Quote Originally Posted by fcfrey View Post
As an aside for Richard --- I was wondering about buying the J (1/4 lb) of the R-0870 DPD Powder --- If I vacuum pack and/or freeze it will it keep??
I do a LOT of Chlorine Testing and have used 3 of the I size (10g) since late July.
Unfortunately, I do not know the answer to that. I wouldn't freeze it, but if you keep it in a cool dark place it should last longer. I just don't know how long nor how sensitive, but my hunch is that only the titrating reagent is sensitive and the others should last much longer. Sorry I don't know more. Perhaps somebody else knows.