铅锌冶炼厂周边土壤铅源的铅同位素示踪

Study of the Lead Source in the Surrounding Soil of the Lead-zinc Smelters by Isotope Tracing

以某铅锌冶炼厂周边土壤为研究对象,通过对其原料及周边土壤中铅含量的检测,结果显示:该冶炼厂周边土壤铅质量比在22.73 mg/kg^126.51 mg/kg之间,平均值为42.68 mg/kg,是当地土壤铅背景值的1.85倍。采用铅质量比空间分布分析和同位素混合模型计算分析了冶炼厂周边土壤中铅的可能来源,分析表明:土壤铅质量比的空间分布及铅同位素比值与冶炼厂的焦化原料煤相近,焦化原料煤对周边土壤铅污染贡献最大。

Taken the soil samples nearby a lead-zinc smelter as the research object,the lead content of the lead-zinc ore, the metallurgical coal and the nearby soil were detected. It was concluded that lead content in the soil surrounding the lead-zinc smelter varied from 22.73 mg/kg to 126.51 mg/kg,and the average content was 42.68 mg/kg which was higher by a factor of 1.85 than the local soil background level. Meanwhile the possible contamination sources were analyzed by means of the spatial variability analysis and the lead isotope mixed model tbrmula. It was concluded that the spatial distribution of soil heavy metal nearby the lead-zinc smelter and the lead isotope rates were close to the metallurgical coal and so that the metallurgical coal was the largest contribution to the soil pollution.