1 Keene W C, Galloway J N. The biogeochemical cycling of formic and acetic acids through the troposphere: An overview of currentunderstanding. Tell, 1988, 40: 322-334
[2]
2 Pena R M, García S, Herrero C, et al. Organic acids and aldehydes in rainwater in a northwest region of Spain. Atmos Environ, 2002, 36:5277-5288？？
[3]
8 Galloway J N, Keene W C, Likens G E, et al. The composition of precipitation in remote areas of the world. J Geophys Res, 1982, 87:8771-8786？？
[4]
11 Sabbioni C, Ghedini N, Bonazza A. Organic anions in damage layers on monuments and buildings. Atmos Environ, 2003, 37: 1261-1269？？
[5]
13 Keene W C, Galloway J N. Considerations regarding sources for formic and acetic acids in the troposphere. J Geophys Res, 1986, 91:14466-14474？？
[6]
14 Kawamura K, Kasukabe H, Barrie L A. Source and reaction pathways of dicarboxylic acids, ketoacids and dicarbonyls in arctic aerosols:One year of observations. Atmos Environ, 1996, 30: 1709-1722？？
[7]
3 Tanner P A, Law P T. Organic acids in the atmosphere and bulk deposition of Hong Kong. Water Air Soil Pollut, 2003, 142: 279-297？？
[8]
4 Wang H, Shoote D. Low molecular weight dicarboxylic acids in PM10 in a city with intensive solid fuel burning. Chemosphere, 2004, 56:725-733？？
9 Yu S, Gao C, Cheng Z. et al. An analysis of chemical composition of different rain types in Minnan Golden Triangle’ region in thesoutheastern coast of China. Atmos Res, 1998, 47: 245-269？？
12 Kumar N, Kulshrestha U C, Khare P, et al. Measurements of formic and acetic acid levels in the vapour phase at Dayalbagh, Agra, India.Atmos Environ, 1996, 30: 3545-3550？？
18 Fornaro A, Ivano G R. Wet deposition and related atmospheric chemistry in the Sao Paulo Metropolis, Brazil: Part 2-contribution offormic and acetic acids. Atmos Environ, 2003, 37: 117-128
20 Avery G B, Willey J D, Kieber R J. Diurnal variations in major rainwater components at a coastal site in North Carolina: North America.Atmos Environ, 2001, 35: 3927-3933？？
[21]
21 Sakugawa H, Kaplan I R, Shepard L S. Measurements of H2O2, Aldehydes and organic acids in Los Angeles rainwater: Their sources anddeposition rates. Atmos Environ B: Urban Atmosphere, 1993, 27: 203-219
[22]
22 Zhang Y L, Lee X Q, Cao F, et al. Chemical characteristics and sources of organic acids in precipitation at a semi-urban site in SouthwestChina. Atmos Environ, 2011, 45: 413-419？？
[23]
23 Kumar N, KulShrestha U C, Saxena A, et al. Formate and acetate levels compared in monsoon and winter rainwater at Dayalbagh, Agra(India). J Atmos Chem, 1996, 23: 81-87？？
[24]
24 Souza S R, Vasconcellos P C, Carvalho L R. Low molecular weight carboxylic acids in an urban atmosphere: Winter measurements in SaoPaulo City, Brazil. Atmos Environ, 1999, 33: 2563-2574？？
[25]
25 Talbot R W, Beecher K M, Harriss R C, et al. Atmospheric geochemistry of formic and acetic acids at a mid-latitude temperate site. JGeophys Res, 1988, 93: 1638-1652？？
[26]
26 Millet M, Wortham H, Sanusi A, et al. Low molecular weight organic acids in fogwater in an urban area: Strasbourg (France). Sci TotalEnviron, 1997, 206: 57-65？？
