High range plus, chemical oxygen demand determinations: COD Digestion Vials, High Range Plus Method: Reactor Digestion, Hach Method 8000 Range: 200 -15000 mg/L COD pk/25 NOTE: THIS METHOD IS NOT USEPA APPROVED COD Digestion Vials, Low Range Method: Reactor Digestion Chemical Oxygen Demand (COD): US EPA approved for wastewater analysis using Hach Method 8000 Range: 0-150 mg/L COD