摘要
采用分级采样器采集大气中微小颗粒物中的汞,用冷原子吸收测汞仪分析。结果表明,颗粒态汞浓度随粒径分布呈双峰型,2个峰值分别出现在粒径1.0μm和4.0μm左右,与水溶性离子,碳含量的粒径分布基本一致。PM_(1.6)、PM_(8)和TSP中颗粒态汞的浓度分别为0.150、0.273、0.429ng/m^3,汞的质量分数分别为3.75.1.09、1.07μg/g,高于背景参考值;结果还表明,颗粒态汞主要集中在细颗粒中。通过正态概率分布测算,PM_(1.6)、PM_(6)中汞主要来自于1个主体源;PM_(1.6)中汞的浓度与硫酸根离子呈显著性相关,而与硝酸根离子、氯离子则不显著相关:说明颗粒物中汞的主要来源可能与燃煤有关。
Two cascade impactors were used to collect par-ticulate mercury in inhalable particles. Size distribution of particulate mercury have two peaks, which occur around 1 μm and 4 μm respectively, similar to that of water-soluble ions and total carbon content. Concentrations of particulate mercury in PM1.6、PM8 and TSP were 0.150ng/m3、0.273ng/m3、0.429ng/m3 respectively, the contents in PM1.6.PM8 and TSP were about 3.75μg/g、1.09μg/g、1.07μg/g respectively which were all higher than those of background. The results indicated that particulate mercury mainly concentrated on fine particles. Through investigating normal probability distribution of mercury in PM1.6, PM8, mercury may result from single source. Particulate mercury has a strong link to sulfate in PM1.6, while didn't correlate strongly to nitrate, fluoride and chloride, thus coal burning may be the predominant source of particulate mercury.
出处
《上海环境科学》
CAS
CSSCI
CSCD
北大核心
2003年第5期310-312,316,共4页
Shanghai Environmental Sciences
关键词
大气污染
微小颗粒物
汞
污染特性
上海
粒径分布
Participate mercury Fine particle Size distribution Resource identification Shanghai
