【摘要】 通过对合肥市周边中心城镇大兴镇的标准农田的调查研究,发现土壤中As、Cd、Cr、Pb、Cu、Zn、Ni几何均值基本位于背景值附近,土壤Hg质量比全部超过背景值,其质量比的几何平均值(0.067 mg/kg)为背景值(0.030 6 mg/kg)的2.2倍,重金属Hg、Cr、Pb、Cu都存在着积累现象(超过基线值),但污染程度相对较轻,超标率都为3.33%;其他元素没有发现污染问题。研究结果表明,本区土壤重金属的累积只是由于农业生产活动的原因而有所增加,Hg、Cd是该区土壤中需要优先控制的重金属。更多还原

【Abstract】 To identify the pollution risks,30 samples of root-zone soil were collected from the standard farmland in Daxing Town,Hefei City.The results indicate that the geometric means of As,Cd,Cr,Pb,Cu,Zn and Ni are basically around background levels.The concentration of mercury exceeded its background concentration(0.030 6 mg/kg),and its geometric mean which was 0.067 mg/kg is 2.2 times higher than its background concentration.Meanwhile,only 3.33% of soil samples had higher concentrations than the baselines of Hg,Cr,Pb and Cu,respectively.No obvious accumulations of other heavy metals in the soil were observed in the study area.It can be concluded that the human factor is an important factor of the accumulation of heavy metals in the root-zone soil.Consequently,Hg and Cd,which are the priorities of the pollutants,should be frequently monitored and closely regulated in the Daxing standard farmland in Hefei City.更多还原