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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053

Abstract

MULLER, Aline L. H et al. Bromine and chlorine determination in cigarette tobacco using microwave-induced combustion and inductively coupled plasma optical emission spectrometry. J. Braz. Chem. Soc. [online]. 2011, vol.22, n.9, pp.1649-1655. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532011000900005.

The microwave-induced combustion (MIC) was applied for cigarette tobacco samples digestion and further determination of bromine and chlorine by inductively coupled plasma optical emission spectrometry (ICP OES). Samples masses up to 500 mg were combusted in closed vessels using 20 bar of oxygen. Combustion was complete in less than 30 s and analytes were absorbed in diluted (NH4)2CO3 solution. Accuracy was evaluated using certified reference materials with similar matrix composition and comparison with results obtained using ICP-MS. The agreement was better than 98% using 50 mmol L-1 (NH4)2CO3 as absorbing solution and 5 min of reflux. Temperature during combustion was higher than 1400 ºC and the residual carbon content in digest obtained after MIC was lower than 1%. Up to eight samples could be processed simultaneously and a single absorbing solution was suitable for both Br and Cl. Limit of quantification by MIC and further ICP OES determination was 12 and 6 µg g-1 for Br and Cl, respectively.

Keywords : microwave-induced combustion; cigarette; bromine; chlorine; ICP OES.

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