不同粒级土壤磁化率与重金属污染特征的相关关系

采集辽宁省葫芦岛锌厂周边农田耕作层土壤,将其分为>500 μm、100~500 μm、50~100 μm、2~50 μm、χlf)和高频磁化率(χhf),用BCR连续提取法对5个粒级及未分级土样中的Pb和Cd赋存形态进行分析,并计算各粒级土壤污染负荷指数(PLI)和频率磁化率(χfd)等参数,以此探讨不同粒级土壤磁性与Pb和Cd含量、形态及PLI的关系.结果表明,粒径 χfd均增加;各个粒级土壤中Pb的可还原态(F2)含量高于其他形态,而Cd的弱酸可溶态(F1)含量高于其他形态;未分级土壤中Pb含量、Cd含量和PLI与χlf和χfd具有显著相关性,且均在0.05水平及以上;各个粒级土壤中Pb和Cd的F2含量与χlf、χfd和PLI基本达0.01水平显著相关,其显著性均高于其他形态含量与χlf、 χfd和PLI的显著性.

Correlation between magnetic susceptibility and contents of heavy metals in contaminated-soil of different particle-size fractions

In order to investigate the correlation between heavy metal contents and magnetic susceptibility of contaminated-soil with different particle-size fractions. Soils were sampled from 0—20 cm layer of a cultivated land near a zinc refinery plant in Huludao city, Liaoning. Soils were partitioned into five size fractions(>500 μm, 100—500 μm, 50—100 μm, 2—50 μm, and χfd) and other parameters were also calculated. The results showed that the contents of Pb and Cd, PLI, χfd tended to increase with the particle size decreased when the particle diameter χlf and χfd at the level of P=0.05. There was very significant positive correlation between the content of reducible Pb and Cd and χlf, χfd, PLI at the level of P=0.01.