Determinación de micronutrientes en hojas de café
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
| Main Authors: | , |
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| Format: | biblioteca |
| Published: |
Oct-
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| Subjects: | OLIGOELEMENTOS, CONTENIDO DE NUTRIENTES, HIERRO, MANGANESO, HOJAS, METODOS, TIOCIANATOS, CONTAMINANTES, SULFATO DE COBRE, MICRONUTRIENTES, COLORIMETRIA, |
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| Summary: | 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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