Determinação potenciométrica em fluxo de cloreto de cetilpiridinio em desinfectantes bucais

INJECTION ANALYSIS.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 µL and merged downstream with the reagent solution containing 1,0 x10 -5 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 5,0x10 -6 -7,5x10 -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.

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