摘要
目的 研究某铅锌冶炼企业周围14km以内土壤的不同深度土层中重金属含量差异,评价其周围土壤是否受到污染,为企业环保评估和污染治理提供参考。方法 以某铅锌冶炼企业周围14km以内的12个村庄土壤样本为例,研究不同深度土壤中Pb,Cd,Zn和Hg的含量,与相关背景值进行比较,评价该冶炼企业对周边土壤的重金属污染状况及其富集规律。结果 分析结果表明,该冶炼厂厂界及周边土壤中4种元素均有不同程度的超标。地积累指数（Igeo）计算结果表明,该冶炼厂周边村庄土壤中Pb呈现偏中度污染,Zn属于轻度污染,而Cd和Hg则无污染迹象。相关性分析表明,Pb,Cd和Hg呈现显著正相关。土壤不同深度剖面重金属含量差异表明,Cd易在厂界20~50cm深度的土壤中富集,且在村庄浅表层（≤2cm）土壤中富集明显;Pb易在附近4个村庄（村庄6#,7#,8#,9#）表层土壤中富集。结论 该企业已经对周围土壤造成重金属污染,当务之急是加强企业环保评估和综合治理,同时对农产品食物链的污染有待深入研究。
Objective--To provide a reference for the assessment of enterprises＇environmental pro- tection and pollution treatment by studying the deference in heavy metal contents in the soil at differ- ent depths within 14 km around a lead-zinc smelting enterprise and by evaluating whether the soil around the aforesaid enterprise is polluted. Methods--Taking the soil of 12 villages within 14 km a- round some lead-zinc smelting enterprise as an example, the contents of Pb, Cd, Zn and Hg in the soil at different depths were studied, then pollution status of heavy metals and enrichment regularity in the soil around some smelting enterprise was assessed by comparing with the related background val- ue. Results--The results showed that the 4 kinds of heavy elements in the soil around and at boundary of some lead-zinc smelting enterprise were found excessive in varying degrees. The calculated result of geo-accumulation index （Igeo） showed that Pb in the soil of villages near the smelter was found moder- ately polluted, Zn slightly polluted, while there isn＇t a sign of the pollution of Cd and Hg. Correlation analysis showed that there were significant positive correlation among Pb, Cd and Hg. Spatial differ- entiation of soil heavy metal indicated that Cd was easy to concentrate at 20--50 cm of soil within the factory boundary and 0-2 cm of shallow surface soil around the villages, and element Pb was easy toconcentrate at the surface soil of 4 villages （village 6, 7, 8, 9） near the smelter. Conclusion--The en- terprise has heavily polluted the soil around it, so it is urgent matter to strengthen the enterprise＇s en- vironmental assessment and comprehensive management and the contamination caused to agricultural food chain by the enterprise is expected to be further researched.
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2015年第3期27-33,共7页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
关键词
土壤污染
铅锌冶炼厂
重金属富集
soil pollution
lead-zinc smelter
heavy metal enrichment
