城镇周边土壤中含铅矿物的环境意义  

Environmental significance of Pb bearing minerals in urban soil with heavy metal Pb anomaly

作　　者：汤丽玲[1] 马生明[1] 王之峰[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,中国地质科学院应用地球化学开放实验室,廊坊065000

出　　处：《物探化探计算技术》2014年第6期736-741,共6页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国地质科学院基本科研业务费资助项目(Ywf060724);物化探研究所基本科研业务费资助项目(AS2007J02)

摘　　要：通过对长江下游南京至苏州一带铅污染土壤中含铅矿物的鉴定识别和来源分析,确定土壤中铅的来源,既有附近含铅矿床开采过程中带出的含铅矿物,也有人为叠加的成分。作为相对稳定的含铅矿物,方铅矿、白铅矿和人工含铅颗粒含量越高,土壤中有效态铅所占比例就越低。对Pb异常土壤中含Pb矿物的研究,可以解释土壤与农作物籽实中铅含量间的复杂关系,同时也可以为生态地球化学评价标准和预测预警方案的制定提供参考。The environmental significance of Pb bearing minerals was studied in soil with heavy metal Pb anomaly around Nanjing to Suzhou at the lower reaches of Changjiang river.The results of mineral identification and source analysis showed that Pb deposits and anthropogenic activity pollution were the main sources of heavy metal Pb in urban soil.As heavy metal Pb in minerals was much inactive normally,galena,cerussite and manual-particles content showed opposite tendency to that of bio-available Pb in soil,which could explain the complex relationship between Pb content in crop and in soil.The evaluation criterion range of heavy metal Pb content in eco-geochemical assessment could be properly broadened according to the content of minerals in the area around Pb deposit or metal smelters.At the same time,it should be taken into account that heavy metal Pb in minerals could also be released in some extreme conditions such as low pH value.Forecast should be raised in order to prevent the environmental disaster produced by the activated heavy metal Pb in minerals.

关 键 词：铅污染土壤 含铅矿物 来源分析 生物有效性 环境意义 

分 类 号：X131.3[环境科学与工程—环境科学]