摘要
分析了成都市近地表大气尘样品铅及其同位素含量比的测定数据，铅含量变化范围为（119．76～1327．42）×10^-6，均值为374．51×10^-6，统计标准偏差为273．36，变异系数为0．73，说明成都市近地表大气尘铅含量变化大。燃煤飞灰的放射性成因铅明显高于汽油和柴油，可作为鉴别大气尘铅来源的证据。铅同位素含量数据表明成都市近地表大气尘的铅污染是复合污染源所致，其中，相对清洁区污染以建筑扬尘为主，中度污染区是汽车尾气和扬尘的叠加作用，重污染区是燃煤飞灰汽车尾气和工业污染源的综合表征。
Based on analyzing the data of some elements （including lead） and lead abundance ratio in air dust near the ground surface in Chengdu City, this paper has reached the conclusion that lead pollution is heavy. The spatial distribution of aerosol lead varies remarkably in the range from 119.76 × 10^-6 to 1327.42 × 10^-6 with an average of 374.51 × 10^-6, SD of 273.36 and CV of 0. 730. The radiogenic lead of coal fly ash is obviously higher than that of gasoline and diesel oil, which can serve as the discrimination criterion to distinguish the aerosol lead sources. The data of lead isotopic compositions of aerosol lead show that the pollution is caused by multiple pollution sources, with the relatively clean area mainly by construction and soil dust, the moderately polluted area chiefly by automotive emissions and dust, and the heavily polluted area predominantly by coal fly ash, automotive emissions and industrial pollutions.
出处
《物探与化探》
CAS
CSCD
2006年第2期104-107,共4页
Geophysical and Geochemical Exploration
基金
中国地质调查局地质调查项目(200314200015)资助
关键词
成都
近地表大气尘
铅分布特征
铅同位素含量比
铅污染源
Chengdu
air dust near the ground surface
lead distribution characteristics
lead isotope abundance ratio
lead pollutionsource
