乌鲁木齐市典型城区大气PAHs气-粒分配特征
发布时间:2018-10-09 19:28
【摘要】:大气中PAHs的气-粒分配是影响其在大气中分布、迁移和转化的一个重要因素,于2011年12月—2012年12月在乌鲁木齐市天山区采集大气气相和颗粒相样品,对聚氨酯泡沫样品的气相和石英纤维膜的颗粒相(TSP)中的16种PAHs进行分析.结果表明:采样期间颗粒相和气相中ρ(∑16PAHs)总和的年均值为(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;采暖期颗粒相中ρ(∑16PAHs)平均值为(40.60±3.03)ng/m3,气相为(134.46±13.05)ng/m3,2~3环PAHs主要存在于在气相中,4~6环PAHs主要存在于颗粒相中.在非采暖期,颗粒相ρ(∑16PAHs)平均值为(25.37±3.21)ng/m3,气相为(14.95±1.06)ng/m3.采用吸附和吸收模型对PAHs的分配特征进行了研究,表明PAHs的lg Kp(Kp为分配系数)与lg PL0(PL0为过冷蒸汽压)线性关系显著,在采暖期斜率绝对值为0.34,说明PAHs的气-粒分配以吸收为主;在非采暖期的斜率绝对值为0.78,表明PAHs的气-粒分配受吸收和吸附共同作用.PAHs的lg Kp与lg Koa(Koa为正辛醇-大气分配系数)线性关系显著,在采暖期斜率为0.38,表明PAHs气-粒分配并未达到平衡;在非采暖期,斜率为1.22,表明PAHs气-粒分配接近平衡.研究显示,乌鲁木齐市城区大气PAHs气-粒分配在采暖期及非采暖期特征不同,应区别制订政策和管理措施.
[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,
本文编号: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,
本文编号:2260509
本文链接:https://www.wllwen.com/kejilunwen/huanjinggongchenglunwen/2260509.html
最近更新
教材专著