For determination of Total and Acid-Hydrolyzable Phosphorus (Phosphate) by the PhosVer® 3 Ascorbic Acid method with Acid Hydrolysis and Persulfate Digestion. Hach Method 8180. Range: 0.06 - 3.50 mg/L PO4. Test 'N Tube™ Reagent Set contains reagents for sample digestion and photometric analyses. Up to 50 tests.
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Perform digestions and photometric measurements in the same vial.