The Kjeldahl nitrogen analyzer is a measuring instrument based on the Kjeldahl nitrogen determination method to determine the nitrogen content of the sample, so the high Kjeldahl nitrogen determination result can be said to be the high Kjeldahl nitrogen determination result, then the Kjeldahl nitrogen determination result What is the reason for the high? After user analysis and discussion, there are mainly the following reasons: User 1: When I did it, the following two situations occurred: 1. Due to operational reasons, the lye was flushed into the cold tube without cleaning, and the next sample would increase significantly, and the other was that the absorption liquid itself was blank. The value will increase without removing it! User 2: When I encountered a digestion (using a digestion furnace), it may be because the water is relatively small, the smoke in the sewage pipe is very large, the protein results are generally high and the difference between the two tests is large, but I have never wanted to understand this. Why is the result high. User 3: There should be lye splashing into the condenser tube and being condensed. I have encountered it before! Try another nitrogen ball with a longer splash tube! User 4: Due to operational reasons, when the lye is flushed into the cold tube and the next sample is not cleaned, it will increase significantly. The other is that the absorption liquid itself has a blank value and will increase if it is not removed! User 5: The above is a summary of the user’s introduction on "What is the reason for the high measurement result of the Kjeldahl nitrogen analyzer". I don’t know what causes this problem during use. I recommend that you understand the instrument in detail before using it. The performance and operation methods of the product are operated in accordance with the requirements of the standard. If the problem still occurs, you can contact the technical staff for assistance.
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â‘ After digestion to a transparent blue-green color, continue to digest for at least 1 hour. The digestive juice must boil during this process.
Note: The determination of an accurate boiling time must be based on a large amount of data obtained by measuring a specific sample with an instrument in a specific laboratory. Generally, a high-protein, high-fat milk sample is selected, and a different boiling time is used after clearing (1 -1.5h) Determine its protein content. The average protein content increases with the increase of boiling time, gradually tends to be constant, and then decreases when the boiling time is longer. Select the boiling time to get the maximum protein.
â‘¡ After digestion, the digestive juice should be transparent. Remove the digestion tube and the vent cap from the digester, and cool it to room temperature. The cooled digestion liquid should be liquid or liquid with a small amount of crystals at the bottom of the tube.
Note: A large number of crystals may be the result of acid loss during the digestion process, which can lead to low test results. In order to reduce the loss of acid, the rate of smoke extraction can be reduced.
â‘¢After the digestion solution is cooled to room temperature, remove the vent cap, slowly add about 20mL of water to each tube (or not), shake it in a vortex to make it fully mixed, ensure that all the separated crystals are dissolved, and then cool down To room temperature.