烏魯木齊市典型城區(qū)大氣PAHs氣-粒分配特征
發(fā)布時間:2018-10-09 19:28
【摘要】:大氣中PAHs的氣-粒分配是影響其在大氣中分布、遷移和轉(zhuǎn)化的一個重要因素,于2011年12月—2012年12月在烏魯木齊市天山區(qū)采集大氣氣相和顆粒相樣品,對聚氨酯泡沫樣品的氣相和石英纖維膜的顆粒相(TSP)中的16種PAHs進行分析.結(jié)果表明:采樣期間顆粒相和氣相中ρ(∑16PAHs)總和的年均值為(116.71±92.74)ng/m3,采暖期〔(173.16±84.26)ng/m3〕是非采暖期〔(39.46±16.19)ng/m3〕的4.4倍;采暖期顆粒相中ρ(∑16PAHs)平均值為(40.60±3.03)ng/m3,氣相為(134.46±13.05)ng/m3,2~3環(huán)PAHs主要存在于在氣相中,4~6環(huán)PAHs主要存在于顆粒相中.在非采暖期,顆粒相ρ(∑16PAHs)平均值為(25.37±3.21)ng/m3,氣相為(14.95±1.06)ng/m3.采用吸附和吸收模型對PAHs的分配特征進行了研究,表明PAHs的lg Kp(Kp為分配系數(shù))與lg PL0(PL0為過冷蒸汽壓)線性關(guān)系顯著,在采暖期斜率絕對值為0.34,說明PAHs的氣-粒分配以吸收為主;在非采暖期的斜率絕對值為0.78,表明PAHs的氣-粒分配受吸收和吸附共同作用.PAHs的lg Kp與lg Koa(Koa為正辛醇-大氣分配系數(shù))線性關(guān)系顯著,在采暖期斜率為0.38,表明PAHs氣-粒分配并未達到平衡;在非采暖期,斜率為1.22,表明PAHs氣-粒分配接近平衡.研究顯示,烏魯木齊市城區(qū)大氣PAHs氣-粒分配在采暖期及非采暖期特征不同,應區(qū)別制訂政策和管理措施.
[Abstract]:The gas-particle distribution of PAHs in the atmosphere is an important factor affecting its distribution, migration and transformation. Samples of atmospheric vapor and granular phase were collected from December 2011 to December 2012 in Tianshan District, Urumqi City. The gas phase of polyurethane foam and 16 kinds of PAHs in granular phase (TSP) of quartz fiber membrane were analyzed. The results show that the annual mean of 蟻 (鈭,
本文編號:2260509
[Abstract]:The gas-particle distribution of PAHs in the atmosphere is an important factor affecting its distribution, migration and transformation. Samples of atmospheric vapor and granular phase were collected from December 2011 to December 2012 in Tianshan District, Urumqi City. The gas phase of polyurethane foam and 16 kinds of PAHs in granular phase (TSP) of quartz fiber membrane were analyzed. The results show that the annual mean of 蟻 (鈭,
本文編號:2260509
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