According to the national standardGB 11893-89, it specifies that under neutral conditions, potassium persulfate is used to digest the sample, and all phosphorus is oxidized to orthophosphate; under acidic conditions, orthophosphate reacts with ammonium molybdate, and in the presence of antimony salt, phosphomolybdenum heteropoly acid is formed, which is immediately reduced by ascorbic acid to produce a blue complex, and the total phosphorus content is determined by spectrophotometry; at the same time,the standardHJ636-2012 specifies the determination of total nitrogen in water quality by alkaline potassium persulfate digestion UV spectrophotometry. The principle of the method is that under 120-124°C, alkaline potassium persulfate converts nitrogen-containing compounds in the sample into nitrate, and the total nitrogen content can be determined by UV-visible spectrophotometry. This instrument mainly refers to these two standards to achieve automated determination of total phosphorus and total nitrogen.

Product Technical Advantages:

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

2. It can achieve semi-automatic batch addition of oxidizing agents and standard solutions, as well as the digestion step; it can also automatically perform operations such as adding reagents, constant volume, mixing, detection, cleaning of the colorimetric cell, and data analysis after semi-automatic digestion;

3. It simulates manual mixing mode to avoid contamination or loss caused by blowing or suction mixing modes;

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

5. High-precision injection pumps are used for reagent addition to avoid low precision issues caused by peristaltic pumps;

6. It achieves automatic opening and closing of the digestion bottle cap, with automatic control of digestion time;

7. It automatically draws standard curves and intelligently dilutes samples proportionally;

8. Experiments are conducted in batches, with each group performing experiments, improving experimental efficiency compared to single experiments;

9. The instrument can be expanded to detect ammonia nitrogen, nitrates, and other water quality testing items.

Contact our sales team to obtain method validation reports for total phosphorus, total nitrogen, and other testing items!