福建省泉州湾大气降尘中的重金属元素的沉降特征

2004年7月-2005年7月分季度对泉州湾大气降尘样品进行采集.利用ICP-AES对降尘中重金属元素含量进行了测定并利用ICP-MS对样品中Pb同位素组成进行了分析.通过对不同重金属元素的年沉降通量的计算及与国内外其他研究区的对比发现,泉州地区大气降尘已经受到一定程度的重金属污染,但与国内经济发达地区相比空气质量相对较好.Pb同位素研究表明,人们的生产活动可能是大气沉降中Pb污染的主要来源.富集因子的计算表明,Cd,Pb,Zn,Cr,Cu和Ni明显受到人为活动的影响.人们的生产活动、化石燃料的燃烧、污染土壤风化过程等可能是大气降尘中重金属的主要来源.

Precipitation Characteristics of Heavy Metal in Dustfall to Quanzhou Bay of Fujian Province

Samples of dusffall were collected from July 2004 to July 2005 every three month. Heavy metals were analysed using ICP-AES and the composition of Pb isotopes analysed using ICP-MS. Annual flux of atmospheric deposition was calculated and compared with other sites, it is found that dusffalls to Quanzhou Bay have been contaminated by heavy metals, but compared with other well developed sites in China, Quanzhou Bay is still in a relatively better condition. The composition of Pb isotope indicates that the pollution of Pb is mainly caused by anthropogenie sources. The enrichment factors of different elements show that Cd, Pb, Zn, Cr, Cu and Ni are seriously impacted by human aetivity. Activity of production, combustion of fossil fuel, and weathering processes of contaminated soil are the main sources of heavy metal in dusffall.