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Josiane Meire Toloti Carneiro ; Carlos Roberto Sant Ana Filho ; José Albertino Bendassolli ;Revista Brasileira de Ciência do Solo 2012, 36 6

Autor: Alexssandra Luiza Rodrigues Molina Rossete

Fuente: http://www.redalyc.org/


Introducción



Revista Brasileira de Ciência do Solo ISSN: 0100-0683 revista@sbcs.org.br Sociedade Brasileira de Ciência do Solo Brasil Rodrigues Molina Rossete, Alexssandra Luiza; Toloti Carneiro, Josiane Meire; Sant Ana Filho, Carlos Roberto; Bendassolli, José Albertino ISOTOPE DETERMINATION OF SULFUR BY MASS SPECTROMETRY IN SOIL SAMPLES Revista Brasileira de Ciência do Solo, vol.
36, núm.
6, 2012, pp.
1787-1793 Sociedade Brasileira de Ciência do Solo Viçosa, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=180225136021 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative ISOTOPE DETERMINATION OF SULFUR BY MASS SPECTROMETRY IN SOIL SAMPLES 1787 ISOTOPE DETERMINATION OF SULFUR BY MASS SPECTROMETRY IN SOIL SAMPLES(1) Alexssandra Luiza Rodrigues Molina Rossete(2), Josiane Meire Toloti Carneiro(2), Carlos Roberto Sant Ana Filho(2) & José Albertino Bendassolli(3) SUMMARY 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 ...





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