Contamination assessment and spatial distribution of heavy metals in dust surrounding the Changqing town lead-zinc smelting plant in Baoji
宝鸡长青镇铅锌冶炼厂周围灰尘中重金属的空间分布及污染评价

The concentrations of heavy metals in dust samples surrounding the Changqing town lead-zinc smelting plant in Baoji city were measured by X-Ray fluorescence spectrometry. The contamination levels of heavy metals in dust were assessed based on the geo-accumulation index and the enrichment factor. The results show that the average concentrations of Cu, Pb, Zn, Cr, Ni and V in dust were 123.1, 1449.1, 2082.1, 1085.0, 40.8 and 81.8 mg·kg-1, respectively, which were higher than the corresponding background values of Shaanxi topsoil. The average concentrations of Cu, Pb, Zn, Cr, Ni and V in dust were respectively 5.8, 67.7, 30.0, 17.4, 1.4 and 1.2 times the corresponding background values of Shaanxi topsoil. The content of Cu, Pb, Zn, Cr and Ni in dust was the highest within 500 m of lead-zinc smelting plant. The assessment results showed that Cu, Pb, Zn and Cr had different contamination levels in dust around the lead-zinc smelting plant and the contaminated areas were mainly distributed in the northwest and southwest and southeast of lead-zinc smelting plant. The dust surrounding the Changqing lead-zinc smelting plant were not polluted by Ni and V.