Why is the volume different for HR+ COD vials versus HR reagents?
Difference between COD HR and HR+ vials
High Range + (0-15,000 mg/L) vials use only 0.2 mL of sample versus the 2 mL of sample in the HR vials. The HR+ vials also have more digestion reagent than the HR vials. The HR+ results are then multiplied by 10 to account for this volume difference.