Kjeldahl nitrogen analyzer is widely used in various laboratories as a commonly used laboratory analytical instrument. When choosing a nitrogen analyzer, whether the instrument has a dual titration mode is an important indicator to measure the performance of the instrument.

There is a very important step in Kjeldahl method for determining protein content - titration. Titration is a chemical experimental operation and also a means of quantitative analysis. It determines the content of a certain solute through the quantitative reaction of two solutions. Kjeldahl method uses acid-base neutralization titration to determine the end point. During the titration process, as the acid in the mixed solution continues to increase, it gets closer and closer to the titration end point. Theoretically, at the moment of reaching the titration end point, the smaller the amount of acid added, the more accurate the measurement result, but if the amount of acid added each time is very small, the titration time required will be very long.

In view of this situation, Kjeldahl apparatus with dual-mode titration is the first choice. This type of nitrogen analyzer supports two titration modes: coarse titration and fine titration. When starting the titration operation, use the coarse titration mode to save titration time. When approaching the titration endpoint, use the fine titration mode to make the measurement result more accurate.