Wet deposition chemistry studies at Suva, Fiji, a remote tropical island site in the south Pacific |
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Authors: | K. Koshy G. Ayers R. Gillett P. Selleck |
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Affiliation: | (1) School of Pure and Applied Sciences, The University of the South Pacific, PO Box 1168, Suva, Fiji;(2) Division of Atmospheric Research, CSIRO, Private Bag No.1, Mordialloc, 3195, Australia |
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Abstract: | A field project encompassing wet-only rainwater sampling was initiated as a bilateral Fiji/Australia activity. Normally, biweekly samples were collected, using a wet-only rainwater sampler, and analysed for H+, Na+, K+, Mg2+, NH4+, Cl–, NO3–, SO42–, PO43-, methane sulphonic acid, oxalic acid, formic acid and acetic acid. The pH of the rainwater ranged between 5.730 and 4.480 with an average value of 5.176, slightly lower than the pH of unpolluted rainwater saturated with atmospheric CO2(pH = 5.650). Na+and Cl–were the major ions with average concentrations of 98.15 M and 109.57 M respectively. There is an excellent correlation between the cation sum (average 147.71 eq L-1) and the anion sum (average 142.12 eq L-1) attesting to the quality of the data generated. This paper presents the detailed results of the study for a relatively clean remote island site in Suva, Fiji, latitude 18° 09 S, longitude 178° 27 E, height 6 m, and outlines prospects for further work. |
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Keywords: | wet deposition rainwater chemistry acidic precipitation rainwater ion balance |
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