Shen ChangHong According to different test standards, ammonia nitrogen tester has a and B types. Among them, type A uses Nessler's Reagent Colorimetry gb7479-87; type B uses salicylic acid photometry as the basic test method in accordance with national standard gb7148-81 and international iso7150 / 1-1948, supplemented by sample colorimetric reaction pretreatment, to achieve rapid and accurate colorimetric determination of samples, which has the advantages of stability, sensitivity, reliability and mercury free.
Nessler's reagent method
The content of ammonia nitrogen in drinking water, surface water, groundwater, domestic sewage and industrial wastewater can be determined by Nessler reagent method. Measurement range: 0.05-5.00mg/l, 5.0-25.0mg/l.
Measurement principle of Nessler's reagent method
Ammonia nitrogen in the form of free ammonia or ammonium ion reacts with Nessler's reagent to form a reddish brown complex. The absorbance of the complex is directly proportional to the content of ammonia nitrogen. The colorimetric measurement is carried out at the wavelength of 420nm.
Analysis steps of ammonia nitrogen Nash colorimetry:
(1) Preparation of ammonia nitrogen reagent and water sample
Put water sample into each ammonia nitrogen tube, add 2 drops of reagent 1 and 3 reagent 2 according to the instructions, tighten the bottle cap, develop the color for 10 minutes and test on the machine.
(3) Ammonia nitrogen colorimetric determination
Shenchanghong's ammonia nitrogen tester (nh-5n / 6N / cn-201 / 201a / cnp-301 / 301c / 301D / cnpn-401 / 401c / 401d / mulp-8c / pmulp-8, etc.), select the corresponding ammonia nitrogen test program in the main menu, do not need to re-establish the standard curve, just put the ammonia nitrogen test tube after color rendering into the tester to read the ammonia nitrogen value in concentration units, and save the record results.
Brief introduction of the analysis system of ammonia nitrogen Nessler colorimetry
The NH3-N Nessler colorimetric analysis system provided by shenchanghong includes the main machine of NH3-N analyzer and the matching NH3-N reagent.
(1) Instrument host: according to the needs of different customers, shenchanghong company can provide a variety of models of ammonia nitrogen analyzer for the determination of ammonia nitrogen.
Features of shenchanghong ammonia nitrogen analyzer:
● no need to prepare ammonia nitrogen reagent: the reagent prepared by a certain proportion of chemical components required for ammonia nitrogen analysis can greatly save the preparation time of ammonia nitrogen reagent;
● time saving: the whole analysis process, including water sampling, dropping reagent, colorimetric determination and other steps, takes much less time than traditional methods;
● simple operation and easy to learn: the operation guide with pictures and texts is convenient for mastering the analysis method of ammonia nitrogen in a short time.
