Water Solubility Distribution of Organic Matter Accounts for the Discrepancy in Hygroscopicity among Sub- and Supersaturated Humidity Regimes

Wen-Chien Lee; Yange Deng; Ruichen Zhou

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Water Solubility Distribution of Organic Matter Accounts for the Discrepancy in Hygroscopicity among Sub- and Supersaturated Humidity Regimes

机译：Water Solubility Distribution of Organic Matter Accounts for the Discrepancy in Hygroscopicity among Sub- and Supersaturated Humidity Regimes

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Water uptake properties of organic matter (OM) are critical for aerosol direct and indirect effects. OM contains various chemical species that have a wide range of water solubility. However, the role of water solubility on water uptake by OM has poorly been investigated. We experimentally retrieved water solubility distributions of water-soluble OM (WSOM) from combustion of mosquito coil and tropical peat using the 1- octanol-water partitioning method. In addition, hygroscopic growth and cloud condensation nuclei (CCN) activity of solubility-segregated WSOM were measured. The dominant fraction of WSOM from mosquito coil smoldering was highly soluble (water solubility (S) > 10~(-2) g cm~(-3)), while that from peat combustion contained ～40 of less-soluble species (S < 10~(-3) g cm~(-3)). The difference in water solubility distributions induced changes in the roles of less water-soluble fractions (S < 10~(-3) g cm~(-3)) on CCN activity. Namely, the less water-soluble fraction from mosquito coil combustion fully dissolved at the point of critical supersaturation, while that for tropical peat smoldering was limited by water solubility. The present result suggests that water solubility distributions of OM, rather than its bulk chemical property, need to be quantified for understanding the water uptake process.

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《Environmental Science & Technology: ES&T》 |2022年第24期|17924-17935|共12页
作者
Wen-Chien Lee; Yange Deng; Ruichen Zhou;
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作者单位

Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China;

Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan;

Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
water solubility; polarity; organic matter; hygroscopicity; cloud condensation nuclei; 1-octanol-water partition coefficient; oxygen-to-carbon elemental ratio;

Water Solubility Distribution of Organic Matter Accounts for the Discrepancy in Hygroscopicity among Sub- and Supersaturated Humidity Regimes

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