standarderization of BEC 0.004M

[bdhedhy19]

Hi,
I need to do the standardization or shelf life study for Benzethonium Chloride 0.004M, since vendor does not give expiration date for the previously opened bottle. Only Fisher gives the shelf life statement for previously opened bottle, but unfortunately fisher does not make this chemical. We got it from RICCA and after opening the bottle, we have to discard this, until we do the shelf life study or we can validate the re-standardization procedure, before using it again. If anyone knows of any procedure, would be great help.
Thanks and have a wonderful weekend:)

[Consumer Products Guy]

Do your standardization v. best quality sodium lauryl sulfate, like from BDH. Use dimidium bromide-disulphine blue indicator.

Try CTL Scientific Supply Corp 888-686-3454
#44244-1 for sodium lauryl sulfate
#19189 for the indicator

[bdhedhy19]

Thanks!