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Titolo:
DETECTION OF FLOW-INJECTION ANALYSIS WITH PH GRADIENT BY ACOUSTOOPTICTUNABLE FILTER BASED SPECTROPHOTOMETRY
Autore:
PASQUINI C; LU J; TRAN CD; SMIRNOV S;
Indirizzi:
MARQUETTE UNIV,DEPT CHEM,POB 1881 MILWAUKEE WI 53201 MARQUETTE UNIV,DEPT CHEM MILWAUKEE WI 53201 UNIV ESTADUAL CAMPINAS,INST CHEM BR-13081970 CAMPINAS SP BRAZIL
Titolo Testata:
Analytica chimica acta
fascicolo: 3, volume: 319, anno: 1996,
pagine: 315 - 324
SICI:
0003-2670(1996)319:3<315:DOFAWP>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
WEAK ACIDS; EQUILIBRIA; TITRATIONS;
Keywords:
ACOUSTOOPTIC TUNABLE FILTER; FLOW INJECTION; MULTIVARIATE CALIBRATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
C. Pasquini et al., "DETECTION OF FLOW-INJECTION ANALYSIS WITH PH GRADIENT BY ACOUSTOOPTICTUNABLE FILTER BASED SPECTROPHOTOMETRY", Analytica chimica acta, 319(3), 1996, pp. 315-324

Abstract

The instrumentation development of a spectrophotometer based on an acousto-optic tunable filter (AOTF) and its applications in a flow-injection (FI) system for gradient exploitation is described. This compact,all-solid state spectrophotometer which contains no-moving parts, canbe scanned in the visible region (390-650 nm) at a speed of 300 nm/s. The fast scanning capability of the instrument made it possible to monitor the spectral response of an acid-base indicator mixture. The recorded spectra of the indicators were then converted to pH by means of a partial least square (PLS) multivariate calibration technique. With use of the same indicator mixture, the relationship obtained facilitates the determination of pH of any now-injection pH gradient system which is produced by injecting a strong acid or base over a mixture of buffered solutions with a wide range of pH values. The time versus pH relationship can, therefore, be readily established for any buffer-reagent mixture flowing in the Fl system. The FI system, which has been calibrated this way, can then be used to rapidly characterize the behavior of chemical systems as a function of pH. Two examples are demonstrated in this work: the determination of the pK(a) of the weak acids and of the complex formation between iron(III) and sulfosalicylic acid.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 12:09:17