Gaseous formic and acetic acids in the atmosphere of Yokohama,Japan |
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| Authors: | J J Schultz Tokos S Tanaka T Morikami H Shigetani Y Hashimoto |
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| Institution: | (1) Department of Applied Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, 223 Yokohama, Japan;(2) Present address: Institut für Meereskunde, 2300 Kiel, F. R. Germany |
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| Abstract: | Gaseous formic acid (HCOOHg) and acetic acid (CH3COOHg) were measured every 30 minutes during a 10 hour daylight period in August, and a 24 hour period in October, 1990 in the urban atmosphere of Yokohama, Japan. An aqueous nebulizer sampler and ion-chromatography exclusion (ICE) were used for the measurements. In the August experiment (0800–1800 local time) the mean HCOOHg concentration was found to be 7.3±2.5 ppbv. The mean CH3COOHg concentration was 3.8±1.2 ppbv. In the 24 hour experiment in October, concentrations of both acids were lower between 0800–1800 than during the same time-period in August (mean HCOOHg=4.4±2.7 ppbv, mean CH3COOHg=1.4±0.5 ppbv). In October, concentrations of both acids were higher in daylight hours than at night; sporadic high HCOOHg concentrations were observed. In both experiments the ratio HCOOHg/CH3COOHg of individual samples was usually  2.0 (mean ratio of 2.0 in August, 3.1 in October). |
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| Keywords: | formic acid acetic acid urban atmosphere nebulizer sampler |
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