Determinação colorimétrica de cobre e zinco, na análise foliar
Colorimetric determination of coffer and zinc for leaf analysis studies
J. Romano Gallo; Fernando A. Soares Coelho1 1 Apresentada ao ix Congresso Brasileiro de Ciência do Solo, realizado em Fortaleza, Ceará, de 15 a 23 de julho de 1963.
SUMMARY
An analytical procedure for the determination of small concentrations of copper and zinc by 2-carboxy-2'hydroxy-5'-sulfoiormazylbenzene (Zincon) method in leaf samples is described. Copper and zinc are measured colorimetrically after they are separated from other elements by extraction with dithizone from a solution prepared by wet digestion of one-gram sample of dry plant material with a mixture of HN03H2S04HClO4.
The method as outlined here is sufficiently sensitive and accurate in the analysis of leaves for diagnosis of nutritional deficiencies of these elements, being suitable for concentrations of 5 to 30 ppm in plant material. Color is formed at a reagent concentration of 4.5 x 105M and a wave length of 590mm is used for analytical measurements.
Analyses by the spectrophotometry procedure reported are faster and the results compare with the Polarographic method.
Texto completo disponível apenas em PDF.
Full text available only in PDF format.
Recebida para publicação em 12 de fevereiro de 1965.
Datas de Publicação
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Publicação nesta coleção
19 Fev 2010 -
Data do Fascículo
1965
