摘要
采用Tessier连续提取法对包头市不同区域的15个大气降尘样中镉的5种赋存形态进行了研究。结果表明,各形态含量占总镉百分比排序依次是:铁锰氧化物相>残渣相>碳酸盐相>强有机相>可交换相,5种形态占总镉的平均质量分数为铁锰氧化物结合态30%、残渣态24%、碳酸盐结合态19%,强有机结合态15%,可交换态10%;铁锰氧化物结合态是主要存在形态;铁锰氧化物结合态镉、有机结合态镉、残留态镉这三种形态镉生物有效性很低,但当环境改变时可能释放,应予以关注。汽油和煤的燃烧以及工厂排放镉能加大城市大气降尘的镉含量。
The speciation of Cd in 15 dustfall samples from Baotou city economic region was studied using Tessier extraction method.The results indicated that the distribution of speciation for Cd in dustfall was bound to Fe-Mn oxides residual bound to carbonates bound to organic exchangeable fraction.The bioactivity of exchangeable fraction and bound to carbonates forms are much higher than that of the other three forms.The percentage of exchangeable fraction and bound to carbonates fraction is 10 % and 19.%,respectively.The percentage of Cd bound to Fe-Mn oxides,bound to organic matters and residual is 30%,19%and 24% respectively.Attention should be given for Cd releasing when environment is changed.According to the determined data,coal and petrol burning can increase Cd content of dust fall of atmosphere in city.
出处
《内蒙古农业大学学报（自然科学版）》
CAS
北大核心
2010年第4期105-109,共5页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
内蒙古河套农业经济区生态地球化学调查项目资助(200414200005)
