Nitrate TNTplus chemistry and your Hach spectrophotometer are engineered to simplify water analysis for accurate results, everytime.For determination of Nitrate Nitrogen by the Dimethylphenol Method in wastewater, drinking water, surface water and process waters. TNT835 nitrate reagents have a reporting range of 0.23 to 13.50 mg/L NO3–N or 1.00 to 60.00 mg/L NO3. The Dimethylphenol Method is more accuracte than traditional cadmium reduction methods, and eliminates the use of heavy metals for reduction. TNT822 follows Hach Methodology 10206 and is EPA approved under 40 CFR 141. Switch to simpler, more accuracte nitrate testing with Hach TNTplus reagents. USEPA approved for compliance monitoring under the Safe Drinking Water Act.