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Use of Dinitrophenols in Ion-Pair Extraction Spectrophotometry of Cationic Tensides
Použití dinitrofenolů při iontově párové extrakční spektrofotometrii kationických tenzidů
Bylo ověřeno použití 2,4-dinitrofenolu a 2,6-dinitrofenolu jako činidel při iontově párové extrakční spektrofotometrii kationických tenzidů prováděné zjednodušeným postupem (zkumavkovou metodou). Pro toto ověření byly v roli modelových stanovovaných látek použity čtyři kationické tenzidy. Po určení optimálních podmínek stanovení byl zkoumán vliv molárního přebytku obou činidel na absorbanci chloroformových výtřepků iontových párů. Byly zkonstruovány kalibrační křivky, byly odhadnuty kvantitativní limity a stanoveny zdánlivé molární absorpční koeficienty. Na základě získaných výsledků je možné doporučit oba zkoumané dinitrofenoly jako činidla vhodná ke studovanému účelu.
Klíčová slova:
dinitrofenol – extrakční spektrofotometrie – iontový pár – tenzid
Authors: V. Kubíček
Authors‘ workplace: Univerzita Karlova v Praze, Farmaceutická fakulta v Hradci Králové, Katedra biofyziky a fyzikální chemie
Published in: Čes. slov. Farm., 2005; 54, 82-85
Category: Original Articles
Overview
The application of 2,4-dinitrophenol and 2,6-dinitrophenol as reagents for a ion pair extraction spectrophotometry was tested. The ion pair extraction spectrophotometry experiments were carried out using a simplified procedure (test tube method). Four cationic tensides were used as model analytes. After the optimal conditions of the assay were being determined, the influence of the concentration excess of the reagents on the absorbance of the chloroform extract was investigated. Calibration curves were constructed; an estimation of limits of quantitation was performed and apparent molar absorption coefficients were determined. The obtained results show that both investigated dinitrophenols are suitable for the studied purpose.
Key words:
dinitrophenol – extraction spectrophotometry – ion pair – tenside
Labels
Pharmacy Clinical pharmacology
Article was published inCzech and Slovak Pharmacy
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