determine small amount methanol in solutions

Sep 2013
2
0
i like homebrewing but i don't know how to realize my homemade alcohol is safe even existing small volume of methanol has high risk to make someone blind i have tested my alcohol with red litmus paper but methanol and ethanol bout of them make it blue so this not good method. i added dicromate potasium to methanol but i didn't smell acrid from that sample so i found out it was not good method.pleasetell me a confident method to determine methanol in my homemade alcohol or any other sample.i want to drink that.
 
Last edited by a moderator:
Feb 2013
154
4
Michigan
Testing for methanol

We can disitinguish between methanol and ethanol using the iodoform test which is easy to do without special equipment:
http://www.nuffieldfoundation.org/practical-chemistry/test-distinguish-between-ethanol-and-methanol
Detecting traces of methanol in a mixture would require more sophisticated methods such as IR spectroscopy. A somewhat simpler method involves reaction between the alcohol and HI:
http://dalspace.library.dal.ca/bitstream/handle/10222/13268/v18_p1_a2_King_Bell_ detection_methanol_presence_ethyl_alcohol.pdf?sequence=1
 
Sep 2013
2
0
thank you,you gave two method to distinguish between methanol and ethanol my solution is a homemade alcohol a copmlex of water and ethanol ormaybe METHANOL so thefirst method is confident to recognize amall volume of methanol in my alcohol or it is ok for large volume of methanol i mean first method using idodine and NAOH.
 
May 2010
491
8
Hi melika 444.
There is no danger that you will produce methanol but acetic acid or ethyl acetate are possibillities