JohnBee
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Cleaning glassware...
Anyone know what's best for cleaning glassware?
For the past year, I've been using a chlorine dioxide solution which seemed to work well enough in terms of sanitization. Though I'll soon be out as
it this was left over from a previous project and I won't be ordering more NaClO2.
For what it's worth, I need something that can break down nickel deposits/residue from glassware.
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Zombie
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Here's Sigma's PDF on the subject.
I've run plumbing into my lab for a wash sink, and the logical next step is a dishwasher for basic duty, and following leads like Sigmas for the
stubborn stuff.
https://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/...
[Edited on 5-28-2015 by Zombie]
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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JohnBee
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Awesome thanks!
Any recommendation on a dishwasher?
We currently own a Samsung in our home, but it really sucks at washing glass - lol
The recommendation for Chromic Acid really has be thinking my ClO2 solution was better than I may have first thought. Guess I should look into getting
more NaClO2 as this seems like a safer option. :/
[Edited on 28-5-2015 by JohnBee]
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Metacelsus
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Soap, water, and vigorous scrubbing (with a bottlebrush) works for most things.
For the really stubborn stuff, I have used chloric acid/chlorine dioxide (sodium chlorate dissolved in hydrochloric acid).
Acid (hydrochloric, sulfuric, etc.) should dissolve nickel.
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greenlight
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98% sulphuric is good for getting stubborn stains off.
I usually rinse my quick-fit glass pieces (adapters,stillheads, sep/addition funnels) with a wash bottle of acetone after scrubbing with
soap/detergent water as it cleans any stains left over and gets rid of any grease from the joints which takes ages to wash off with normal soap-water.
I highly recommend the dishwasher as long as the glass is pre-rinsed and cleaned of chemical residue and nothing on them is toxic...I sometimes rinse
my beakers with detergent water well and place them in the Bosch dishwasher I have on the half hour cycle. They come out looking like they are brand
new
Wouldn't use that method if working with anything dangerous or poisonous though.
[Edited on 28-5-2015 by greenlight]
[Edited on 28-5-2015 by greenlight]
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DraconicAcid
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Depends on what is staining it.
The most stubborn stains I get are carbon deposits from the screaming gummi bear reaction. A bit of nitric acid heated with a Bunsen burner usually
takes care of that.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Sulaiman
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I have a slightly unusual situation,
almost all of my glassware I bought 'used' (cheap)
the more I use my glassware the cleaner it gets !
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JohnBee
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Quote: Originally posted by Sulaiman  | I have a slightly unusual situation,
almost all of my glassware I bought 'used' (cheap)
the more I use my glassware the cleaner it gets ! |
Some of the reissue on lab glass can be very stubborn to get off. Is it possible it's slowly eroding with use?
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quantumcorespacealchemyst
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sometimes i soak flasks in BORAX for a while (days, weeks) when they have stuck on stuff and i don't want to waste acids and stuff.
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Zombie
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I just figured whatever cheap dishwasher WalMart sells or Home depot... I like the idea it dries everything, and I don't have to sort anything right
away.
Just something cheap, and small like an apartment size rig.
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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Tdep
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Hey QCSA you're still here! Good to see man, it's always a bit too easy to think the worst for you when you stop posting for a little bit.
/tries to replace thread back onto track
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macckone
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Let's not forget some of the less drastic solvents. Depending on the reaction, isopropyl alcohol, acetone, petroleum distillates, even Colman fuel,
toluene. Vinegar is also sometime useful. We really should have a write up stickied because this comes up so often. Insoluble chloride and sulfates
can sometimes be loosened up with nitric acid. Last resort solutions are piranha and chromic acid. Some insoluble sulfates are minimally soluble in
concentrated sulfuric acid, like lead sulfate.
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Dan Vizine
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My favorite is the lab standard, alcoholic NaOH solution. Actually, KOH is usually used in lab baths, but Red Devil lye is much easier to get and
cheaper. I use Home Depot's denatured alcohol, 1 gallon, about 50 - 100 ml H2O and granular NaOH to the saturation point. It also nicely removes
silicone greases.
For fritted glass, I use conc. H2SO4 and once it's on the frit, I squit in alcohol with swirling to the boiling point. The base bath weakens frits.
[Edited on 4-6-2015 by Dan Vizine]
"All Your Children Are Poor Unfortunate Victims of Lies You Believe, a Plague Upon Your Ignorance that Keeps the Youth from the Truth They
Deserve"...F. Zappa
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