Estudo comparativo de processos de mineralizacao e de metodos de analise de calcio em folhas de tabaco flue-cured.
1990
Rebelo M.C. | Campos L.S.
PORTUGUES: Porque a tecnica mais avancada de determinacao de calcio em material foliar e a espectrofotometria de absorcao atomica, propomo-nos comparar os teores deste catiao determinado por esta tecnica com os obtidos por complexometria com EDTA em folhas de tabaco flue-cured. Comparamos dois processos de obtencao do extracto da amostra, tendo sido feita a mineralizacao por via humida e por via seca nas mesmas amostras, cujas folhas foram separadas em nervura e parenquima. Concluimos que foi indiferente a preparacao do extracto da amostra por via humida e por via seca e bem assim a tecnica analitica usada para a determinacao do calcio.
Show more [+] Less [-]English. Calcium determinations in plant material by atomic absorption spectrophotometry may present difficulties in the less developed countries of the tropics, on account of the expensive equipment required. So, results of determinations of this element made by this method was compared with that obtained by complexometry with EDTA to evaluate his relative merit. Both the lamina and mibrid of flue-cured tobacco leaves were analysed after being reduced to ashes by wet and dry procedures. It is concluded that dry or wet preparation of the ashes and the analytical method are equivalent.
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