Department of Land, Air, and Water Resources, University of California, Davis, Davis, California 95670, United States.
Environ Sci Technol. 2020 Apr 7;54(7):3823-3830. doi: 10.1021/acs.est.9b06443. Epub 2020 Mar 24.
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 () are unknown for more complex BB phenols. In this work, we use a custom-built apparatus to measure 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 unless a suitable measured phenol value is included to adjust the calculations. In addition, we determine the effect of five salts on phenol partitioning by measuring the Setschenow coefficients (). Across the eight phenols we examined, values of depend primarily on salt identity and descend in the order (NH)SO > NaCl > NHCl ≥ KNO > NHNO. Lastly, we use our and results to discuss the aqueous processing of biomass-burning phenols in cloud/fog water versus aerosol liquid water.
生物质燃烧（BB）排放的有机气体，随着化学老化，可以在气相和水相中形成二次有机气溶胶（SOA）。生物质燃烧排放的一类物质，酚类，因其在水相中快速反应，有效地形成 SOA 而受到关注，这可能会影响气候和人类健康。然而，虽然一些简单酚类物质的气-水分配常数（）已有测量值，但更复杂的 BB 酚类物质的亨利定律常数（）却未知。在这项工作中，我们使用定制的设备来测量一系列具有广泛气-水分配系数的生物质燃烧酚类物质的。将我们的测量值与 EPI Suite 预测值进行比较表明，除非包括合适的实测酚值来调整计算，否则该模型会一直高估。此外，我们通过测量塞滕豪尔系数（）来确定五种盐对酚类分配的影响。在所研究的 8 种酚类物质中，值主要取决于盐的种类，按（NH）SO > NaCl > NHCl≥KNO > NHNO 的顺序下降。最后，我们利用我们的和结果来讨论云/雾水中与气溶胶液水中生物质燃烧酚类物质的水相处理。
