Potentiometric flow injection determination of cadmium in waste waters including in-line ion-exchange separation/concentration

• Tipo: Artigo em Revista Científica Internacional
• Data: 1998

Autores

Couto, CMCM (Autor) Outra; Lima, JLFC (Autor) FFUP; Conceicao, M (Autor) FFUP; Montenegro, BSM (Autor) Outra; Reis, BF (Autor) Outra; Zagatto, AG (Autor) Outra

Revista

Título: Analytica Chimica Acta

Vol. 366

Páginas: 155-161

ISSN: 0003-2670

Editora: Elsevier

Indexação

ISI Web of Knowledge - 11 Citações

Scopus - 13 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-7NR

DOI: 10.1016/s0003-2670(98)00100-7

Abstract (EN): A flow injection system including an ion exchange resin minicolumn was proposed for potentiometric determination of cadmium. The analyte was preferential and quantitatively retained as chlorocomplex by a strongly basic anion exchange resin (AG 1-X8, 200-400 mesh, chloride form) minicolumn (2.0 cm height, 1.85 mm i.d.) whereas other metallic cations and inert components of the samples were wasted. The retained complexes were further eluted towards detection. The flow-through detector was a cadmium homogeneous crystalline double membrane tubular electrode of increased sensitivity; summation of the potentials related to each membrane was performed by means of an external electronic device. The system was applied to analysis of residual waste waters with cadmium contents within 0.056 and 56.2 mg l(-1). Precise results (r.s.d. about 7%) in agreement with those obtained by flame atomic absorption spectrometry were obtained at a rate of 15-20 determinations per hour.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7