Introduction: Closed digestion using a closed digestion tube, in a strong acidic solution, using a special oxidant containing a certain amount of potassium dichromate, under the action of a catalyst at a constant temperature digestion at 165 ° C, so that the reducing substances in the water are oxidized, the water is measured at different wavelengths The absorbance of Cr6+ and Cr3+ in the sample was calculated by absorbance to calculate the COD content in water. Features: 1, in line with HJ/T399-2007, the measurement is accurate and effective. 2, the use of imported high-brightness long-life cold light source, good optical performance, light source life of up to 100,000 hours. 3, large-screen LCD screen, full Chinese display, direct data reading, simple and time-saving operation. 4, digestion colorimetric integration, no need to change the tube, the measurement is simple, fast, no safety hazards. 5. 20 standard curves and 200 measured values (date, time, parameters, test data) can be saved. 6, memory standard working curve, the user can also calibrate the curve as needed. 7. It has a curve covering interference function to prevent misoperation of the overlay curve. 8. It has data storage function and data power-off protection function, which is convenient for querying historical measurement data and preventing data loss. 9. The digestion instrument adopts intelligent PID temperature control technology and double anti-over temperature protection system, which is safe and uniform in heating and fast in speed. Through the digestion of COD, total phosphorus, total nitrogen and other projects. Technical Parameters: Testing standard: HJ/T399-2007 "Determination of water quality chemical oxygen demand rapid digestion spectrophotometry" Measuring range: 0-2000mg/L (segment measurement) Anti-chlorine interference: No effect on chloride ion concentration below 1000mg/L Lower limit of detection: 5mg/L Digestion environment: 165 ° C, 15 min Measurement accuracy: COD>50mg/L, <5%; COD<50mg/L, <10% Measurement time: 20~30 minutes Batch volume: 16/25 water samples Repeatability: <5% Optical stability: 0.001A/20 minutes (100,000 hours life) Colorimetric method: colorimetric tube colorimetric Power supply mode: AC (220V10%), 50Hz Host size: 270mm*220mm*95mm Ambient temperature: 5~40°C Ambient humidity: 85% without condensation Weight: Host <1.4kg, digestion 6kg
Introduction: Closed digestion using a closed digestion tube, in a strong acidic solution, using a special oxidant containing a certain amount of potassium dichromate, under the action of a catalyst at a constant temperature digestion at 165 ° C, so that the reducing substances in the water are oxidized, the water is measured at different wavelengths The absorbance of Cr6+ and Cr3+ in the sample was calculated by absorbance to calculate the COD content in water.
