Colorimetric determination of ethanol in the presence of methanol and other species in aqueous solution.
Ethanol is coupled with diazotized p-aminobenzoic acid, to give a coloured product with maximum absorption at 436 nm. The coloured product has a molar absorptivity of 1.02 x 10(4)l.mole(-1).cm(-1) and Beer's law is obeyed over the range 0.5-4.0 mug/ml. The relative standard deviation is less than 4.76% and the relative errors are within -2.89-3.9%. The suggested method is rapid, simple, selective and sensitive.
Rahim
S A
SA
Department of Chemistry, College of Science, Mosul University, Mosul, Iraq.
Geeso
S G
SG