钡盐厂周边土壤中钡及各形态钡的分布规律

贵州省天柱县某钡盐厂污染排放导致周边土壤遭受污染,为此对钡盐厂周边污染土壤进行采样分析。分析结果表明,钡盐厂周边土壤存在严重的钡富集,钡盐厂周边2km范围内土壤钡的浓度范围为760.4～3196mg.kg-1;污染区土壤表层钡的分布受污染源的距离关系及所在风向的控制,各形态钡占总钡平均比例大小关系为残渣态>Fe/Mn结合态>有机结合态>弱酸结合态;土壤剖面钡的分布规律为表层土壤中的总钡及各形态钡的含量远高于下层,总体呈垂直递减规律;钡及形态钡在土壤中的迁移转化规律受土壤pH、电导率、有机质、总氮以及碱解氮等诸多因素的影响。

Distribution of Barium and Barium Species in the Soil around a Barium Salt Factory

A study was conducted around a barium salt factory which discharged waste and polluted the soil around the factory in Tianzhu County,Guizhou Province.The results show there is a significant enrichment of barium,which ranges from 760.4 to 3196 mg·kg-1 within 2-km area around the factory.The spatial distribution reveals the concentrations of soil barium can be controlled by the distance from the factory and the wind direction.Barium was partitioned into four operationally defined chemical forms,with each form accounting for the proportion of the total content of barium in the order of residual form> Fe/Mn binding form> organic matter form> dilute acid combination form.In the soil profiles,the contents of total barium and barium species in surface layers are far higher than those in the lower levels,and show a vertical decline trend generally.The distribution regularity of barium in the soil is affected by such factors as pH,electrical conductivity,organic matter,total nitrogen,alkaline hydrolytic nitrogen,etc.