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Determinación de micronutrientes en hojas de café

by Fragoso, M.A.C; Ferreira, L.A.B.
Publisher: Oct-Dic 1967Subject(s): OLIGOELEMENTOS | CONTENIDO DE NUTRIENTES | HIERRO | MANGANESO | HOJAS | METODOS | TIOCIANATOS | CONTAMINANTES | SULFATO DE COBRE | MICRONUTRIENTES | COLORIMETRIA | TRACE ELEMENTS | IRON | MANGANESE | LEAVES | METHODS | THIOCYANATES | POLLUTANTS | COPPER SULPHATE | MICRONUTRIENTS | COLORIMETRY | OLIGOELEMENT | FER | MANGANESE | FEUILLE | METHODE | THIOCYANATE | POLLUANT | SULFATE DE CUIVRE | COLORIMETRIE In: Café (Perú) v. 8(4) p. 4-14Summary: Higher copper contamination on leaf tissue results from copper sulfate sprays. Plant materials so contaminated often require adoption of special analytical procedures. A revision of colorimetric routine techniques for individual determination of micronutrients was found necessary. Manganese and iron were firstly considered. A procedure based on the periodate method proved suitable for manganese and a thiocyanate technique with ethyl acetate as the extractant in the presence of acetone, was introduced for iron determination. From a test sample of ground coffee-tree leaves highly contaminated with copper sulfate, nitro-sulfuric-perchloric acid digests were obtained, on wich repeated measurements for manganese and iron estimation were carried out for reproductibility studies
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Dat. num. 9 ref. Sum. (En)

Higher copper contamination on leaf tissue results from copper sulfate sprays. Plant materials so contaminated often require adoption of special analytical procedures. A revision of colorimetric routine techniques for individual determination of micronutrients was found necessary. Manganese and iron were firstly considered. A procedure based on the periodate method proved suitable for manganese and a thiocyanate technique with ethyl acetate as the extractant in the presence of acetone, was introduced for iron determination. From a test sample of ground coffee-tree leaves highly contaminated with copper sulfate, nitro-sulfuric-perchloric acid digests were obtained, on wich repeated measurements for manganese and iron estimation were carried out for reproductibility studies

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