北京市西北城区大气PM_(10)中酞酸酯的分布特征

DISTRIBUTION OF THE PHTHALATE ESTERS IN PM_(10) OF NORTHWESTERN URBAN AREA IN BEIJING

使用大流量TSP-PM10采样仪在北京市西北城区采集了2001年取暖期与2002年非取暖期的大气可吸入颗粒物(PM10)样品。使用CHCl3对样品中的可溶有机物进行抽提分离,并采用内外标结合法利用气相色谱/质谱对分离出来的非烃类化合物酞酸酯进行了定量分析。结果表明:取暖季节大气PM10中酞酸酯类化合物的污染,平均质量浓度为15223.21ng/m3,远远大于非取暖季节酞酸酯的污染,平均质量浓度为4442.27ng/m3。与国内外其他城市相比较可以得知,北京市西北城区大气PM10中酞酸酯类化合物的污染,如取暖期内大气颗粒物中邻苯二甲酸二辛酯的浓度为7363.38ng/m3,不仅大于国外其他污染较轻的城市,而且还要大于北京市往年酞酸酯类化合物的浓度。

The airborne particles(PM_ 10)have been collected using the high-volume TSP-PM_ 10 sampler(XH1000)in the northwestern urban area in Beijing during heating Period in 2001 and non-heating period in 2002.Extractable organic matter(EOM)has been extracted with CHCl_3.The quantitative analysis of the phthalate esters has been carried out with the integrated internal and external standards.The results suggest that the average mass concentrations of the phthalate esters in heating period(15 223.21 ng/m3)were much higher than in non-heating period(4 442.27 ng/m3).Compared with other cities in the world,the pollutions of the phthalate esters in northwestern urban area in Beijing were much more serious.For example,the concentration of the dioctyl phthalates in northewestern urban area in Beijing was 7363.38 ng/m3 in heating period,and this was not only higher than that in other countries,but also higher than that of previous years in Beijing.