NOTA
Determinação de cobalto em plantas pelo método espectrofotométrico de 2-nitroso-1-naftol1 1 Pesquisa realizada com auxílio do Banco Nacional de Desenvolvimento Econômico, Fundepro-42. Trabalho apresentado na XXIV Reunião Anual da Sociedade Brasileira para o Progresso da Ciência, realizada em São Paulo - SP, de 2 a 8 de julho de 1972.
Determination of cobalt in plants by the 2-nitroso-1-naphthol method
Pedro Roberto Furlani2 2 Com bolsas de suplementação do C.N.Pq. ; José Romano Gallo2 2 Com bolsas de suplementação do C.N.Pq.
SUMMARY
A spectrophotometric method for the cobalt determination in plant material was studied, using 2-nitroso-1-naphthol.
Immediate formation of a stable complex is obtained when the reaction is conducted at pH between 7.0 and 8.5.
The procedure involves adding triethanolamine solution in order to eliminate manganese interference, and after extraction in an organic phase, the absorbance of the complex is measured at 360-365 nm.
The 2-nitroso-1-naphthol method was suitable to determine cobalt in the range of 0.5-5.0 microgram per 4 ml of isoamylacetate, as organic solvent. The accuracy was evaluated by the coefficient of variation (about 3.75%) and by the recovery of cobalt added to the extracts of plant materials (about 97.9%).
Texto completo disponível apenas em PDF.
Full text available only in PDF format.
Recebido para publicação em 8 de maio de 1977.
Datas de Publicação
-
Publicação nesta coleção
21 Dez 2007 -
Data do Fascículo
1978
