BZT mixing

[Colin Graham]

I've been trying to mix a simple 2% solution of benzotriazole and keep getting a needle/crystalline precipitate when mixed with 125 degree water. Better to use cold water or could the chemical be off somehow? Hate to keep wasting it. Thanks for any help.

 

[Peter Schrager]

Benzo

You need to first mix it up with about 200ml of iso-propyl alcohol. Than bring it to the needed quantity. It will stay suspended in this solution indefinately.
Peter Schrager

 

[David A. Goldfarb]

It doesn't dissolve easily in water. Mix a 1% solution and use twice as much, which is what I do, or dissolve in something like alcohol.

 

[Colin Graham]

Great! Thanks very much.

 

[Ian Grant]

The normal way to make up a 2% Benzotriazole solution is:

2% Benzotriazole / 10% Sodium Carbonate solution (Ilford IBT)
Kodak's version was 3% Benzotriazole with sodiun Sulhite.

Benzotriazole will dissolve easily in water above 52°C

Ian

 

[David A. Goldfarb]

Edwal Liquid Orthazite is also 3% with sulfite.