Detection principle:

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.

Nitrous nitrogen:Add alkaline persulfate to the sample to generate a brownish yellow complex, which converts nitrogen in the sample into nitrate nitrogen. Under strong acidic conditions, measure the absorbance of nitrate nitrogen at 410nm. After calculation by the microcomputer chip, the nitrate nitrogen content (mg/L) is directly displayed.

Nitrous nitrogen:In a phosphoric acid medium with a pH value of 1.8 ± 0.3, nitrite reacts with p-aminobenzenesulfonamide to form diazonium salts, which are then coupled with N - (1-naphthyl) - ethylenediamine to form a red dye. The absorbance is measured by spectrophotometry, and the nitrite content (mg/L) is directly displayed after processing and calculation by a microcomputer chip.

Technical parameters:

Product features:

1. Use the authoritative industry standard "Color changing Acid spectrophotometric method"HJ535-2009、GB7493-87Accurate and effective measurement.

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. 5-inch LCD screen, 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: