| Summary: | 碩士 === 國立中央大學 === 化學系 === 85 === The purpose of this study is to determinate levels of
organic acid (e.g. formic and acetic acid) in stratoform
clouds observed at the Bamboo Mt. during the northeast monsoon
season.We also determinated the concentration of other ions
and calculated their contribution to cloud acidity.The
concentration of formic acid and acetic acid ranged in
0.42-69.66 meq/l(mean=0.95meq/l)and 0.46-77.93 meq/l(
mean=10.99meq/l),respectively.The acidity of cloudwater
contributed by SO4,NO3 and RCOO, was 71.12%,26.43,and
2.45%,respectivity. The result showed that the contribution of
organic acid was relatively low.High ratio of nssSO4/NO3
indicated that most of acidic substances cloud be contributed
through long-range transport.High regression coefficient
between formic and acetic acid indicated that both acids may
have the same sources. Besides, the pH value of cloudwater cloud
be elevated due to the decomposition of formic and acetic acid.
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