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Take a sample of synthetic ammonia plant wastewater, take a sample of water 10ml, directly into the reaction chamber, according to the KDN-04C automatic determination method of nitrogen determination in parallel 6 times, with the national standard method (titration) parallel determination of 2 times, absorption of the bottle of boric acid Absorption solution absorbs ammonia, the indicator turns blue-green, and the temperature increases, must be titrated with hydrochloric acid standard solution at any time to maintain the solution is neutral (the indicator maintains the original purple-red), until the absorption solution remains purple-red unchanged At the end point, note that the volume of the hydrochloric acid standard solution needs to be controlled by an appropriate pumping speed of the KDN-04C automatic nitrogen determination device, constantly absorbing liquid ammonia and titrating to maintain a neutral absorption solution, so as to achieve the best absorption effect. Suction that is too small will affect absorption and titration, and it is advisable to produce foam absorbers continuously. In order to increase the absorption of ammonia, the ammonia content is added to a volume of hydrochloric acid standard solution according to the sample. KDN-04C automatic nitrogen determination instrument parallel experiments, but also according to the first use of hydrochloric acid liquid products, add hydrochloric acid standard solution consumes 90%, in order to facilitate absorption.
The results obtained with the KDN-04C automatic nitrogen determination instrument for wastewaters with different ammonia nitrogen content were all in accordance with the standards and were within the specified measurement range. As a continuous measurement method is used, ammonia can be titrated with hydrochloric acid for titration without using a standard curve for analysis. This further improves the speed of the automatic nitrogen determination test, especially for the analysis of fertilizer production. .
Determination of Ammonia Concentration of Wastewater with Automatic Nitrogen Determinator
The automatic nitrogen determination device is mainly heated by steam under the evacuation operation condition, so that the ammonia portion will be volatilized under the alkaline conditions. The temperature of the generating device of the instrument in general test can be controlled at 90°C, otherwise it will make the boiling too violent and lead to the bad effect of temperature ammonia absorption and more volatilization, which will have a great impact on the titration result, too late to detect . Conversely, if the temperature of the KDN-04C automatic nitrogen analyzer is too low, the reaction speed will be too slow to affect the test efficiency.