东莞麻涌农用地重金属的化学形态及生物效应

Chemical Speciation and Biological Effect of Heavy Metals in Agricultural Soil of Dongguan Machong

通过对东莞麻涌镇农用地重金属Cd、Cu、Ni、Pb总量及化学形态调查研究。结果显示,以国家土壤二级标准为参考,该目标地土壤Cd含量超标率达79.25%,Cu超标率达51.50%,Ni,Pb未超标。其中Cd离子交换态所占比例较大,达21.83%,Cu、Pb、Ni以残渣态为主。场地作物(菜心、通菜和葱)重金属含量测试结果表明,其含量结果与土壤中Cd、Cu、Ni、Pb各形态、总量之间存在不同程度的联系。

Total mass concentration and chemical speciation of Cd,Cu,Ni and Pb of the agricultural soil in Dongguan Machong were studied.The results showed that the contents of Cd and Cu in the soil samples exceeded the national soil standard grade Ⅱ 79.25％ and 51.5％,while the contents of Ni,Pb didn′t.Most of the Cd speciation was in ion exchange,reached to 21.83％,and Cu,Pb,Ni speciations were residua.Heavy metal contents in the field crops （cabbage,ipomoea and spring onions） were tested,and the results indicated that the heavy metals contents in crops were related to those in soils,to varying degree.