As a hot-selling product of Shanghai Bashu, Kelly's nitrogen analyzer is invited by engineers to explain the function and principle of Kjeldahl nitrogen analyzer.
First, the role of Kjeldahl nitrogen analyzer:
Kjeldahl analyzer uses the Kjeldahl method to detect ammonia, protein nitrogen, phenol, volatile fatty acids, cyanide, sulfur dioxide, and ethanol in grains, food, feed, water, soil, sludge, sediment, and chemicals. It has a very good cost performance, and only the titration process requires manual operation, which is very suitable for routine testing in laboratories and inspection agencies. Widely used in the analysis of nitrogen or protein content of food, crops, seeds, soil, fertilizer and other samples.
Second, the principle of Kjeldahl
When Kjeldahl method is used to determine the sample, it needs to be subjected to three processes of digestion, distillation and titration. The digestion of the sample is to heat and digest the nitrogen-containing organic compound together with sulfuric acid and the catalyst to decompose the organic nitrogen, and the decomposed ammonia is combined with sulfuric acid. The generated sulfuric acid is converted into inorganic nitrogen by digesting the sample, and the digested sample is added to a nitrogen analyzer distiller for alkali hydrolysis.
Kjeldahl nitrogen analyzer is to complete the alkaline decompression process of inorganic nitrogen, that is, the alkali solution is added to the sulfuric acid after digestion, and the alkali solution distillation is carried out under hot steam, as follows:
Kjeldahl nitrogen analyzer can automatically complete the quantitative alkali addition, acid addition and automatic distillation process. When the sample to be tested is completely digested, the ammonia gas and water vapor released in the reaction are condensed through the condensation tube and collected. The boric acid absorbing solution (containing methyl red-oxocresol green mixed nitrogen indicator) is finally titrated with a standard acid solution.
The above is the full content of "The role and principle of Kjeldahl nitrogen analyzer", if you want to know more about the information about the nitrogen analyzer, you can always contact Shanghai Baqi Industrial Co., Ltd. for consultation!
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