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• W2040479959 abstract "Abstract. HUmic-LIke Substances (HULIS) are an abundant unresolved mixture of organic compounds present in atmospheric samples. Biomass burning (BB) has been recognized as an important primary source of HULIS, but measurements of HULIS in various fresh BB particles are lacking. In this work, HULIS in emissions of rice straw burning in a number of field and chamber experiments was measured. The HULIS/OC ratio was 0.34±0.05 in μg/μgC, showing small variance among emissions under different burning conditions. The influence of BB on ambient HULIS levels was investigated by examining the spatial and temporal variation of HULIS and other aerosol constituents and interspecies relations in ambient PM2.5 collected at an urban and a suburban location in the Pearl River Delta (PRD), China over a period of one year. The HULIS concentrations in the ambient PM2.5 were significantly higher in air masses originating from regions influenced by BB. Significant correlations between HULIS and water-soluble K+ concentrations at both sites further support that BB was an important source of HULIS. HULIS also correlated well with sulfate, oxalate, and oxidant (the sum of O3 and NO2). The HULIS/OC ratios in BB-influenced ambient aerosols (~0.6) were much higher than those in the fresh BB emissions (0.34), implying that secondary formation was also an important source of HULIS in the atmosphere. The annual average HULIS concentrations were 4.9 μg m−3 at the urban site and 7.1 μg m−3 at the suburban site while the annual average concentrations of elemental carbon were 3.3 μg m−3 and 2.4 μg m−3, respectively. The urban-suburban spatial gradient of HULIS was opposite to that of elemental carbon, negating vehicular emissions as a significant source of HULIS." @default.
• W2040479959 created "2016-06-24" @default.
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• W2040479959 date "2010-03-17" @default.
• W2040479959 modified "2023-10-02" @default.
• W2040479959 title "HULIS in emissions of fresh rice straw burning and in ambient aerosols in the pearl river delta region, China" @default.
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• W2040479959 doi "https://doi.org/10.5194/acpd-10-7185-2010" @default.
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