Chemical Engineering Department, School of Chemistry, University of Murcia, 30071 Murcia, Spain.
Environ Monit Assess. 2012 Dec;184(12):7353-64. doi: 10.1007/s10661-011-2504-x.
Diffusive samplers were used to measure the vertical concentrations of benzene, toluene, n-hexane, cyclohexane, ethylbenzene and o-, m- and p-xylenes on both sides of two NS-oriented street canyons in Murcia (Spain) during a 5-day period. Non-dimensional relationships of concentration and height were calculated in order to study the behaviour of their concentration vertical profiles. The results show that the vertical profiles of benzene, toluene, n-hexane and cyclohexane concentrations were similar in both streets and on both sides of each street. Some differences were found in vertical profiles between streets and sides for ethylbenzene and xylenes, probably due to their higher affinity for adsorption into building materials. The similarities found for the first set of VOCs suggest that the dynamics of the dispersion was the same for both streets and was mainly influenced by microscale thermal effects. Finally, the concentration measurements of benzene, toluene, n-hexane, cyclohexane, and ethylbenzene were adjusted to expressions in the form c = c 0(h/h 0) A , and a regression coefficient R 2 = 0.962 (p = 0.0000) was obtained. The decreasing concentration of these compounds with height should be taken into account when assessing population exposure to these pollutants.
扩散采样器用于测量西班牙穆尔西亚市两条 NS 走向街道峡谷两侧五天内苯、甲苯、正己烷、环己烷、乙苯和邻、间、对二甲苯的垂直浓度。为了研究它们浓度垂直分布的行为，计算了浓度和高度的无量纲关系。结果表明，两条街道以及每条街道两侧的苯、甲苯、正己烷和环己烷浓度垂直分布相似。乙苯和二甲苯在街道和街道两侧的垂直分布存在一些差异，可能是因为它们对吸附到建筑材料中的亲和力更高。第一组 VOC 的相似性表明，两种街道的扩散动力学相同，主要受到微尺度热效应的影响。最后，对苯、甲苯、正己烷、环己烷和乙苯的浓度测量进行了调整，以 c=c0(h/h0)A 的形式表示，得到回归系数 R2=0.962(p=0.0000)。在评估人群对这些污染物的暴露时，应考虑这些化合物随高度降低的浓度。
