Mixed-Parameter quality control standard for wastewater parameters, high range. Components of the standard solution (with the exception of ammonia) are traceable to SRM from NIST.COD – 500 mg/LPO4-P – 10.0 mg/LNH3-N – 25.0 mg/LNO3-N – 25.0 mg/LTN – 50.0 mg/LApplicable for TNTplus vial tests- TNT822 COD, 20-1500 mg/L O2- TNT825 Hg-free COD, 25-1000 mg/L O2- TNT845 Phosphate, 2-20 mg/L PO4-P- TNT832 Ammonia, 2-47 mg/L NH3-N- TNT836 Nitrate, 5-35 mg/L NO3-N- TNT828 Total Nitrogen, 20-100 mg/L TN