At the same time, this indicator has also been applied to the evaluation of animal-derived feed products. The test was conducted by KDN-08A automatic Kjeldahl determination of nitrogen in the alkaline solution, and the volatile acidity of the animal feed was calculated using standard acid titration. Instrument conditions: The analytical procedure was set for automatic Kjeldahl determination: 30 ml for the absorption solution, 60 ml for distilled water, 0 ml for the lye, and stirring mode. Sample Preparation Prepare the sample according to the feed sampling method. The particle size of the sample must be over 95% at one time and over 40 mesh at a time. The sample should be fully mixed after being crushed and the lower sieve should be placed in a sealed bag for use. Grinding can not produce heat when grinding.
Animal-based feed products are rich in protein, and are prone to spoilage due to the action of microorganisms, causing protein decomposition to produce basic nitrogenous substances such as ammonia and amines, which are volatile nitrogen-based substances. These substances are volatile, and the KDN-08A automatic Kjeldahl nitrogen determination method is used to evaporate volatile nitrogen-based substances in an alkaline environment. After receiving it with boric acid, it is titrated with standard hydrochloric acid to calculate its content. Is the TVBN value.
In the animal-derived feed, a certain concentration of (NH3)SO4 solution was taken and tested according to the KDN-08A automatic Kjeldahl method. The results of the determination of the recovery rate of the spiked sample were found to be 6 times. Between 98% and 102%, the average recovery rate was 99.6%, which met the testing requirements. This can not meet the requirements of the test for many instruments and methods in the past. It also shows that the KDN-08A automatic Kjeldahl tester has a satisfactory result in the determination of this indicator, and for other Measurement and promotion bring certain advantages.
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