摘要
2011年8月—2012年7月期间，利用中流量（100 L·min^-1）大气采样器对东莞市A和B两点（A：生活区，B：工业区）进行PM1、PM1-2.5、PM2.5-10采样，并定量分析颗粒物上F^-、Cl^-、NO3^-、SO4^2-、NH4^＋、Na^＋、K^＋、Ca^2＋、Mg^2＋等9种水溶性无机离子.分析结果显示，工业区B点的细粒子污染较生活区A点严重，B点PM1质量浓度年均值为48 μg·m^-3，其浓度是A点的1.2倍.A、B两点PM1对PM2.5和PM10的质量贡献率无明显差异，平均贡献率分别高达69%和45%.二次离子SO4^2-、NO3^-、NH4^＋及与燃烧行为有关的K^＋、Cl^-等5种离子在细粒子PM1上富集，这5种离子对PM1质量的贡献率分别为18.82%-19.76%、4.98%-5.47%、3.98%-4.12%、2.03%-2.27%和3.39%-3.78%.而其他4种离子，Ca^2＋、Mg^2＋、F^-和Na^＋积聚在粗粒子PM2.5-10上.PM10/PM2.5/PM1三种粒子中，PM1粒子酸性值AE/CE（阴离子当量浓度/阳离子当量浓度）比值和硫转化率SOR、氮转化率NOR值均是最高.
PM1、PM1-2.5、PM2.5-10 samples were collected simultaneously using medium-volume samplers at commercial/residential area （A site） and industrial area （B site） in Dongguan city from August 2011 to July 2012. With respect to the analysis of nine kinds of water-soluble inorganic ions （i.e. F^-, Cl^-, NO3^-, SO4^2-, NH4^＋, Na^＋, K^＋, Mg^2＋ and Ca^2＋）, it was concluded that the pollution of fine particle at B site was more serious than that at A site. An annual average mass concentration of PM1 at B site was 48 μg·m^-3, which was 1.2 times the value of A. The difference in mass contributions of PM1 to PM2.5 and PM10 at A and B site was not obvious, with values of 69% and 45%, respectively. Secondary ions of NO3^-, SO4^2- and NH4^＋, and K^＋ and Cl^-, indicators of combustion, were all concentrated in submicron particle PM1, with contribution ratios to PM1 mass of 18.82%-19.76%, 4.98%-5.47%、3.98%-4.12%, 2.03%-2.27% and 3.39%-3.78%, respectively. Moreover, the other four ions, i.e. Ca2＋, Mg2＋, F-and Na＋, were concentrated in coarse particle PM2.5-10. With respect to the three particles PM10, PM2.5 and PM1, the values of AE/CE ratios, SOR and NOR of PM1 were the highest.
出处
《环境科学学报》
CAS
CSCD
北大核心
2014年第1期27-35,共9页
Acta Scientiae Circumstantiae
基金
东莞市环境保护局一般专项(No.B11A07006201017)
东莞市高等院校科研机构科技计划项目(No.2011108102040)~~
