Wastewater Effluent Inorganics Quality Control Standard. Ready to use; no dilutions required. Mixed standard contains: Ammonia Nitrogen: 2 mg/L NH3-N, Nitrate Nitrogen: 4 mg/L NO3 - -N, COD: 25 mg/L, Phosphate: 2 mg/L PO4 3- . Sulfate: 50 mg/L SO4 2- . TOC: 8 mg/L. 500 mL Bottle. Hach…