MadHatter
International Hazard
Posts: 1332
Registered: 9-7-2004
Location: Maine
Member Is Offline
Mood: Enjoying retirement
|
|
Indigo Carmine Oxidation
I suspect that my bottle of indigo carmine solution has undergone oxidation because
over a period of several months it changed from its deep blue color to purple. I keep it
in a 250 ml reagent bottle with a frosted glass stopper. Does anybody know if this
substance reacts to visible light ? I ask because it seems unlikely that oxygen could
get past that stopper. One possible culprit is the electrostatic air purifier I keep in my
room. It produces trace amounts of ozone.
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
|
|
|
sparkgap
International Hazard
Posts: 1234
Registered: 16-1-2005
Location: not where you think
Member Is Offline
Mood: chaotropic
|
|
MSDS says it's light sensitive...
http://www.jtbaker.com/msds/englishhtml/i1440.htm
UV is the worst offender for this compound.
(edit)
Oh, and it oxidizes easy, too...
sparky
P.S. Next time, use an amber bottle. Photodegradation really is a drag...
[Edited on 23-1-2005 by sparkgap]
|
|
|
Marvin
National Hazard
Posts: 995
Registered: 13-10-2002
Member Is Offline
Mood: No Mood
|
|
Microbial action, and a dozen other 'natural' things will also reduce it, but this should reoxidise on contact with air.
|
|
|
MadHatter
International Hazard
Posts: 1332
Registered: 9-7-2004
Location: Maine
Member Is Offline
Mood: Enjoying retirement
|
|
Indigo Carmine
Sparkgap, thanks for the info. I have plenty of IC in solid form to make more solution.
The light sensitivity aspect took me by surprise considering this compound is often
used as a dye. That's probably the case because I don't think oxygen or ozone will get
by that stopper easily.
Since this particular batch has already changed to purple, I'll let it continue to see
the longer term effects and report back on what happens.
Thanks Again !
[Edited on 24-1-2005 by MadHatter]
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
