Reagent set, phosphorus digestion

For acid persulfate digestion of samples for Total Phosphorus (Phosphate) determination by Hach photometric methods. Requires additional reagents for measurement of the reactive phosphorus generated by the digestion. Set contains Potassium Persulfate Powder Pillows, Sodium Hydroxide Solution (5.0 N), and Sulfuric Acid (5.25 N). Approximately 100 tests.