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Natural aeolian dust particles have no substantial effect on atmospheric polycyclic aromatic hydrocarbons (PAHs): A laboratory study based on naphthalene.
Environmental Pollution ( IF 7.6 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.envpol.2020.114454 Lulu Zhang 1 , Xuan Zhang 1 , Wanli Xing 1 , Quanyu Zhou 1 , Lu Yang 1 , Ryohei Nakatsubo 2 , Yongjie Wei 3 , Jianrong Bi 4 , Masayuki Shima 5 , Akira Toriba 6 , Kazuichi Hayakawa 7 , Ning Tang 8
Environmental Pollution ( IF 7.6 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.envpol.2020.114454 Lulu Zhang 1 , Xuan Zhang 1 , Wanli Xing 1 , Quanyu Zhou 1 , Lu Yang 1 , Ryohei Nakatsubo 2 , Yongjie Wei 3 , Jianrong Bi 4 , Masayuki Shima 5 , Akira Toriba 6 , Kazuichi Hayakawa 7 , Ning Tang 8
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Natural aeolian dust (AD) particles are potential carriers of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere. The heterogeneous interaction between them may lead to worsened air quality and enhanced cytotoxicity and carcinogenicity of ambient particulates in downwind areas, and this topic requires in-depth exploration. In this study, AD samples were collected from four Asian dust sources, and their physical properties and compositions were determined, showing great regional differences. The physical and chemical interactions of different AD particles with naphthalene (Nap; model PAH) were observed in aqueous systems. The results showed that AD particles from the Loess Plateau had weak adsorption to Nap, which was fitted by the Langmuir isotherm. There was no obvious adsorption to Nap found for the other three AD samples. This difference seemed to depend mainly on the specific surface area and/or the total pore volume. In addition, the Nap in the aqueous solution did not undergo chemical reactions under dark conditions and longwave ultraviolet (UV) radiation but degraded under shortwave UV radiation, and 2-formylcinnamaldehyde and 1,4-naphthoquinone were the first-generated products. The degradation of Nap in the aqueous solution was probably initiated by photoionization, and the reaction rate constant (between 1.44 × 10-4 min-1 and 8.55 × 10-4 min-1) was much lower than that of Nap with hydroxyl radicals. Instead of inducing or promoting the chemical change in Nap, the AD particles slowed photodegradation due to the extinction of radiation. Therefore, it is inferred that natural AD particles have no substantial effect on the transportation and transformation of PAHs in the atmosphere.
中文翻译：
天然的风尘颗粒对大气中的多环芳烃（PAHs）没有实质性影响：一项基于萘的实验室研究。
天然的风尘（AD）颗粒是大气中多环芳烃（PAH）的潜在载体。它们之间的异质相互作用可能会导致空气质量恶化，并降低顺风地区周围环境颗粒物的细胞毒性和致癌性，因此需要深入探讨这一主题。在这项研究中，从四个亚洲尘埃源收集了AD样品，并确定了它们的物理性质和组成，显示出很大的区域差异。在水性体系中观察到了不同的AD粒子与萘的物理和化学相互作用（Nap； PAH型）。结果表明，黄土高原地区的AD颗粒对Nap的吸附较弱，这与Langmuir等温线吻合。对于其他三个AD样品，没有发现对Nap的明显吸附。这种差异似乎主要取决于比表面积和/或总孔体积。另外，水溶液中的Nap在黑暗条件下和长波紫外线（UV）辐射下不发生化学反应，而在短波紫外线辐射下降解，并且2-甲酰基肉桂醛和1，4-萘醌是第一生成的产物。Nap在水溶液中的降解可能是由光电离引发的，反应速率常数（介于1.44×10-4 min-1和8.55×10-4 min-1之间）比带有羟基的Nap的降解速率低得多。由于辐射的消灭，AD颗粒没有诱导或促进Nap中的化学变化，而是减缓了光降解。因此，
更新日期：2020-03-31
中文翻译：
天然的风尘颗粒对大气中的多环芳烃（PAHs）没有实质性影响：一项基于萘的实验室研究。
天然的风尘（AD）颗粒是大气中多环芳烃（PAH）的潜在载体。它们之间的异质相互作用可能会导致空气质量恶化，并降低顺风地区周围环境颗粒物的细胞毒性和致癌性，因此需要深入探讨这一主题。在这项研究中，从四个亚洲尘埃源收集了AD样品，并确定了它们的物理性质和组成，显示出很大的区域差异。在水性体系中观察到了不同的AD粒子与萘的物理和化学相互作用（Nap； PAH型）。结果表明，黄土高原地区的AD颗粒对Nap的吸附较弱，这与Langmuir等温线吻合。对于其他三个AD样品，没有发现对Nap的明显吸附。这种差异似乎主要取决于比表面积和/或总孔体积。另外，水溶液中的Nap在黑暗条件下和长波紫外线（UV）辐射下不发生化学反应，而在短波紫外线辐射下降解，并且2-甲酰基肉桂醛和1，4-萘醌是第一生成的产物。Nap在水溶液中的降解可能是由光电离引发的，反应速率常数（介于1.44×10-4 min-1和8.55×10-4 min-1之间）比带有羟基的Nap的降解速率低得多。由于辐射的消灭，AD颗粒没有诱导或促进Nap中的化学变化，而是减缓了光降解。因此，
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