Liu Xiaofeng, Peng Lin, Bai Huiling, Mu Ling, Song Chongfang
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, People's Republic of China.
Environ Geochem Health. 2014 Jun;36(3):531-42. doi: 10.1007/s10653-013-9579-y. Epub 2013 Nov 20.
The purpose of this study was to characterize the occurrence and size distributions of ten species of polycyclic aromatic hydrocarbons (PAHs) in the ambient air of coking plants. Particulate-matter samples of four size fractions, including ≤2.1, 2.1-4.2, 4.2-10.2, and ≥10.2 μm, were collected using a Staplex234 cascade impactor during August 2009 at two coking plants in Shanxi, China. The PAHs were analyzed by a gas chromatograph equipped with a mass-selective detector. The concentrations of total particulate-matter PAHs were 1,412.7 and 2,241.1 ng/m(3) for plants I and II, and the distributions showed a peak within the 0.1-2.1 μm size range for plant I and the 0.1-4.2 μm for plant II. The size distributions of individual PAHs (except fluoranthene) exhibited a considerable peak within the 0.1-2.1 μm size range in coking plant I, which can be explained by the gas-particle partition mechanism. The ambient air of the coking plant was heavily polluted by PAHs associated with fine particles (≤2.1 μm), and benzo[b]fluoranthene made the largest contribution to total PAHs. The exposure levels of coking-plant workers to PAHs associated with fine particles were higher than to PAHs associated with coarse particles. Benzo[b]fluoranthene, benzo[a]pyrene, and dibenzo[a,h]anthracene should be the primary pollutants monitored in the coking plant. This research constitutes a significant contribution to assessing the exposure risk of coking-plant workers and providing basic data for PAH standards for ambient air in coking plants.
本研究的目的是表征焦化厂环境空气中十种多环芳烃（PAHs）的出现情况和粒径分布。2009年8月，在中国山西的两家焦化厂，使用Staplex234级联冲击器采集了四个粒径级分的颗粒物样本，包括≤2.1、2.1 - 4.2、4.2 - 10.2和≥10.2μm。通过配备质量选择检测器的气相色谱仪分析PAHs。工厂I和工厂II的总颗粒物PAHs浓度分别为1412.7和2241.1 ng/m³，分布显示工厂I在0.1 - 2.1μm粒径范围内有一个峰值，工厂II在0.1 - 4.2μm粒径范围内有一个峰值。在焦化厂I中，除荧蒽外，单个PAHs的粒径分布在0.1 - 2.1μm粒径范围内有一个相当明显的峰值，这可以用气 - 颗粒分配机制来解释。焦化厂的环境空气受到与细颗粒（≤2.1μm）相关的PAHs的严重污染，苯并[b]荧蒽对总PAHs的贡献最大。焦化厂工人接触与细颗粒相关的PAHs的暴露水平高于接触与粗颗粒相关的PAHs的暴露水平。苯并[b]荧蒽、苯并[a]芘和二苯并[a,h]蒽应是焦化厂监测的主要污染物。本研究为评估焦化厂工人的暴露风险以及为焦化厂环境空气中PAH标准提供基础数据做出了重要贡献。
