Light absorption and scattering properties of indole secondary organic aerosol prepared under various oxidant and relative humidity conditions
Light absorption and scattering properties of indole secondary organic aerosol prepared under various oxidant and relative humidity conditions
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不同氧化剂和相对湿度条件下制备的吲哚二次有机气溶胶的光吸收和散射特性
DOI：
10.1080/02786826.2023.2193235
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发表时间：
2023
影响因子：
5.2
通讯作者：
Nizkorodov, Sergey A.
中科院分区：
文献类型：
--
作者：
Baboomian, Vahe J.;He, Quanfu;Montoya-Aguilera, Julia;Ali, Nabila;Fleming, Lauren T.;Lin, Peng;Laskin, Alexander;Laskin, Julia;Rudich, Yinon;Nizkorodov, Sergey A.
在不同相对湿度(RH=-lt；2%、25%和50%)和不同的氧化剂(O_3、OH、OH、 + 、NO_x和NO_3)下，在烟雾室中生成吲哚二次有机气溶胶。在2 0 0~70 0 nm范围内，用甲醇萃取超氧化物歧化产物，测定其质量吸收系数。采用高效液相色谱-分光光度-质谱法对发色化合物进行了初步鉴定。最强的生色团之一是硝基吲哚，它由NO3和OH + NOx氧化产生。在不同的RH条件下，使用相同的氧化剂，在氧化流动反应器(OFR)中也制备了吲哚SOA。氧化还原生成的超氧化物歧化产物的密度从1.05 g/cm~3(吲哚 + O_3SO)到1.33 g/cm~3(吲哚 + OH)。用宽带腔增强光谱仪(BBCES)在360-425 nm光谱范围内对实(N)和虚(K)折射率进行了量化。在405−nm处的k值为10−2~10 1，与腐植酸类物质的k值相当，比其他生物和人为挥发性有机化合物产生的SOA值大至少一个数量级。吲哚 + NO3SOAK值对RH有很强的非单调依赖性，表明生色团有两种相互竞争的反应机制，突出了水对SOA杂环芳香前体吸收系数的复杂影响。吲哚SOA的强烈吸收可能会导致其排放源附近能见度的下降，这些排放源包括畜牧业设施和受压力的植物。版权所有©2023美国气溶胶研究协会
Secondary organic aerosol (SOA) from indole was produced in a smog chamber under different relative humidity (RH = <2%, 25% and 50%) and with different oxidants (O3, OH, OH + NOx, and NO3). The mass absorption coefficients were measured by extracting SOA in methanol and taking absorption spectra in the 200-700 nm range. Chromophoric compounds were tentatively identified by liquid chromatography – spectrophotometry – mass spectrometry. One of the strongest chromophores was nitroindole, produced in high abundance by both NO3and OH + NOxoxidation. Indole SOA was also prepared in an oxidation flow reactor (OFR) using the same set of oxidants under variable RH conditions. Densities of the OFR-generated SOA particles ranged from 1.05 g/cm3for indole + O3SOA to 1.33 g/cm3for indole + OH SOA. The real (n) and imaginary (k) refractive indices were quantified using a broadband cavity-enhanced spectrometer (BBCES) over the 360–425 nm spectral range. The values ofkranged from 10−2to 10−1at 405 nm, which is comparable to those for humic-like substances and at least an order of magnitude larger thankvalues of SOA produced from other biogenic and anthropogenic volatile organic compounds. Thekvalues for the indole + NO3SOA had a strong and non-monotonic dependence on RH, suggesting two competing reaction mechanisms for the chromophores, highlighting the complex effect of water on the absorption coefficient of SOA from heterocyclic aromatic precursors. Strong absorption of indole SOA may contribute to the degradation of visibility near its emission sources, which include animal husbandry facilities and stressed plants.Copyright © 2023 American Association for Aerosol Research
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DOI：
10.1021/acsearthspacechem.0c00353
发表时间：
2021-04
期刊：
--
影响因子：
--
作者：
Yumeng Cui;A. Frie;J. Dingle;Stephen Zimmerman;I. Frausto-Vicencio;F. Hopkins;R. Bahreini
通讯作者：
Yumeng Cui;A. Frie;J. Dingle;Stephen Zimmerman;I. Frausto-Vicencio;F. Hopkins;R. Bahreini
影响因子：
1.5
作者：
N. Osaka;A. Miyazaki;N. Tanaka
通讯作者：
N. Tanaka
影响因子：
11.4
作者：
Li C;He Q;Fang Z;Brown SS;Laskin A;Cohen SR;Rudich Y
通讯作者：
Rudich Y
影响因子：
6.3
作者：
Gentner, D. R.;Ormeno, E.;Goldstein, A. H.
通讯作者：
Goldstein, A. H.
影响因子：
15
作者：
J. Weinstein;G. Wyman
通讯作者：
G. Wyman