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Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils 90
Batista,Araína Hulmann; Melo,Vander Freitas; Gilkes,Robert.
ABSTRACT: Extraction of K and Mg with boiling 1 mol L-1 HNO3 in an open system for predicting K and Mg uptake by plants is a method of low reproducibility. The aim of this study was to compare the extraction capacity of different acid methods relative to hydrofluoric acid extraction for K and Mg. A further objective was to develop a chemical extraction method using a closed system (microwave) for nonexchangeable and structural forms of these nutrients in order to replace the traditional method of extraction with boiling HNO3 on a hot plate (open system). The EPA 3051A method can be used to estimate the total content of K in the clay fraction of soils developed from carbonate and phyllite/mica schist rocks. In the clay fraction of soils developed from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: EPA 3051A; EPA 3052; Aqua regia; Boiling nitric acid; Microwave extraction; Nonexchangeable K.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100431
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