Chemical Characteristics of Cloud Water and Sulfate Production Under Excess Hydrogen Peroxide in a High Mountainous Region of Central Japan
| Autor: | Masako Kagawa, Yutaka Ishizaka, Nagayoshi Katsuta |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Environmental Engineering Aqueous solution Ecological Modeling Hydrochloric acid 010501 environmental sciences complex mixtures 01 natural sciences Pollution Peroxide respiratory tract diseases chemistry.chemical_compound chemistry Environmental chemistry Environmental Chemistry sense organs Sulfate Hydrogen peroxide Dissolution Sulfur dioxide 0105 earth and related environmental sciences Water Science and Technology Organic acid |
| Zdroj: | Water, Air, & Soil Pollution. 232 |
| ISSN: | 1573-2932 0049-6979 |
| DOI: | 10.1007/s11270-021-05099-y |
| Popis: | Over the last two decades, atmospheric sulfur dioxide (SO2) concentrations have decreased in air-polluted regions. However, this decrease was accompanied by a rise in cloud water acidity (pH), which remains below 5. With this change, gas-phase hydrogen peroxide (H2O2) exceeded SO2 in most of these regions. These conditions where SO2 10) in our observation site, which was due to power plant restrictions in Japan since the 1970s. The ion species concentrations in cloud water indicated that cloud acidification resulted from dissolution of gaseous HNO3 and SO2, whereas gaseous hydrochloric acid and organic acid had a minor contribution to the acidification. Significant losses of Cl− and Mg2+ were observed in some of the cloud water. The excess value of non-sea-salt sulfate (nss-SO42−) over NH4+ in cloud water implies the in-cloud oxidation of gaseous SO2 to aqueous SO42−. A Se tracer technique was used to conduct in-situ measurements of in-cloud SO42− production. The results showed that the in-cloud production varied in a range between 7 ± 2 and 41 ± 14%. This temporal variation might be due to ambient SO2 concentrations based on Henry’s law. |
| Databáze: | OpenAIRE |
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