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

• Type: Article in International Scientific Journal
• Date: 1998

Authors

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

Journal

Title: Analytica Chimica Acta

Vol. 366

Pages: 155-161

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 13 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7