忻州市忻府区灌区土壤重金属形态分析及生态风险评价

通过野外采样调查和实验分析,对忻州市忻府区灌区土壤中Cu、Zn、Cr、Ni、Pb的含量和化学形态进行了分析,并对灌区土壤重金属污染进行了风险评价。结果表明:忻府区灌区土壤中Zn、Cr、Ni、Pb的含量高于土壤环境背景值,但低于国家二级标准,Cu的含量低于土壤环境背景值;灌区土壤中Zn、Cr、Ni主要以残余态为主,Cu有机结合态所占比例最高,Pb铁锰氧化物结合态所占比例最高;忻府区灌区生态风险等级为B级,生态风险性较轻,土壤Pb的潜在生态危害性较高,应作为忻府区灌区土壤中优先控制的重金属。

Integrate Risk Assessment and Species Distribution of Heavy Metals in Sewage-irrigated Soil in Xinfu of Xinzhou

Soil samples were collected in sewage-irrigated soil in Xinfu of Xinzhou to study the speciation of heavy metals and to evaluate the contamination situation of heavy metals.The results showed that： total heavy metals of Zn、Cr、Ni、Pb were higher than the environmental background values of Shanxi,but total heavy metals of Cu was lower than the environmental background values of Beijing.Zn、Cr and Ni in sewage soil were dominated by the residue fraction,Cu were dominated by organic matter fraction,Pb were dominated by iron-manganese oxides fraction.The latent ecological risk index and classification of sewage soil was B and the potenial ecological risk of Pb was higher than other heavy metals,Pb was the priority metal to be controlled.