贵阳城区垃圾站周边地表灰尘重金属水平及季节分异

以贵阳城区垃圾转运站为研究对象,分别于夏季(7月)和冬季(2月)在垃圾站周边采集灰尘样品共26个,研究垃圾转运站地表灰尘重金属水平及冬、夏季节分布规律。结果显示,贵阳市城区垃圾站地表灰尘As、Cd、Cu、Ni、Pb和Zn的几何平均值分别为19.8、0.975、156、43.4、99.1和416mg/kg,与贵州省土壤背景值相比,Cd、Cu和Pb累积较重,As和Ni累积较轻。位于次级街道的垃圾站地表灰尘重金属水平显著高于位于城市主干道的垃圾站,垃圾站周边环境和清洁程度的不同可能是导致地表灰尘重金属空间差异的主要原因。贵阳市城区垃圾站灰尘重金属冬、夏季节分异总体表现不明显,但位于次级街道的垃圾站地表灰尘Cd和Pb含量冬季高于夏季。

The Pollution Status of Dust Heavy Metals around Refuse Transfer Stations in Guiyang City

A survey was conducted to investigate the content distribution of heavy metals in dusts around garbage stations in Guiyang based on 26 dust samples collected in summer and winter.The results showed that the geometric concentrations of As,Cd,Cu,Ni,Pb and Zn around garbage stations in Guiyang were 19.8,0.975,156,43.4,99.1 and 416 mg/kg,respectively.Compared to the elemental background values of Guizhou soil,the data showed that Cd,Cu and Zn were relatively heavily accumulated while As and Ni were slightly accumulated.The garbage stations located in secondary streets had higher heavy metal concentrations in dust than those located in main thoroughfares,which were mainly conducted by different environments and the cleaning state of these garbage stations.For all garbage stations,there was no significant difference in heavy metal concentrations in summer and winter,while the garbage stations located in the secondary streets had higher concentrations of Cd and Pb in winter than in summer.