【摘要】 城市土壤特性的变化,不但影响城市生态环境,而且影响城市地下管线的安全,因此,为给城市土壤污染的修复治理,以及城市地下管网的防腐提供参考,本文以成都市工业用地为例,采用单因子污染指数法、单因子累积指数法和内梅罗综合指数法,对其土壤重金属环境质量现状进行调查和评价;同时采用评分法对其土壤腐蚀性进行评价。结果表明:成都市工业用地土壤采样点中Cd,Pb和Cr的含量分别介于未检出¹0.47mg·kg^-1,103.10mg·kg^-1156.35mg·kg^-1和39.55mg·kg^-1150.43mg·kg^-1之间,其中Pb和Cr均无超标现象,但Cd的超标率为10%,其单因子污染指数介于0.00¹0.47之间,个别采样点的Cd超标,导致成都市工业用地采样点土壤内梅罗综合污染指数为0.71,属于尚清洁（警戒限）水平。土壤中重金属Cd,Pb和Cr存在积累现象,除个别采样点Cd的单因子累积指数高达15.03和61.61外,其余的累计指数介于0⁵.73之间。根据方差分析,在成都市不同方位和不同圈层,工业用地土壤中Cd,Cr和Pb含量分布相对均匀,无显著性差异。成都市工业用地土壤采样点腐蚀性评分介于4.5¹0.5之间,腐蚀性为中等水平,在不同方位和不同圈层也均无显著性差异。综上所述,成都市工业用地个别土壤采样点中的Cd污染应引起相关部门的关注,而且在管网建设过程中,需做好相应的防腐措施。更多还原

【Abstract】 Soil characteristics not only influence ecosystems but also the security of underground pipe network in a city.The assessment of soil environmental quality and soil corrosivity is necessary for the remediation of soil contamination and the corrosion protection of buried steel pipelines in cities.The soil environmental quality of heavy metals in the industrial land of Chengdu city is surveyed and assessed by single factor pollution index method,single factor cumulative index method and Nemero comprehensive index method.Meanwhile,the soil corrosivity is assessed by grading method.It shows that the contents of cadmium,lead and chromium range from 0 to 10.47 mg·kg^-1,103.10 mg·kg^-1156.35 mg·kg^-1 and 39.55 mg·kg^-1150.43 mg·kg^-1 respectively.The contents of lead and chromium meet the standard of " Environmental Quality Standards for Soils",but the cadmium content of 10% samples exceeds the standard.The single factor pollution index of cadmium vary from 0¹0.47 and lead to the Nemero comprehensive index reaching to 0.71,which indicates that the soil contamination in the industrial land is moderately clean.However,the accumulations of cadmium,lead and chromium are obvious and their single factor cumulative index varies from 0 to 5.73 except two-sample cadmium contents which reach to 15.03 and 61.61 respectively.There is no significant difference of contents for heavy metals both in different directions of Chengdu city and in the different ring counties around the center city.The core of soil corrosivity is 4.5¹0.5 and the level of soil corrosivity is moderate.Also,the soil corrosivity is no significant difference in different directions and ring counties.Therefore,the cadmium contamination in the industrial land should be concerned by the local government in the two sampling points and the buried steel pipelines in Chengdu city should be protected by appropriate anti-corrosion measures.更多还原