Volume 26, Number 4, May 1998Proche Infrarouge PIR
|Page(s)||182 - 186|
Construction and evaluation of a crystalline silver double-membrane tubular potentiometric detector for flow injection analysis. Application to chloride determination in wineC.M.C.M. Couto, J.L.F.C. Lima and M.C.B.S.M. Montenegro
CEQUP, Departamento de Química-Física, Faculdade de Farmácia (UP), Rua Aníbal Cunha 164- 4050 Porto, Portugal
This paper describes the construction and assessment of the operating characteristics and analytical usefulness of a homogeneous crystalline silver double membrane tubular electrode with increased sensitivity. The constructed electrodes allowed Ag(I) determinations in the M range with a calibration slope of 114 mV dec-1 and with good reproducibility (0.6 mV). The development and application of a flow injection analysis system manifold for chloride determinations in wine samples, in a wide concentration range ( 10 - 800 mg L-1), with a titrant consumption of 90 g determination-1 is also described. The results obtained from the analysis of 12 wine samples showed good agreement between the proposed method and the refer-ence one, accomplishing 90 - 200 samples h-1
Key words: Tubular electrode / increased sensitivity / chloride / wine / FIA.
© EDP Sciences, Wiley-VCH 1998