鄂西山区表层土壤重金属元素背景值研究

Background Value of Heavy Metal Elements in Surface Soil of Mountainous Area in Western Hubei

基于1∶25万多目标地球化学调查工作,分析检测鄂西恩施地区中高山区4275件土壤样品,提出鄂西山区表层土壤(0~20 cm)重金属元素的背景值。研究结果表明,鄂西山区表层土壤中As的推荐背景值为13.2 mg/kg,Cd为0.46 mg/kg,Cr为86 mg/kg,Cu为32 mg/kg,Ni为38 mg/kg,Hg为0.110 mg/kg,Pb为34 mg/kg,Zn为99 mg/kg。与1990年发布的湖北省土壤环境背景值相比,研究提出的鄂西山区表层土壤的As、Cr、Cu、Ni背景值与其差异不大,Cd背景值提高2.67倍,Hg、Pb、Zn背景值提高18.6%~37.4%。研究成果可为鄂西山区土壤环境质量评价和土地科学管理提供新的基础数据。

Based on the 1∶250000 multi-objective geochemical survey,4275 soil samples from middle and high mountainous area in Enshi area of western Hubei are analyzed and tested,and the background values of heavy metals in surface soil(0~20 cm)of western Hubei were proposed.The results show that the recommended background values of As,Cd,Cr,Cu,Ni,Hg,Pb and Zn are 13.2 mg/kg,0.46 mg/kg,86 mg/kg,32 mg/kg,38 mg/kg,0.110 mg/kg,34 mg/kg and 99 mg/kg,respectively.Compared with the background values of soil environment in Hubei Province published in 1990,the background values of As,Cr,Cu and Ni in the surface soil of mountainous areas in western Hubei Province are not significantly different from them.The background value of Cd is increased by 2.67 times,and the background values of Hg,Pb and Zn are increased by 18.6%~37.4%.The study can provide new and reliable basic data for soil environmental quality evaluation and land scientific management in mountainous areas of western Hubei Province.