Humic-like substances global levels and extraction methods in aerosols
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The abundance of humic-like substances in the atmosphere has received considerable attention since these substances play an important role in various atmospheric processes. The wide variety of quantitative techniques used to study humic-like substances produce dissimilar results, making data comparison difficult. Also, global background concentrations and the transfer of atmospheric humic-like substances are poorly known. Here, we compared resins to extract humic-like substances in aerosols, and we measured contents in aerosols from Mt. Fuji. Results show that diethylaminoethyl cellulose resins extracted more humic-like substances than the diethylaminoethyl resin (hydroxylated methacrylic polymer). The mean humic-like substances concentrations in the free troposphere in East Asia is similar to that in Europe, suggesting that the global background level of humic-like substances is 0.05 μg C m−3, based on the humic-like substances concentrations on Mt. Fuji and Mt. Sonnblick. Humic-like substances concentrations, especially fulvic acids concentration, at the summit of Mt. Fuji increased when air masses came from the continent along with the carbon monoxide and ozone.
KeywordsDiethylaminoethyl resin Free troposphere Humic-like substances Water-soluble organic carbon
This research was carried out by cooperation from the NPO Mount Fuji Research Station (MFRS) and supported by Grant-in-Aid for Scientific Research (No. 16K21427) from the Japan Society for the Promotion of Science and Waseda University Grant for Special Research Projects (Project Number: 2016S-068).
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