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Air-Water Partitioning of Biomass-Burning Phenols and the Effects of Temperature and Salinity.
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2020-03-24 , DOI: 10.1021/acs.est.9b06443
Alexander S McFall 1 , Alex W Johnson 1 , Cort Anastasio 1
Affiliation  

Biomass burning (BB) emits organic gases that, with chemical aging, can form secondary organic aerosol (SOA) in both the gas and aqueous phases. One class of biomass-burning emissions, phenols, are of interest because they react rapidly in the aqueous phase to efficiently form SOA, which might affect climate and human health. However, while measurements exist for the air–water partitioning constants of some simple phenols, Henry’s law constants (KH) are unknown for more complex BB phenols. In this work, we use a custom-built apparatus to measure KH for a suite of biomass-burning phenols that span a wide range of air–water partitioning coefficients. Comparing our measurements to predicted values from EPI Suite shows that this model consistently overestimates KH unless a suitable measured phenol KH value is included to adjust the calculations. In addition, we determine the effect of five salts on phenol partitioning by measuring the Setschenow coefficients (KS). Across the eight phenols we examined, values of KS depend primarily on salt identity and descend in the order (NH4)2SO4 > NaCl > NH4Cl ≥ KNO3 > NH4NO3. Lastly, we use our KH and KS results to discuss the aqueous processing of biomass-burning phenols in cloud/fog water versus aerosol liquid water.

中文翻译:

生物量燃烧酚的空气-水分配以及温度和盐度的影响。

生物质燃烧(BB)释放出有机气体,随着化学老化,它们可以在气相和水相中形成二次有机气溶胶(SOA)。一类生物质燃烧排放物苯酚是令人关注的,因为它们在水相中迅速反应以有效形成SOA,这可能会影响气候和人类健康。但是,尽管存在一些简单酚的空气-水分配常数的测量方法,但对于更复杂的BB酚,亨利定律常数(K H)是未知的。在这项工作中,我们使用定制的仪器来测量一套K- H,这些K- H涵盖了范围广泛的空气-水分配系数的一组生物质燃烧酚。将我们的测量结果与EPI Suite的预测值进行比较表明,该模型始终高估了ķ ħ除非合适的测量苯酚ķ ħ值被包括来调整计算。此外,我们通过测量Setschenow系数(K S)来确定五种盐对苯酚分配的影响。在我们检查的八种酚中,K S值主要取决于盐的同一性,并以(NH 42 SO 4 > NaCl> NH 4 Cl≥KNO 3 > NH 4 NO 3的顺序降序。最后,我们使用K HK S 结果讨论了云/雾水与气雾剂液态水对生物质燃烧酚的水处理。
更新日期:2020-03-24
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