oa South African Journal of Chemistry - Determination of carboxylic acids and water-soluble inorganic ions by ion chromatography in atmospheric aerosols from Tanzania : research article
|Article Title||Determination of carboxylic acids and water-soluble inorganic ions by ion chromatography in atmospheric aerosols from Tanzania : research article|
|© Publisher:||South African Chemical Institute (SACI)|
|Journal||South African Journal of Chemistry|
|Affiliations||1 Sokoine University of Agriculture, Tanzania, 2 Universidade Federal da Bahia (UFBA), Brazil and 3 Universidade Federal da Bahia (UFBA), Brazil|
|Publication Date||Jan 2014|
|Pages||118 - 123|
|Keyword(s)||Aerosol particles, Organic acids, PM10, PM2.5, Sources and Tanzania|
Atmospheric aerosol samples of PM2.5 and PM10 were collected in April-May 2011 from a rural site in Tanzania and analyzed for water-soluble inorganic ions and low molecular weight carboxylic acids using ion chromatography. PM2.5 and PM10 low-volume samplers with quartz fibre filters were deployed and aerosol collections on a 24 h basis were made for each sampler. All samples were analyzed for carboxylates and inorganic ions by using ion chromatography. The results showed that mean mass concentration of PM2.5 and PM10 were 13 ± 3.5 µg m-3 and 16 ± 2.3 µg m-3, respectively. Mean concentrations of the total carboxylates were 23.7 ± 6.5 ngm-3 in PM2.5 and 36.4 ± 12 ngm-3 in PM10 whereas total water-soluble inorganic ions were 448 ± 88 ngm-3 and 646 ± 214 ngm-3, respectively. Oxalate and malonate in PM2.5 and acetate in PM10 were most abundant carboxylates accounting for 64% and 62% of total acids, respectively. Mg2+ was most important cation in PM2.5 and PM10 accounting for 44 % and 24 % of total water-soluble ions, respectively, whereas SO42- was the main anionic component accounting for 23% of total ions species in PM2.5 and 37 % in PM10. Using source indicators, we found photochemical activities, biogenic and biomass burning could possibly be important source types for aerosols in Tanzania.
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