what is usp limit for oxidisable substance for edi outlet water (PW water)
in 100 ml water sample
10 ml of 1 molar sulpheric acid +0.1 ml of 0.02 molar potassium permangnet
then pink water should come for complying USp. But some times pink colour is coming after 0.5 to 0.9 ml of potassium permanganet.
what is max limit