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At present, although there are many automatic Kjeldahl analyzers available on the market, some titrators still use the photoelectric method of determining the filters and diodes. The result of this determination is largely deviated. Actual value. The ZDDN-II automatic Kjeldahl nitrogen determination instrument developed by Top Cloud Yunnong not only absorbs the advantages of similar products at home and abroad, but also adopts the internationally recognized standard judgment method - color judgment method when titrating. Make the test result of the sample very reliable.
Top Cloud Agrochemical Kjeldahl is an imported color sensor that uses stable and reliable red, green and blue primary colors to judge, and displays three curves, standard acid titer, and protein (nitrogen) content in real time, which can help users Real-time monitoring of distillation, calculation, titration process, making users know what to do. This method effectively replaces the traditional electrode potential method and a single colorimetric method. Next, let's take a look at how the Topp Cloud Agronomy Kjeldahl meter completes the titration process during the experiment.
In the experiment, the sample was titrated after completing the distillation of the sample and the blank. First, titration was performed using an acid microtiter tube with a standard hydrochloric acid solution of 0.0100 mol/L. When the solution is dripped into the bottle and the solution is dark gray, rinse the periphery of the Erlenmeyer flask with distilled water once. If it is green after shaking, it should be carefully dropped half a standard hydrochloric acid solution, shaking observation of the color change in the solution bottle, dark gray unchanged within a minute or two, when it is regarded as reaching the end of the titration. If pink, indicating that the titration endpoint has been exceeded, 0.02 mL can be subtracted from the amount of standard hydrochloric acid solution that has been titrated. The color of the endpoint of the nitrogen determination must be identical for each sample. The color of the solution in the receiving flask of the blank control solution was unchanged or slightly changed and no green color could be detected. Record the milliliters of standard hydrochloric acid solution for each titration for final calculations.
This not only simplifies the titration process of the sample, but also ensures the accuracy and reliability of the sample measurement results. Therefore, in the determination of the nitrogen content of our sample, it is wise to choose the ZDDN-II automatic Kjeldahl nitrogen analyzer which uses the color judgment method as the titration method.
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