Data/hora: 10/06/2024 15:15:03

Provedor de dados: | 90
País: | Brazil
Título: | Isotope determination of sulfur by mass spectrometry in soil samples
Autores: | Rossete,Alexssandra Luiza Rodrigues Molina; Carneiro,Josiane Meire Toloti; Sant Ana Filho,Carlos Roberto; Bendassolli,José Albertino.
Data: | 2012-12-01
Ano: | 2012
Palavras-chave: | Sample preparation; Soil samples; Isotopic dilution; Labeled material; Stable isotope; 34S.
Resumo: | 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-SO4(2-)), which was determined by dry combustion with alkaline oxidizing agents. The total S-SO4(2-) 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 (K2(34)SO4) was used to validate the method of isotopic determination of S; the results were precise and accurate, showing the viability of the proposed method.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000600012
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832012000600012
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.36 n.6 2012
Fonte: | info:eu-repo/semantics/openAccess