Production of 34S-labeled gypsum (Ca34SO4.2H2O)

Scientia Agricola

Alexssandra Luiza Rodrigues Molina Rossete²  José Albertino Bendassolli²  Everaldo Máximo²  Carlos Roberto Sant Ana Filho²  Raquel De Fátima De Ignoto¹ 

[1] ,USP CENA Lab. de Isótopos EstáveisPiracicaba SP ,Brasil

关键词: sulfur 34;    stable isotope;    isotopic determination;    enxofre 34;    isótopo estável;    determinação isotópica;   

DOI  :  10.1590/S0103-90162006000400012

来源: SciELO

【 摘 要 】

Agricultural gypsum (CaSO4.2H2O) stands out as an effective source of calcium and sulfur, and to control aluminum saturation in the soil. Labeled as 34S it can elucidate important aspects of the sulfur cycle. Ca34SO4.2H2O was obtained by chemical reaction between Ca(OH)2 and H2(34)SO4, performed under slow agitation. The acid was produced by ion exchange chromatography using the Dowex 50WX8 cation exchange resin and a Na2(34)SO4 eluting solution. After precipitation, the precipitate was separated and dried in a ventilated oven at 60ºC. From 2.2 L H2SO4 0.2 mol L-1 and 33.6 g Ca(OH)2, 73.7 ± 0.6 g Ca34SO4.2H2O were produced on average in the tests, representing a mean yield of 94.6 ± 0.8%, with 98% purity. The 34SO2 gas was obtained from Ca34SO4.2H2O in the presence of NaPO3 in a high vacuum line and was used for the isotopic determination of S in an ATLAS-MAT model CH-4 mass spectrometer.

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