徐州城市路边表层土壤Pb,Cu和Zn污染的磁化率表征

Correlation between Magnetic Susceptibility and Pb,Cu and Zn Concentrations in Xuzhou Urban Roadside Topsoil

比较系统地采集了徐州城市主要干道的路边表层土壤样品20件,分析了土壤样品中Pb,Cu和Zn的含量,测定了样品的磁化率。结果表明,土壤样品的质量磁化率与Pb,Cu和Zn含量呈显著相关,指示Pb,Cu和Zn与磁性矿物有着相同的人为源;污染负荷指数与质量磁化率也呈显著相关;最后,提出了Pb,Cu和Zn污染的土壤磁化率诊断模型:频率磁化率<3%且质量磁化率>地区背景值。磁化率测量可以作为一种快速、经济以及对样品无破坏性的方法用于监测城市路边表层土壤中Pb,Cu和Zn的污染状况。

Concentrations of Pb, Cu and Zn and values of magnetic susceptibility were measured on 20 topsoil samples collected from roadside areas in the city of Xuzhou. The result shows that a strong correlation has been found between the heavy metals Pb, Cu and Zn and magnetic susceptibility, and an anthropogenic contamination origin is thought to be the cause. A significant correlation has also been observed between pollution loading index （PLI） and magnetic susceptibility. Soils containing elevated concentrations of Pb, Cu and Zn are identified using two criteria：Х （values 〉 magnetic susceptibility regional background） and Хfd （values 〈 3%）. The present study suggests that magnetic susceptibility is a fast, inexpensive and non-destructive method for the detection of Pb, Cu and Zn in Xuzhou urban roadside topsoil.