Change to read:
Oxidizable substances
To 100 mL, add 10 mL of 2 N sulfuric acid, and heat to boiling. Add
0.2 mL
USP29 of
0.1 N
USP29 potassium permanganate, and boil for 5 minutes. The pink color does not completely disappear; or alternatively follow the test method for
Total Organic Carbon 643.