Potentiometric determination of cetylpyridinium chloride in oral desinfectants by flow injection analysis [Determinação potenciométrica em fluxo de cloreto de cetilpiridinio em desinfectantes bucais]

• Type: Article in International Scientific Journal
• Date: 2003

Authors

Baptista, PCS (Author) Other; Araujo, AN (Author) FFUP; Montenegro, MDCBSM (Author) FFUP

Journal

Title: Quimica Nova

Vol. 26 No. 4

Pages: 475-478

ISSN: 0100-4042

Publisher: Sociedade Brasileira de Quimica

Indexing

ISI Web of Knowledge

Scopus - 5 Citations

Other information

Authenticus ID: P-007-C06

Abstract (EN): The work describes a new procedure for cetylpyridinium chloride determination in oral disinfectants, based on a flow-injection system with potentiometric detection. The determination was based on the measurement of picrate concentration decrease as result of ion-pair reaction with the analyte present in the injected sample. In the optimised set-up the sample injection volume was kept at 400 ¿L and merged downstream with the reagent solution containing 1,0 × 105 mol/L of picrate adjusted to pH 5.0 with citrate/citric acid buffer. The flow rate was fixed at 8 mL/min and the reactor length at 40 cm. The proposed procedure enables the determination of cetylpyridinium in the analytical range of 5,0 × 106 - 7,5 × 10-5 mol/L at a sampling rate of 60/h. The results for real samples had a precision better than 3% and were comparable to the labelled values.

Language: Portuguese

Type (Professor's evaluation): Scientific