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首页> 外文期刊>Air quality, atmosphere & health >Size distribution of atmospheric particulates and particulate-bound polycyclic aromatic hydrocarbons and characteristics of PAHs during haze period in Lampang Province, Northern Thailand
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Size distribution of atmospheric particulates and particulate-bound polycyclic aromatic hydrocarbons and characteristics of PAHs during haze period in Lampang Province, Northern Thailand

机译：泰国北部南邦省雾霾时期大气颗粒物和与颗粒结合的多环芳烃的粒径分布及多环芳烃的特征

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摘要

Size distributions of atmospheric particulates and particulate-bound polycyclic aromatic hydrocarbons (p-PAHs) in different inhalable fractions (9.0–5.8, 5.8–4.7, 4.7–3.3, 3.3–2.1, 2.1–1.1, 1.1–0.7, 0.7–0.4, and <0.4 μm) were investigated during a haze period in Lampang Province, Northern Thailand. The particulate samples were collected using an eight-stage cascade impactor. The sample filter in each stage was weighed to determine concentration followed by ultrasonic extraction with acetonitrile and then analysis using selected ion monitoring–gas chromatograph–mass spectrophotometer to identify 16 PAHs. Similarly, smoke emission from burning rice straw in the rice field and air sample during non-burning period were also analyzed. In this study, the particle size fractions were classified into three different size ranges according to their mechanism of formation: ultrafine particles (nuclei mode, d ae < 0.4 μm), fine particles (accumulation mode, 0.4 μm < d ae < 2.1 μm) and coarse particles (d ae > 2.1 μm). Experimental results show that the average concentration of particulate matter less than 10 μm during the haze period was 3.5 times higher than that during the non-burning period. The atmospheric aerosols during the haze period contained the largest fraction of particles in nuclei mode while the emission during rice straw burning introduced the largest fraction of particles in accumulation mode. The size distributions of total PAHs during the haze period and rice straw burning were shifted towards the smaller particles relative to their particle size distribution. The size distributions of total PAHs were bimodal during the haze period and unimodal during rice straw burning. The fractions of five- and six-ring PAHs bound on the particles were predominantly detected during the haze period whilst those of three- and four-ring PAH compounds were mainly found in smoke emitted from rice straw burning. The ratio of carcinogenic and noncarcinogenic PAH compounds during the haze period was composed of more carcinogenic PAHs than that during rice straw burning.
机译：不同可吸入部分（9.0–5.8、5.8–4.7、4.7–3.3、3.3–2.1、2.1–1.1、1.1–0.7、0.7–0.4，和<0.4μm）在泰国北部南邦省的雾霾时期进行了调查。使用八级串联冲击器收集颗粒样品。称量每个阶段的样品过滤器的重量以确定浓度，然后用乙腈超声提取，然后使用选定的离子监测-气相色谱-质谱仪进行分析，以鉴定出16种PAH。同样，还分析了稻田中稻草燃烧时的烟气排放和非燃烧期的空气样品。在本研究中，根据其形成机理，将粒径分数分为三个不同的尺寸范围：超细颗粒（核模，d ae≤0.4μm），细颗粒（积累模式，0.4μm 2.1μm）。实验结果表明，雾霾期颗粒物的平均浓度小于10μm，比非燃烧期高3.5倍。雾霾时期的大气气溶胶以核模式包含最大部分的颗粒，而稻草燃烧期间的排放以累积模式包含最大部分的颗粒。在雾霾和稻草燃烧期间，总PAHs的粒径分布相对于其粒径分布向较小的颗粒移动。在雾霾时期，总PAHs的尺寸分布是双峰的，在稻草燃烧期间是单峰的。在雾霾时期主要检测到结合在颗粒上的五环和六环PAH的分数，而三环和四环PAH化合物的分数主要发现于稻草燃烧产生的烟雾中。烟霾时期致癌和非致癌PAH化合物的比例比稻草燃烧过程中的致癌PAH组成更多。

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