Automatic Kjeldahl determination of fishmeal quality on fishmeal

The use of automatic Kjeldahl determination of volatile nitrogen in raw materials, has a simple operation, analysis speed, high degree of automation, as long as the sample is fully crushed and can be directly measured, automatic Kjeldahl determination of 1 Samples take up to 3 minutes, suitable for the determination of large batches of samples. The method has high precision, good accuracy, and high recovery rate. It has certain practicality and reliability for determining the volatility of 1 hm in other animals such as livestock and fish, and is worthy of promotion.

In the prepared fishmeal and meat powder, take a certain concentration of ammonia solution, test according to the wood method, and measure each gradient six times. The result of the determination of the standard recovery rate is between 98% and 102%. The average recovery The rate is 99.6, which meets the testing requirements. Therefore, in the laboratory for the determination of the sample has a higher test requirements for the application of automatic Kjeldahl nitrogen analyzer is more trustworthy.

Repetitive experiments took fishmeal, meat powder, cocoon, and intestinal scum samples, and each sample was tested six times. The standard deviation and coefficient of variation were calculated, indicating that the precision of the automatic Kjeldahl determination method meets the measurement requirements. For each of the above samples, six parallel experiments were performed using the method semi-micro automatic determination method and the automatic Kjeldahl nitrogen determination method. The results showed that there was no significant difference between the two methods on the same sample.

Although there is not much difference between the automatic Kjeldahl analyzer and other methods, the accuracy of the error will be further improved. The numerical value is smaller and more consistent with the quality requirements of the product. At the same time, automation and The degree of intelligence has improved significantly. The automatic Kjeldahl nitrogen analyzer not only has a good measurement effect in volatile nitrogen salts, but also a good instrument selection for the determination of food protein content.

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