Operation method and technical characteristics of ammonia nitrogen detector
The ammonia nitrogen detector uses the Nessler colorimetric method to measure ammonia nitrogen in water. The method has the characteristics of simple operation and high sensitivity. The principle is that ammonia nitrogen in the form of free ammonia or ammonium ions reacts with sodium reagent to form a yellow-brown complex, and the color of the complex is proportional to the content of ammonia nitrogen.
Ammonia nitrogen detector according to standards
Designed according to Nessler's reagent colorimetric method GB 7479-87, the operation is simple and the value is accurate.
working principle
The ammonia nitrogen in the form of free ammonia or ammonium ions reacts with the Nessler reagent to form a reddish-brown complex. The absorbance of the complex is proportional to the ammonia nitrogen content, and the absorbance is measured at a wavelength of 420 nm.
Technical characteristics
(1) Rapid and accurate determination of the concentration of ammonia nitrogen in wastewater;
(2) Cold light source, independent wavelength;
(3) Support two colorimetric methods of cuvette and colorimetric tube;
(4) Simple operation and direct reading of concentration;
(5) Support historical data storage (date, time, parameters, measurement results);
(6) Built-in curve, which can be automatically corrected and saved;
(7) Print or upload current data and all stored historical data;
Method of operation
Take 10 ml of water sample, add 2 ml of reagent, leave it at room temperature for 10 minutes, and use a 10 mm cuvette for colorimetry.
Eliminate interference
Removal of residual chlorine
If residual chlorine is present in the sample, it can be removed by adding an appropriate amount of sodium thiosulfate solution (Ï=3.5 g/L). Each 0.5 ml can remove 0.25 mg of residual chlorine. The starch-potassium iodide test paper was used to check whether the residual chlorine was removed.
Flocculation precipitation
Add 1 ml of zinc sulphate solution (100 g/L) and 0.1~0.2 ml of sodium hydroxide solution (Ï=250 g/L) to 100 ml of sample, adjust the pH to about 10.5, mix, place to precipitate, and pour Supernatant analysis. If necessary, filter with medium speed filter paper washed with water and discard 20 ml of the initial filtrate. The sample after flocculation can also be centrifuged.
Predistillation
Transfer 50 ml of boric acid solution (Ï=20 g/L) into the receiving bottle to ensure that the condenser outlet is below the level of the boric acid solution. Divate 250 ml of the sample, transfer it to the flask, add a few drops of bromothymol blue indicator (Ï = 0.5 g / L), if necessary, with sodium hydroxide solution (c (NaOH) = 1 mol / L) or hydrochloric acid Solution (c(HCl)=1 mol/L) adjust the pH to 6.0 (the indicator is yellow) ~ 7.4 (the indicator is blue), add 0.25 g of light magnesium oxide and several glass beads, immediately connect the nitrogen ball and Condensate tube. Heat the distillation to make the distillate rate about 10 ml/min. When the distillate reaches 200 ml, stop the distillation and bring up to 250 ml with water.
standard
The provisions contained in the following standards constitute provisions of this standard by reference in this standard.
GB3097-82 seawater quality standard
GB3838-88 surface water environmental quality standard
GB8703-88 radiation protection regulations
concept
Sewage: A general term for water discharged during production and living activities.
Displacement: refers to the amount of water that is directly used in process production during the production process. Does not include indirect cooling water, plant boilers, power station drainage.
All pollutant discharge units: refers to all pollutant discharge units included in the scope of application of this standard.
Other pollutant discharge units: refers to all pollutant discharge units except for the listed industries in a certain control project.
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