SciELO - Scientific Electronic Library Online

vol.30 issue3Thermal behaviour of 1,4-bis(3-carboxy-3-oxo-prop-1-en-1-yl)benzene compounds with Ag+ and Pb2+ author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Eclética Química

Print version ISSN 0100-4670On-line version ISSN 1678-4618


SOUSA, R. A. de; SEMAAN, F. S.; BAIO, J. A. F.  and  CAVALHEIRO, E. T. G.. Fast determination of minoxidil by photometric flow titration. Eclet. Quím. [online]. 2005, vol.30, n.3, pp.79-84. ISSN 0100-4670.

A photometric flow titration based on the redox reaction between KMnO4 and minoxidil is described. The best titration results were observed at 3.20 x 10-4 mol L-1 KMnO4 and 1.00 x 10-3 mol L-1 minoxidil, using the minoxidil solutions as titrant. The flow rate was fixed at 17 mL min-1 and the titrant was added to the system in aliquots of 500 µL, the color changes were monitored at 550 nm. The method was applied to commercial samples and compared with the results from a chromatographic procedure. Recoveries from 97.6 to 102.8 % were observed depending on the sample. Comparison with the chromatographic procedure reveled relative errors of 3.5 - 4.0 %.

Keywords : minoxidil determination; photometric titration; flow titration.

        · abstract in Portuguese     · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License