I found a method for spectrophotometric determination of methanol in this paper: http://onlinelibrary.wiley.com/doi/10.1002/jccs.201000035/abstract
The process is quite simple: mix 100ml 10%(w/v) Sodium nitroprusside, 100ml 10% (w/v) Potassium ferrocyanide and 100 ml 5% (w/v) NaOH. Dillute to 600ml and mix 1/6 with sample. Wait 15 minutes at RT and measure at 481nm.
It sounded too good to be true but I don't get any color reaction, even remotely, at 481nm in any range of methanol concentrations.
for the determination of methanol by spectrometer method is well recognised.
kindly see : Spectroscopic determination of methanol content in Alcoholic drinks, by H.Vaskova, International Journal of biology and biomedical engineering volume 8, 2014.
This paper is on line available.
In the mentioned paper they use potassium ferricyanide, you talk about p.ferr*o*cyanide, which is not the same material:
p.ferricy. = K3[Fe(CN)6], p.ferrocy. = K4[Fe(CN)6], which contains Fe(III) or Fe(II), resp.
Maybe that's the snag.
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