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Titolo:
VARIABLES INFLUENCING THE DIRECT DETERMINATION OF HALOACETIC ACIDS INWATER BY REVERSED-PHASE ION-PAIR CHROMATOGRAPHY WITH INDIRECT UV DETECTION
Autore:
VICHOT R; FURTON KG;
Indirizzi:
FLORIDA INT UNIV,DEPT CHEM MIAMI FL 33199 FLORIDA INT UNIV,DEPT CHEM MIAMI FL 33199
Titolo Testata:
Journal of liquid chromatography
fascicolo: 20, volume: 17, anno: 1994,
pagine: 4405 - 4429
SICI:
0148-3919(1994)17:20<4405:VITDDO>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERFORMANCE LIQUID-CHROMATOGRAPHY; PARTITION CHROMATOGRAPHY; INTERACTION REAGENTS; RETENTION MECHANISM; HOMOLOGOUS SERIES; INORGANIC ANIONS; MOBILE PHASE; SYSTEM PEAKS; SEPARATION; VISUALIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
R. Vichot e K.G. Furton, "VARIABLES INFLUENCING THE DIRECT DETERMINATION OF HALOACETIC ACIDS INWATER BY REVERSED-PHASE ION-PAIR CHROMATOGRAPHY WITH INDIRECT UV DETECTION", Journal of liquid chromatography, 17(20), 1994, pp. 4405-4429

Abstract

A reversed-phase ion-pair chromatographic system for the direct determination of haloacetic acids in water has been optimized utilizing indirect photometric detection. Acetic, chloroacetic, bromoacetic, iodoacetic, dichloroacetic and dibromoacetic acids were used to characterizethe chromatographic system. The effect of temperature on retention time shows a non linear van't Hoff behavior indicating a change in the mechanism of retention at about 30 degrees C. Above 30 degrees C, retention times decreased proportionally to increases in the temperature ofthe column. Separations are achieved in the pH range of 3.5 to 6.3 with an optimum at ca. pH 5.4. Increases in the concentrations of KH2PO4, 1-hexanesulfonate (competing ion) and acetonitrile result in proportional decreases in capacity factors with some selectivity variations depending on the analyte. Increases in the concentration of benzyltributylammonium ion (ion interaction reagent) resulted in increases in capacity factors with a usable range from 8 to 12 mM. Of the reversed phases studied, Spherisorb C-18 yielded the optimal results for the acidsstudied. Linear calibration curves for these acids were obtained utilizing indirect UV detection with detection limits as low as 2 parts per million.

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Documento generato il 06/07/20 alle ore 05:08:19