We store the solution under refrigeration at 2-5 degree Centrigrade. We no
longer use NaOBr, but LiOBr which is much more stable.
We keep the HDPE bottle of solution out only long enough to pipet the liquid
into Rittenburg tubes, then return it to the refrigerator. Our reagent
Br2(liquid) is kept sealed and under refrigeration. Keep it (Br2) and the
reagent solution in a fume hood when mixing up the NaOBr solution.
According the literature, NaOBr should be stable for six months with
refrigeration. Some colleagues from Seoul, Korea, however, said
that their solutions only lasted for one month. There may be either a problem
with the refrigerator temperature, with the chemicals, or their distilled water.
It might do well to boil the water used to make the solution for fifteen minutes
to remove free ammonia, and then cover it while it cools. I think it best to
make up the NaOBr solution with cooled water since the reaction of NaOH and Br2
produces some heat. Be sure to keep the chemicals, especially
the Br2 in the fume hood. Wear rubber gloves and other pertinent protective
gear. Br2 vapor is very corrosive and very damaging to the lungs!
Please be careful !!
If you have further questions, please contact me.