Total nitrogen detector

　　Total nitrogen detectorAdopting high-performance light sources, it has the characteristics of high measurement accuracy and good stability. Resolve various stray light interference, large screen LCD Chinese display, user-friendly display interface, easy operation, with storage/waterproof function. Mainly used for laboratory testing in various industries, sewage treatment, universities, and research institutions; Widely used for water quality determination of surface water, groundwater, domestic sewage, and industrial wastewater.

After highly dissolving in the presence of potassium persulfate, all nitrogen-containing compounds in the water sample are converted to nitrate nitrogen, cooled to room temperature, and reacted with the indicator to form colored complexes. Detecting the color change and converting it into a total nitrogen output, the amount of colored complex generated is equivalent to the total nitrogen content.

1. The total nitrogen detector can quickly and accurately detect the total nitrogen content in water and directly read the concentration.

2. Adopting high brightness and long-life light source, the service life of the light source can reach 100000 hours.

3. Large screen LCD Chinese display, all settings, calibration, and recording operations are implemented in an integrated environment.

4. Can you save 1?? 00 standard curves and 5000 measurement values (date, time, parameters, and test data).

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

6. The operation interface is more user-friendly, with the function of restoring factory settings when standard curves are lost.

7. It has data power-off protection function and data storage function, and can query measurement records at any time.

8. The shell is made of sheet metal, which is beautiful, atmospheric, and durable.

9. Separate the testing instrument from the digestion instrument to avoid the influence of high temperature on the optical system.

10. The digestion instrument is generally used for the digestion of COD, total phosphorus, total nitrogen and other items; Intelligent PID temperature control technology ensures uniform heating and fast heating speed.

The total nitrogen detector is an intelligent instrument that detects the total nitrogen content in water quality, with fast speed and low cost, and has greater potential in the field of water quality monitoring. It has a Chinese operating interface, a large screen guide menu, and LCD display. Full wavelength automatic scanning can directly measure more than 30 indicators. It can directly measure more than 30 parameters such as cod, ammonia nitrogen, total nitrogen, total phosphorus, turbidity, etc. The curve can be automatically calculated and established based on national standard samples. Equipped with self built experiments and dynamic tests, with high-end UV spectrophotometer functionality. It can transfer current and historical data to a PC and print it.

How does a total nitrogen detector determine total nitrogen?

1. Water sample pretreatment: When measuring total nitrogen in surface water, the total nitrogen analyzer generally needs to place the collected water sample in a polyethylene bottle, add concentrated sulfuric acid as a fixative, adjust the pH value to 1~2,4, and store it in the refrigerator.

2. Sample collection and preservation: Collect samples according to relevant regulations. The collected samples are stored in polyethylene bottles or hard glass bottles. Adjust the pH to 1-2 using concentrated sulfuric acid (H2SO4=1.84g/ml). They can be stored at room temperature for 7 days. It can be stored in polyethylene bottles and frozen at -20 degrees for one month.

3. Sample preparation: Take an appropriate amount of sample and adjust the pH value to 5-9 with sodium hydroxide solution (NaOH=20g/L) or sulfuric acid solution (1+35).

4. Interference and elimination:

When the iodine ion content is greater than 2.2 times the total nitrogen and the bromide ion content is greater than 3.4 times the total nitrogen, it will interfere with the measurement. Hexavalent chromium ions and trivalent iron ions in water samples interfere with the determination, which can be eliminated by adding 1-2ml of 5% hydroxylamine hydrochloride solution.