According to the national standardGB 11893-89,the sample is digested with potassium persulfate under neutral conditions, and all the phosphorus contained is oxidized into orthophosphate;under acidic conditions, orthophosphate reacts with molybdate to generate phosphomolybdic heteropolyacid in the presence of antimony salt, which is immediately reduced by ascorbic acid to generate a blue complex, and the total phosphorus content is determined by spectrophotometry;At the same time,the standardHJ636-2012prescribes the determination of total nitrogen in water by alkaline potassium persulfate digestion ultraviolet spectrophotometry. The principle of the method is that at 120-124 degrees, alkaline potassium persulfate converts the nitrogen-containing compounds in the sample into nitrates, and the total nitrogen content can be determined by a UV-visible spectrophotometer. This instrument mainly refers to these two standards and realizes the automated determination of total phosphorus and total nitrogen.

Product technical advantages:

1. It can automatically perform batch sample digestion, cooling, volume setting, mixing, detection, colorimetric cell cleaning, data analysis and other operations throughout the entire process;

2. It can automatically perform batch addition of oxidants, standard solution, and digestion steps in a semi-process; it can also automatically perform operations such as adding reagents, volume setting, mixing, detection, colorimetric cell cleaning, and data analysis after semi-process digestion;

3. It can achieve a mixing mode that simulates human hands to avoid contamination or loss caused by blowing or suction mixing modes;

4. It uses a one-time reagent injection method to minimize reagent cross contamination caused by different experiments;

5. Use a high-precision injection pump to add reagents to avoid the problem of low precision caused by using a peristaltic pump;

6. Automatic opening and closing of the digestion bottle lid and automatic control of the digestion time;

7. Automatic drawing of standard curves and intelligent automatic proportional dilution;

8. The experiment is carried out in batches of 8, which improves the experimental efficiency compared to single experiments;

9. The instrument has the ability to expand the detection of ammonia nitrogen, cyanide and other water quality detection projects.

You can contact our sales to obtain a method validation report for the detection of total phosphorus, total nitrogen and other projects!