Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.talanta.2008.07.053
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dc.titleDetermination of total nitrogen in atmospheric wet and dry deposition samples
dc.contributor.authorKarthikeyan, S.
dc.contributor.authorHe, J.
dc.contributor.authorPalani, S.
dc.contributor.authorBalasubramanian, R.
dc.contributor.authorBurger, D.
dc.date.accessioned2014-10-07T06:26:35Z
dc.date.available2014-10-07T06:26:35Z
dc.date.issued2009-01-15
dc.identifier.citationKarthikeyan, S., He, J., Palani, S., Balasubramanian, R., Burger, D. (2009-01-15). Determination of total nitrogen in atmospheric wet and dry deposition samples. Talanta 77 (3) : 979-984. ScholarBank@NUS Repository. https://doi.org/10.1016/j.talanta.2008.07.053
dc.identifier.issn00399140
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/84560
dc.description.abstractA microwave-assisted persulfate oxidation method followed by ion chromatographic determination of nitrate was developed for total nitrogen determination in atmospheric wet and dry deposition samples. Various operating parameters such as oxidation reagent concentrations, microwave power, and extraction time were optimized to maximize the conversion of total nitrogen to nitrate for subsequent chemical analysis. Under optimized conditions, 0.012 M K2S2O8 and 0.024 M NaOH were found to be necessary for complete digestion of wet and dry deposition samples at 400 W for 7 min using microwave. The optimized extraction method was then validated by testing different forms of organic nitrogen loaded to pre-baked filter substrates and NIST SRM 1648 (urban particulate matter), and satisfactory results were obtained. In the case of wet deposition samples, standard addition experiments were performed. The suitability of the method for real-world application was assessed by analyzing a number of wet and dry deposition samples collected in Singapore during the period of March-April 2007. The organic nitrogen content was 15% (wet) and 30% (dry) of the total nitrogen. During the study period, the estimated wet fluxes for nitrate (NO3 -), ammonium (NH4 +), organic nitrogen (ON), and total nitrogen (TN) were 16.1 ± 6.5 kg ha-1 year-1, 11.5 ± 5.7 kg ha-1 year-1, 3.8 ± 1.5 kg ha-1 year-1and 31.5 ± 13.2 kg ha-1 year-1, respectively, while the dry fluxes were 2.5 ± 0.8 kg ha-1 year-1, 1.4 ± 0.9 kg ha-1 year-1, 2.3 ± 1.4 kg ha-1 year-1 and 7.5 ± 2.6 kg ha-1 year-1, respectively. © 2008 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.talanta.2008.07.053
dc.sourceScopus
dc.subjectAtmospheric deposition
dc.subjectIon chromatography
dc.subjectMicrowave
dc.subjectTotal nitrogen
dc.typeArticle
dc.contributor.departmentDIVISION OF ENVIRONMENTAL SCIENCE & ENGG
dc.contributor.departmentCIVIL ENGINEERING
dc.contributor.departmentTROPICAL MARINE SCIENCE INSTITUTE
dc.description.doi10.1016/j.talanta.2008.07.053
dc.description.sourcetitleTalanta
dc.description.volume77
dc.description.issue3
dc.description.page979-984
dc.description.codenTLNTA
dc.identifier.isiut000262761300007
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