6Khare P, Satsangi G S, Kumar N, et al. HCHO, HCOOH and CH3 COOH in air and rain water at a rural tropical site in North Central India[ J ]. Atmos Environ, 1997, 31 (23) : 3867-3875.
7Loflund M, Kasper G A, Schuster B, et al. Formic, acetic, oxalic,malic and succinic acid concentrations and their contribution to organic carbon in cloud water[J]. Atmos Environ, 2002, 36 (9): 1553-1558.
8Jacob D J. The chemistry of OH in remote clouds and its role in the production of formic acid and peroxymonosulfate[J]. J Geophys Res, 1994, 99 (D1): 1241-1253.
9Keeling R F. Measuring correlations between atmospheric oxygen and carbon dioxide mole fractions: A preliminary study in urban air[J]. J Atmos Chem, 1988, 7 (2) : 153-176.
10Chebbi A, Carlier P. Carboxylic acids in the troposphere, occurrence, sources, and sinks: A Enview [ J ]. Atmos Environ, 1996, 30 (24): 4233-4249.
