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How to test for methanol?

  1. any simple test to test for the present of methanol?
     
  2. jcsd
  3. movies

    movies 284
    Science Advisor

    Do you have access to NMR or GC? Those would definitely be the fastest methods.
     
  4. Are you testing for the presence of methanol in a solution of different compounds or are you testing to see whether a pure sample is methanol or not? If you have a solution of different compounds, assuming they have boiling points that are fairly different you could do a simple distillation, you know the temperature at which methanol boils so if something boils off at that temperature you could assume its methanol and then do a comparative TLC to be sure, or an IR. If you have a pure sample you could do again do a simple co-TLC, or you could do an IR spectra of it.....ect.
     
  5. ShawnD

    ShawnD 986
    Science Advisor

    Add something like potassium permanganate (condy's crystals) or potassium dichromate. If it makes a horrible smell, it's probably methanol.
     
  6. i am carrying one experiment on the decomposition of sweetener-Aspartame under acidic condition which will give out methanol
    is it easy to test for the present of methanol there by adding potassium permanganate?
     
    Last edited: Jan 4, 2006
  7. Monique

    Monique 4,700
    Staff Emeritus
    Science Advisor
    Gold Member

    :bugeye: do tell us the results! I'd suggest a GC if you have access to one, as a control spike a sample of your solution with some methanol.
     
  8. but in my school lab, we don't have a GC or NMR. is there other simple test for present of methanol?
     
  9. I am actually doing that same experiment in school. Try and oxidising it useing pottasium dichromate. This way you should be able to confirm methanol
     
  10. My question is on Methonal too

    I am trying to figure out a way to tell if there is any contaminates in the Methonal I am currently using? How can I test to make sure I have 100% Methanol?

    Also how can I test to make sure I have only Methanol and Di Water and nothing else?

    thanks
     
  11. I am testing for the absence of all alcohols (mainly methanol, butanol and propanol) within a compound with the exeption of ethanol. Have you any advice?
     
  12. What other types of compounds are in your solution? Potassium permanganate or potassium dichromate can be used to oxidize alcohols to their carboxylic acids which can be identified by their foul smells. The problem is that you will also oxidize other organic compounds like aldehydes, alkenes, etc.
     
  13. Did you try using your nose? Its the simplest test i can think of :P
     
  14. I want a quick test for the presence of methanol as a contaminate. But since my solution is an experimental ferment, and may also contain ethanol and aldehydes, I assume the suggested use of potassium permanganate or dichromate would not work to show the presence of methanol as an impurity (because ethanol and aldehydes would give similar [false-positive] odors). Correct?

    I don't have access to the lab equipment, and I have briefly checked around the winemaking suppliers and have found no quick test procedures or strips, even though methanol is a problem impurity in homemade wine. Along the way, I found this good group and hope for some suggestions; maybe, if all fails, the contact information for an analytical lab that would test a sample?

    thanks

    mark
     
  15. This sounds scary. Methanol is toxic, and acidic conditions can create methanol from aspartame? I hope you mean organic acids, because if you mean HCl, then a lot of people should be dying from drinking diet soft drinks ;).
     
  16. Another question about methanol ----->

    Where could I take a sample of a "drinking alcohol" to be tested for methanol contamination?
     
  17. chemisttree

    chemisttree 3,723
    Science Advisor
    Homework Helper
    Gold Member

    Where (in the world) are you? In the Yellow Pages look under 'Laboratories-Testing'. Call the labs with the biggest ads first. The smaller guys (with no GC equipment) will outsource your job to the big guys and mark up the price. It may cost you about $100 for the test. About the same price as a VERY excellent bottle of 18 yr old imported scotch. And there will be no methanol there my friend!

    Sometimes methanol is added to ethanol to 'denature' it. This renders the drinking alcohol useless (or dangerous) for consumption and so this form of alcohol is not taxed as is most drinking alcohols. It cannot be economically rendered safe to drink. That is the point of adding methanol to drinking alcohol. Better to use the money you will spend on the test(s) to buy a legal bottle (if you are old enough).
     
  18. How long does methanol stay in your system if you accidentaly consume small amounts? (about .10 ml)
     
    Last edited: Jul 25, 2007
  19. That's a worrisome post...I don't know the answer but I would be more concerned about possible damage while it is in your system. From wikipedia:
    I've been wondering how to test for acetone or methanol since it is standard practice at my lab to handle both with latex gloves. I recently read that latex gloves are very permeable to these solvents and shouldn't be used with them, so I was actually wondering yesterday how I could try to test how much methanol or acetone will permeate the glove...I guess it sounds like there's not really a very good way?
     
  20. For methanol, you can safely wear nitriles, but for acetone the only really resistant glove material I've found is rubber.
     
  21. How did you (assuming you did) ingest this amount of methanol? I don't think 0.1mL should pose much of a threat, but I'm not a doctor or anything. Best to call poison control because it'll keep you from having to worry. Blindness can occur at levels lower than the fatal ones stated in gabee's post. The best antidote is probably to drink alcohol (ethanol) because apparently your body can then process in a safer manner.

    I've been very scared of ingesting a bit of methanol while boiling solutions of it. Of course I do this outside and try to stay away as much as possible, but it's not the same as a hood.
     
    Last edited: Jul 25, 2007
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