Ethanol as a blending component for gasoline. Determination of water content. Karl Fischer potentiometric titration method

2021 ◽  
2018 ◽  
Vol 34 (2) ◽  
pp. 23
Author(s):  
Rogério Adelino De Sousa ◽  
Éder Tadeu Gomes Cavalheiro

A potentiometric titration method for the determination of minoxidil based on its redox reaction with K2Cr2O7 is described. The best results were observed using 1.00 x 10-3 mol L-1 K2Cr2O7 and 1.00 x 10-2 mol L-1 minoxidil solutions, and the minoxidil as titrant in 2.00 mol L-1 H2SO4 medium. The method was applied to commercial samples and compared with the results from a chromatographic procedure. Recoveries from 97.4 to 98.7 % were observed depending on the sample. Comparison with the chromatographic procedure reveled agreement within 90% confidence level.


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