Phosphorus (Total) TNT Reagent Set, Low Range, 50 tests $121.00 Quantity discounts available QuantityPrice SKU: HAC-2742645 Size : CASE-50 Quantity -+ Add to Cart Details For determination of Total Phosphorus by the PhosVer 3 Ascorbic Acid method with Acid Persulfate Digestion. EPA Compliant Hach Method 8190. Range: 0.0... Details Back Details For determination of Total Phosphorus by the PhosVer 3 Ascorbic Acid method with Acid Persulfate Digestion. EPA Compliant Hach Method 8190. Range: 0.06 - 3.50 mgL PO4.