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The loss of Cl as HC1 from sea salt particles by air pollutants (NO<SUB>3</SUB><SUP>-</SUP> and SO<SUB>4</SUB><SUP>2-</SUP>) in the marine atmosphere was discussed, based on both laboratory experiments and field measurements.<BR>In the laboratory experiments, the release of gaseous HCl from sea salt particles was simulated by passing NO<SUB>2</SUB> or SO<SUB>2</SUB> through a filter impregnated with sea water. The release of HCl from the filter occurred by the aeration with NO<SUB>2</SUB> or SO<SUB>2</SUB>, and the concentration of HClreleased depended on both the concentration of NO<SUB>2</SUB> or SO<SUB>2</SUB> and relative humidity. The generation rates of HC1 calcurated from the added amounts of NO<SUB>2</SUB> and SO<SUB>2</SUB> were 9% for NO<SUB>2</SUB>and 18% for SO<SUB>2</SUB> (Table 1 and 2).<BR>The marine aerosol was collecte d by Andersen samplers during January 13-20 and December 14-20, 1981 in the two remote islands, Hachijo-jima and Chichi-jima in order to in vestigate the Cl loss from sea salt in the marine atmosphere. The calcurated Cl losses from sea salt particles ( <2 μm) based on the Cl/Na ratio in sea water (1.8) were 0.21 to 0.36 pg/m<SUP>3</SUP>, and 2 to 7% of total particulate marine Cl at the two islands. The Cl loss from sea salt particles smaller than 1 gm was more than 20%, while that from particles larger than 2iam was negligible (Fig.4). A linear correlation was observed between measured SO<SUB>4</SUB><SUP>2-</SUP> concentrations (<2 μm) and Cl losses, indicating a 1.1 iimol/m<SUP>3</SUP> Cl loss per 1 iumol/m<SUP>3</SUP> SO<SUB>4</SUB><SUP>2-</SUP> (Fig.5). The HCl concentrations estimated from the Cl losses (5.9×10<SUP>-3</SUP> to 10× 10<SUP>-3</SUP>, μmol/m <SUP>3</SUP> ) agreed with the measured HCl concentrations in the marine atomosphere (4.8 × 10<SUP>-3</SUP> to 15 × 10<SUP>3</SUP>, μmolf m<SUP>3</SUP>) (Table 5), suggesting that the release salt particles is the main source of gaseous HCl in the marine atomosphere.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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