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Titolo:
Simultaneous determination of halide and thiocyanate ions by potentiometric precipitation titration and multivariate calibration
Autore:
Ni, YN; Wu, AG;
Indirizzi:
Nanchang Univ, Dept Chem, Jiangxi 330047, Nanchang, Peoples R China Nanchang Univ Jiangxi Nanchang Peoples R China 330047 ng, Peoples R China
Titolo Testata:
ANALYTICA CHIMICA ACTA
fascicolo: 1-3, volume: 390, anno: 1999,
pagine: 117 - 123
SICI:
0003-2670(19990519)390:1-3<117:SDOHAT>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORTHOGONAL ARRAY DESIGN; CHEMOMETRIC METHOD; MICROWAVE DISSOLUTION; BIOLOGICAL SAMPLES; OPTIMIZATION; DIFFERENTIATION;
Keywords:
potentiometric precipitation titration; halide and thiocyanate; multivariate calibration; partial least squares;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Ni, YN Nanchang Univ, Dept Chem, Jiangxi 330047, Nanchang, Peoples R ChinaNanchang Univ Jiangxi Nanchang Peoples R China 330047 ples R China
Citazione:
Y.N. Ni e A.G. Wu, "Simultaneous determination of halide and thiocyanate ions by potentiometric precipitation titration and multivariate calibration", ANALYT CHIM, 390(1-3), 1999, pp. 117-123

Abstract

Halide and thiocyanate ions can be determined by a precipitation titrationwith silver nitrate as the titrant, and the end-point can be evaluated by a potentiometric method, in which generally a silver indicator electrode isused as the indicator electrode and a double-junction Ag-AgCl electrode asthe reference electrode. However, when mixtures of halide and thiocyanate are titrated, it is difficult to determine these components individually for there are overlapping steps in the potentiometric titration curves, especially in the case that there are obvious differences between concentrationsof the components. In this paper, the linear equation for the potentiometric precipitation titration of a mixture of halide and thiocyanate ions was developed and it was then used for determining the components in the mixtures simultaneously with the aid of multivariate calibration methods. By application of this model, 27 synthetic mixtures with three- and four-componentcombinations of chloride, bromide, iodide and thiocyanate with low concentration levels from 1.8x10(-4) to 6.2x10(-4) mol l(-1) were analyzed and acceptable results were obtained. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 10/07/20 alle ore 00:18:38