of some point-polluted sources.