摘要
为了解贵阳郊区菜地土壤中重金属含量及污染状况,通过对贵阳南部近郊菜地47个土壤样品中Zn、Cd、Pb和Cu总量及有效态含量进行测定与分析,采用物元分析法对研究区菜地土壤重金属污染状况进行综合评估,并使用内梅罗综合污染指数法及潜在生态风险指数法对其评估结果进行对比分析。结果表明:菜地土壤样品中重金属Zn、Pb和Cu总量超出贵州省土壤环境背景含量的比例分别为36.17%、97.87%和65.96%,分别有10.64%和17.02%样点Zn和Cu总量超出国家土壤环境质量Ⅱ级标准的限值;相关性分析显示Zn与Cd、Pb与Cu可能有相似来源,各重金属元素总量和有效态含量的高低并不完全契合;物元分析结果表明,研究区有78.72%样点处于Ⅰ级(无污染),14.89%样点处于Ⅱ级(轻度污染),10.64%样点处于Ⅲ级(中度污染)水平。物元分析法既考虑到土壤重金属污染的特性,又兼顾了污染物的浓度和毒性,综合分析认为,物元分析评价结果更为客观合理。
To ascertain the heavy metal pollution in vegetable farming soils in the suburbs of Guiyang,Guizhou,South China,47 soil samples were collected from the area and determined the total amounts and the effective species contents of heavy metal elements including Zn,Cd,Pb,and Cu.The matter elements were analyzed to evaluate the pollution status comprehensively.The evaluation results were then analyzed using the Nemerow comprehensive pollution indices and the potential ecological risk index.The matter element analysis considered not only the characteristics of heavy metal pollution in soil,but also the concentration and toxicity of the pollutants.Results show that the total contents of Zn,Pb,and Cu in the vegetable soil exceeded the provincial benchmarks of soil environmental background,accounting for 36.17%,97.87%,and 65.96%,respectively;and 10.64%and 17.02%of the samples exceeded the national benchmarks of soil environmental GradeⅡin total content of Zn and Cu,respectively.Correlation analysis showed that Zn and Cd,and Pb and Cu might share a similar source,and the total and the available contents of the heavy metals did not agree entirely.The matter element analysis showed that 78.72%of the samples qualified for Grade I(non-pollution),14.89%for Grade II(mild pollution),and 10.64%for Grade III(moderate pollution).It is believed that the results of matter element analysis are objective and reasonable.
作者
李丁
王济
宣斌
蔡雄飞
赵士杰
LI Ding;WANG Ji;XUAN Bin;CAI Xiong-fei;ZHAO Shi-jie(School of Geographic and Environmental Science,Guizhou Normal University,Guiyang 550025,China)
出处
《科学技术与工程》
北大核心
2020年第1期397-405,共9页
Science Technology and Engineering
基金
贵州省科技支撑计划(黔科合支撑[2017]2580)
贵州省科学技术基金重点项目(黔科合JZ字[2014]2012号)
关键词
菜地
重金属
物元分析
土壤评价
vegetable soil
heavy metals
matter element analysis
soil evaluation
作者简介
第一作者:李丁(1994-),男,汉族,河北宁晋人,硕士研究生。研究方向:土壤重金属污染与修复。E-mail:iamliding@126.com。通信作者:王济(1975-),男,汉族,贵州黔西人,博士,教授。研究方向:土壤重金属污染与修复。E-mail:wangji@gznu.edu.cn。
