Oxidisable substance is complies at 0.4 to 0.9 ml of 0.02 molor potassium permanganet for EDI outlet PW water

GOOD VALIDATION PRACTICE (cGVP)
1

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

2

The USP requirement for ‘oxidisable substances’ in purified water (PW) or water for injection (WFI) has been supplanted by the acceptance criteria for TOC which is now 500 ppb maximum.