Detection principle:

COD：Measure the total absorbance of unreduced Cr6+and reduced Cr3+at a certain wavelength in a low range. Measure the absorbance of Cr3+produced by reduction at a certain wavelength under high range. After calculation by the microcomputer chip, the COD content (mg/L) is directly displayed.

Ammonia nitrogen:Ammonia nitrogen, which exists in the form of free ammonia or ammonium ions, reacts with Nessler's reagent to form a yellow brown complex. The absorbance of this complex is proportional to the ammonia nitrogen content and is measured at a wavelength of 420nm. After calculation by the microcomputer chip, the ammonia nitrogen content (mg/L) is directly displayed.

Total phosphorus:Add persulfate to the sample to convert all phosphorus in the solution into orthophosphate. The orthophosphate in the sample reacts with ammonium molybdate in an acidic medium in the presence of antimony salt to form phosphomolybdic acid, which is immediately reduced by ascorbic acid to form a blue complex. Measure the absorbance at 700nm. After calculation by the microcomputer chip, the total phosphorus content (mg/L) is directly displayed.

Total nitrogen:Add alkaline persulfate to the sample to convert nitrogen into nitrate nitrogen. Under strong acidic conditions, nitrate nitrogen reacts with the color reagent to form a brownish yellow complex, and its absorbance is measured at a certain wavelength. After calculation by the microcomputer chip, the total nitrogen content (mg/L) is directly displayed.

Technical parameters:

Product features:

1. Using the EPA approved method in the United States, in accordance with HJ/T399-2007, the measurement is accurate and effective.

2. Adopting imported high brightness and long-life cold light source, with excellent optical performance and a light source lifespan of up to 100000 hours.

3. Large LCD screen with full Chinese display, direct data reading, simple and time-saving operation.

4. Integrated digestion and colorimetric analysis, no need to replace the tube, simple and fast measurement, and no safety hazards.

5. It can save 80 standard curves and 1800 measured values (date, time, parameters, test data).

6. Memory standard working curve, users can also calibrate the curve as needed.

7. One click factory reset, which can quickly recover in case of curve loss caused by misoperation.

8. It has data storage function and power-off protection function, making it convenient to query historical data and prevent data loss.

9. Equipped with a USB interface, data can be transferred to the computer for long-term storage.

10. It has a printing function, which can immediately print the measured values or query historical records for printing.

11. The digestion instrument adopts intelligent PID temperature control technology and a dual anti overheating protection system, ensuring safe and uniform heating with fast speed. Used for the digestion of COD, total phosphorus, total nitrogen and other projects.

Standard configuration: