| Pages:
1
2 |
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
A related problem is cleaning a mortar. I tried mild abrasives but they didn't work too well. But by adding a little sodium bicarbonate dampened
with water, then grinding away with the pestle, most contaminants can be removed pretty well.
|
|
|
pHzero
Hazard to Self
Posts: 89
Registered: 16-5-2009
Member Is Offline
Mood: Fully substituted
|
|
Peroxymonosulfuric acid
Sulfuric acid+Hydrogen peroxide ---> Peroxymonosulfuric acid, aka pirhana solution. It dissolves pretty much everything, so it should do the
trick. The perxoxy group makes it particularly effective against organic compounds
And I can understand why metabisulfates so effective against MnO2 - it reacts with water to form SO2, which reacts with insoluble MnO2 to make soluble
MnSO4. If you dont have any metabisulfate, i expect if you held the flask over burning sulfur, that'd do the trick too
|
|
|
UnintentionalChaos
International Hazard
Posts: 1454
Registered: 9-12-2006
Location: Mars
Member Is Offline
Mood: Nucleophilic
|
|
I have a very nice heavy ceramic mortar and pestle that ocasionally gets used for powdering oxides and other things that really don't want to come
out. I've tried everything. Base, acid, reducing agents, etc. When I finally give up, I throw a decent amount of moderately coarse white sand in there
and grind until it's a fine powder. A rinse and it looks good as new again. I know I'm removing ceramic, but the walls are so thick, it'll be many
years before that becomes an issue.
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
|
|
|
setback
Hazard to Self
Posts: 50
Registered: 17-5-2009
Member Is Offline
Mood: No Mood
|
|
| Quote: |
Like bisulfites, a solution of hydroxylamine will also quickly remove MnO2; it is added to the digestion mixture post-oxidation
(KMNO4/K2S2O8) when carrying out the EPA analysis for Hg (Hg via cold vapor). |
Hey! I used to do that. In the sample cup goes DI, a minute amount of HNO3, H2SO4, then the KMNO4 and persulfate. Heat it up, cool it down, then add
the hydroxylamine.
Yes, I actually used to use the hydroxylamine to clean up KMNO4 stains, works like a charm.
|
|
|
tahallium
Harmless
Posts: 41
Registered: 24-2-2020
Location: Tunisia
Member Is Offline
|
|
Can I remove traces of Mercury, lead, thallium?
|
|
|
| Pages:
1
2 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
