DISSOLVED OXYGEN.[16][65][68][71b][99][100c][120]
_Reagents._—1. Sulfuric acid, concentrated. (Sp. gr. 1.83–1.84.)
2. Potassium permanganate. Dissolve 6.32 grams of the salt in water and
dilute the solution to 1 liter.
Standard methods for the examination of water and sewage · 第 144 / 249 题