Potentiometric microtitration of vitamin B1 with phosphotungstic acid by using a phosphotungstate-sensitive electrode and its application to the analysis of pharmaceutical preparations
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 119 (10) , 2209-2212
- https://doi.org/10.1039/an9941902209
Abstract
A method for the determination of micro-amounts of vitamin B1 by direct potentiometric titration in aqueous medium with a standard phosphotungstic acid solution is described. A graphite electrode coated with a PVC matrix membrane containing the benzyldimethyltetradecylammonium–phosphotungstate ion association complex as electroactive material and dioctyl phthalate as plasticizer was constructed and used in conjunction with a Ag–AgCl double-junction reference electrode to detect the end-point of the titration. This method gave very satisfactory results in the range 1–4 mg of vitamin B1, also in comparison with other methods; the recoveries were 100.00 ± 0.25% and the mean relative standard deviation was 0.22%. The method was successfully applied to the analysis of pharmaceutical preparations.Keywords
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