Online total phosphorus/total nitrogen analyzerThe determination method generally adopts the method of separately measuring organic nitrogen and inorganic nitrogen compounds (ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen) and then adding them up, as well as the method of potassium persulfate oxidation ultraviolet spectrophotometry (GB11894-89).

Online total phosphorus/total nitrogen analyzerThe principle of potassium persulfate oxidation UV spectrophotometry is that in an aqueous solution above 60 ℃, potassium persulfate can decompose to produce potassium bisulfate and atomic oxygen. Potassium bisulfate dissociates in the solution to produce hydrogen ions, and the dissociated atomic oxygen can convert nitrogen containing chloride compounds in water samples into nitrate at 120-124 ℃,

Check the calibration standard curve based on the A value and calculate the total nitrogen (as NO)₃-The content of N is calculated.
This method is applicable for the determination of total nitrogen in surface water and groundwater, with a low detectable concentration of 0.050mg/L and an upper limit of 4mg/L. When the iodine ion is more than 2.2 times the total nitrogen content and the bromide ion is more than 3.4 times the total nitrogen content, it will interfere with the measurement.