青海民和-海石湾一带重金属异常源初探

Diagnosis of the Anomaly Source of Heavy Metals in Soil Around the Minhe-Haishiwan Area,Qinghai

利用青海省海东地区多目标地球化学调查获取的大量数据,通过先相关分析再因子分析等多元统计分析方法,对造成青海省民和-海石湾一带表层土壤中Cd、Cr、Hg、Pb四种元素大面积异常的原因进行初步分析。结果表明,Cd、Hg、Pb这三种重金属异常主要与当地的工业生产、交通运输等人类活动有关;而Cr元素不仅与人类的生产生活活动有关,还与成土母质固有的地球化学特性关系密切。废渣、煤屑对异常的形成影响有限,工业废气、燃煤、机动车尾气等产生的大气降尘、扬尘等是主要的异常源。这为生态评价和污染防治提供了重要参考。

Based on the data obtained by multi-purpose regional geochemical survey in the Haidong area,Qinghai,a study was carried out to find out the cause of heavy metal anomalies in large area in the soil around the Minhe-Haishiwan area,Qinghai,by using correlation analysis and then factor analysis.It was suggested that human activities,like industrial production and transportation,caused the anomalies of heavy metals such as Cd,Hg and Pb on the soil surface;Cr was not only related to human activities,but also to the inherent geochemical characteristics of the parent materials in the soil.Slag,coal dust had limited impact on the formation of heavy metal anomalies in large area;while atmospheric dust produced by industrial emission,coal burning and motor vehicle exhaust,was the main source of anomalies.This study provided important reference for eco-environmental assessment and pollution prevention.