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Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

ROSSETE, Alexssandra Luiza Rodrigues Molina; CARNEIRO, Josiane Meire Toloti; SANT ANA FILHO, Carlos Roberto  e  BENDASSOLLI, José Albertino. Isotope determination of sulfur by mass spectrometry in soil samples. Rev. Bras. Ciênc. Solo [online]. 2012, vol.36, n.6, pp.1787-1793. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832012000600012.

Sulphur plays an essential role in plants and is one of the main nutrients in several metabolic processes. It has four stable isotopes (32S, 33S, 34S, and 36S) with a natural abundance of 95.00, 0.76, 4.22, and 0.014 in atom %, respectively. A method for isotopic determination of S by isotope-ratio mass spectrometry (IRMS) in soil samples is proposed. The procedure involves the oxidation of organic S to sulphate (S-SO42-), which was determined by dry combustion with alkaline oxidizing agents. The total S-SO42- concentration was determined by turbidimetry and the results showed that the conversion process was adequate. To produce gaseous SO2 gas, BaSO4 was thermally decomposed in a vacuum system at 900 ºC in the presence of NaPO3. The isotope determination of S (atom % 34S atoms) was carried out by isotope ratio mass spectrometry (IRMS). In this work, the labeled material (K234SO4) was used to validate the method of isotopic determination of S; the results were precise and accurate, showing the viability of the proposed method.

Palavras-chave : sample preparation; soil samples; isotopic dilution; labeled material; stable isotope; 34S.

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