Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Staining TLC plates with iodine - Why use silica or sand?
alchemizt
Harmless
*




Posts: 36
Registered: 28-1-2019
Member Is Offline


[*] posted on 9-2-2022 at 22:16
Staining TLC plates with iodine - Why use silica or sand?


Whats the purpose of mixing iodine crystals with sand or silica or alumina when setting up a chamber to stain TLC plates? Why not just use pure iodine?
View user's profile View All Posts By User
Boffis
International Hazard
*****




Posts: 1705
Registered: 1-5-2011
Member Is Offline

Mood: No Mood

[*] posted on 9-2-2022 at 23:31


I suspect its to increase the surface area of exposed iodine to increase the rate of evaporation but you would need to grind the iodine with the dilutant to disperse it.
View user's profile View All Posts By User
Tsjerk
International Hazard
*****




Posts: 2782
Registered: 20-4-2005
Location: Netherlands
Member Is Offline

Mood: Mood

[*] posted on 10-2-2022 at 00:22


Maybe after a couple of uses the iodine unsublimes (that is the opposite of sublime right?) On the sand, making the surface area larger?
View user's profile View All Posts By User
CharlieA
International Hazard
*****




Posts: 617
Registered: 11-8-2015
Location: Missouri, USA
Member Is Offline

Mood: No Mood

[*] posted on 18-4-2022 at 13:52


Quote: Originally posted by alchemizt  
Whats the purpose of mixing iodine crystals with sand or silica or alumina when setting up a chamber to stain TLC plates? Why not just use pure iodine?


Do you have a literature reference that you are following? Thanks
View user's profile View All Posts By User
AvBaeyer
International Hazard
*****




Posts: 618
Registered: 25-2-2014
Location: CA
Member Is Offline

Mood: No Mood

[*] posted on 18-4-2022 at 18:06


I have used the I2-silica gel method and it works no better than just some iodine in a jar. I have never quite figured out why the dispersion of iodine on silica is recommended.

AvB
View user's profile View All Posts By User

  Go To Top