金坛市耕地重金属含量调查与评价

为了解金坛市耕地重金属污染状况。在2003年对金坛市4大农业区域土壤中Cr、Cu、Pb、Zn、Cd、Hg、As含量进行了测定和研究,并对该地区耕地质量进行了评价。金坛市土壤重金属含量的变幅较大,以Cd和Hg最为明显;不同农业区域土壤Cr、Pb含量存在显著性差异。与1990年江苏土壤元素背景值比较,该市土壤Cr、Hg、As含量超背景值的比例较低,在4.4%~18.9%,Cu、Pb、Zn、Cd含量超背景值的比例较高,达63.3%~97.8%;土壤重金属的相关性分析表明,土壤存在重金属复合污染的可能。该市土壤环境质量优良,受重金属污染较小。

Investigation and Evaluation of the Contents of the Heavy Metals in Cultivated Land in Jintan City

The objective of the research was to know the pollution status of heavy metals in the cultivated land in Jintan city.The contents of Cr,Cu,Pb,Zn,Cd,Hg and As in soil of 4 agricultural regions in Jintan city were determined,and the qualities of the cultivated land in these regions were evaluated.The variable amplitude of heavy metal content was larger in soils of Jintan city,with that of Cd and Hg being most obvious.The content of Cr and Pb had significant difference among different agricultural regions.Compared with the background value of soil element of Jintan city in 1990,the proportion of Cr,Hg and As content over the background values were lower,being at 4.4%～18.9%,while the proportion of Cu,Pb,Zn and Cd content over the background value was higher,being at 63.3%～97.8%.The correlation analysis of heavy metal in soil showed the compound pollution of heavy metal was possible in soil.The soil environmental quality in Jintan city was fine and the pollution from heavy metal was light.