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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

TORAL, M. INES; LARA, NELSON; GOMEZ, JAVIER  e  RICHTER, PABLO. DETERMINACION DE HIERRO EN FASE SOLIDA POR ESPECTROFOTOMETRIA DERIVADA DE SEGUNDO ORDEN. Bol. Soc. Chil. Quím. [online]. 2001, vol.46, n.1, pp.51-60. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442001000100009.

A microdetermination of iron at sub-mg/L level by derivative spectrophotometry has been developed. The compound TPTZ (2,4,6-tripyridyl-1,3,5-triazine) was used as chromogenic reagent to form a blue complex (pH = 5.0), which is fixed and concentrated on a cation-exchange resin sp sephadex C-25. The influence of experimental variables on the retention of the complex on sp sephadex C-25 is discussed. The signals in derivative units were measured directly on the resin, packed in a 1 mm spectrophotometric cell. The characteristic amplitude of the signal at 660 nm in second-derivative spectra is useful for quantitative determination of iron. (0,241-120 ng/mL; RDS < 2,7 %). The method was applied to the iron determination in different types of water

Palavras-chave : Determination of iron; Second-derivative spectrophotometric; Preconcentration; Solid-phase; Waters.

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