【摘要】 大庆市是我国最大的陆上油田和重要的石油化工基地,开展重金属沉降通量及来源研究对于评估土壤重金属的来源及人类活动对土壤环境的影响具有重要意义。于2008年4月至次年4月采用被动采样技术共收集大气干湿沉降样品17份,配套土壤17份。通过AFS-230E原子荧光光度计法和ICP-AES全谱直读电感耦合等离子发射光谱法测试与分析了样品中的重金属含量,计算了沉降通量和富集因子。元素沉降通量与配套土壤的相关分析结果表明:Hg、Cd、As、Cr、Ni、Pb的沉降通量较低,而主要来源于人为污染源的Zn、Pb、As、Cd表现出较强或极强度的富集;土壤Zn、Cd的积累与大气沉降之间具有显著的相关关系。其他元素来源较为复杂,不同地区元素沉降通量之间差异显著。沉降量主要与城市地理位置、气候条件、人口数、工业结构、城市化水平等因素有关。更多还原

【Abstract】 In order to understand the characteristics of atmospheric heavy metal deposition in Daqing City,17 deposition samples were collected using passive sampling during April 2008 to April 2009.17 soil samples in the same places were also collected.The samples were analyzed for heavy metal concentration by Atomic Fluorescence Spectrometry(AFS) and Inductively Coupled Plasma-Atomic Spectrometry(ICP-AES).According to the calculating results,enrichment factors(EF) of Zn,Pb,As,Cd were significantly elevated compared with other elements(Hg,Cd,As,Cr,Ni and Pb).Correlation between deposition flux and content in soil was processed,and it shows significant correlation coefficient for both Zn and Cd,which indicates that the soil Zn and Cd contamination are attributed to atmospheric deposition.Comparison of the flux of heavy metals were carried out and it indicates large differences between districts,pointing out that the sources of atmospheric metal pollutants are related to geographical position,climate,humans population,the types and quantities of local enterprises and other anthropogenic sources.更多还原