Question: Can you use rubbing alcohol or nail polish remover for prepping copper for Hydrogen Sulfide test?

Zengirl2 asked on November 30, 2017 20:22
150 | 3 answers | shortlink


Looking to use something that is usually around the house.



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3 Answers

@Zengirl2, I think for the best results you'll want to use acetone, which is easy to find online and in a lot of drug stores and art stores (and maybe even home improvement stores). Acetone is ideal because it is miscible with water and with oil, so it cleans away a variety of kinds of grime. It also dries the surface of the copper since it will dissolve with water and then evaporate. Having a dry surface is probably important to reduce the rate of oxidation of the copper (which I assume, based on electronegativity, interferes with its reactivity with sulfur). Isopropanol has pretty similar properties, but the commonly available rubbing alcohol in drug stores is 70% isopropanol and 30% water. So, that mixture is less effective both at removing any oils, and at leaving a dry surface. You could try both acetone and rubbing alcohol and see if you observe any differences in their effects on the copper.


warren 3 months ago

Hi, Gretchen, what does "miscible with water and with oil" mean? Is it related to what @matej and others learned about the ability to dissolve oil residues in isopropyl rubbing alcohol?

gretchengehrke 3 months ago

Hi @warren, "miscible" means it dissolves with them to create a homogenous mixture (i.e. doesn't separate out like oil and water do). Acetone is a super useful solvent in a lot of laboratory chemistry methods because it is one of a few liquids that has enough polarity to dissolve with water, and enough non-polar bonds to dissolve oils.

Zengirl2 3 months ago

TY for this answer. I'm giving out copper strips at the Factory Farm Summit and hopefully people will be able to share results with us!

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Is nail polish remover just acetone, and is it pure enough for this?

(Except for non-acetone nail polish remover, of course)

https://www.amazon.com/Super-Nail-Pure-Acetone-fl/dp/B009SDJQCI - ~$5 per bottle, though we should probably not mail this around as part of a kit?

Leslie, do you think you could add "or nail polish remover" to the title here so we can sort of hit two birds with one stone in the Q&A for the project? Thank you!!!


Zengirl2 3 months ago

Done @warren :)

Zengirl2 3 months ago

@gretchengehrke will know about the nail polish remover. Unfortunately my nail polish remover is not the standard fare since it is made for the lighter stuff sold at Whole Foods ha!

warren 30 days ago

Hi, @gretchengerhke - would acetone melt nitrile or latex gloves? I'm thinking of how to ship some things like cotton scrub pads and safety gear with these kits.

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Just a note that we'd looked at some single-use acetone nail polish removing pads, because people wouldn't necessarily need a whole bottle -- but at one pad per day per copper piece, that'd get used pretty fast.

Discussion here: https://publiclab.org/questions/warren/11-14-2017/what-s-the-best-setup-for-a-copper-rod-or-copper-plate-test-for-hydrogen-sulfide-detection#answer-687-comment-18134


warren 30 days ago

Copying in that discussion here, as it belongs here more appropriately:

Also thinking of making a kit -- here are individually packaged acetone wipes, although I don't know the concentration: https://www.amazon.com/Nail-Polish-Remover-Pads-Acetone/dp/B0775F6QT1/

If these work to clean the copper plates, they could make it much easier to make/send acetone with kits than sending bottles.

I'm actually having some trouble finding small bottles of acetone nail polish remover... AliExpress also lists the wipes: https://www.aliexpress.com/wholesale?SearchText=nail%20polish%20remover

Also see: https://publiclab.org/questions/Zengirl2/11-30-2017/can-you-use-rubbing-alcohol-for-prepping-copper-for-hydrogen-sulfide-test

@bronwen - i had also thought of buying a larger bottle and separating it into smaller containers, but the fumes would have to be awful, no? I was thinking we might try out the wipes and compare/contrast the results to avoid that, but you're probably right that we could find a well ventilated area to do that in.

bronwen 30 days ago

I think you have to aim to be in a well ventilated area for pads too: pouring acetone might not be too terrible depending on what kinds of bottles you're dispensing to/from, but in general it's not great for you (even in regards to skin contact, which is why there are so many non-acetone containing nail-polish removers out there). I suppose for me it's about scale: packaged wipes might be simpler for sending with kits, but bottles of acetone (which a lot of people have around for all kinds of reasons) would be cheaper for any kind of ongoing project, I would assume.

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