Wet chemical TOC-Analyser The TOC-V WP/WS uses a powerful oxidation technique via combination of sodium persulphate and UV oxidation at 80°C. The highly sensitive NDIR detector in combination with large injection volume leads to excellent reproducibility in the ppb range and low detection limits. Preparation High sense measurement requires a careful preparation of the used tools, the reagents and the standard solution. For this trial all glassware are cleaned with phosphoric acid (5%) and rinsed 5 times with ultra pure water. For each measurement of the standards, the blank value of the glassware with ultra pure water is checked.