Distillation and absorption are carried out in a micro Kjeldahl Nitrogen Analyzer. There are many types of Kjeldahl distillation devices, which are generally composed of three parts: steam generation, ammonia distillation, and ammonia absorption. For the washing of the instrument, Kjeldahl Nitrogen Analyzer manufacturers tell you that before the instrument is installed, all parts need to be cleaned by general methods. The rubber tube and stopper used must be immersed in 10% NaOH solution, boiled for about 10 minutes, washed with water, boiled for 10 minutes, and then washed with water Several times, then install and fix it on an iron stand.

The distillation and absorption in Kjeldahl Nitrogen Analyzer

Kjeldahl Nitrogen Analyzer manufacturers tell you that before the instrument is used, all the traces of the pipeline must be washed with steam to remove the possible residual ammonia in the pipeline. For the instrument in use, steam washing for 5 minutes is sufficient before each sample measurement. For instruments that have not been used for a long time, repeat the steam washing, not less than three times, and check whether the instrument is normal.
Kjeldahl Nitrogen Analyzer manufacturers tell you that check each connection carefully to ensure no air leaks. First, add about 2/3 volume of distilled water to the steam generator, add a few drops of sulfuric acid to keep it acidic to avoid the ammonia in the water being steamed out and affecting the result, and put a little zeolite (or capillary, etc.) to prevent boiling. Add about 20 mL of distilled water along the wall of the small glass to allow the water to flow into the reaction chamber through the cannula, but the water in the glass should not be exposed to light.
Kjeldahl Nitrogen Analyzer manufacturers tell you that after the steam occurs, immediately turn off the switch on the waste liquid discharge pipe, so that the steam can only enter the reaction chamber, causing the water in the reaction chamber to boil rapidly, and the evaporated steam enters the upper port of the reaction chamber through the nitrogen-fixing ball The condensing pipe is cooled, and a conical flask is placed at the lower end of the condensing pipe to receive the condensed water. Start timing when the nitrogen-fixing ball is hot, cook continuously for 5 minutes, and then remove the gas lamp.
Kjeldahl Nitrogen Analyzer manufacturers tell you that after flushing, clamp the connecting rubber tube between the steam generator and the collector. Due to the reduction of the gas cooling pressure, the waste liquid in the reaction chamber is automatically pumped into the reaction chamber shell, and the waste liquid discharge port is opened to release the clip. waste liquid. Clean for 2 to 3 times in this way, and then place a conical flask containing a mixture of boric acid-indicator under the condensing tube so that the lower mouth of the condensing tube is completely immersed in the solution, distill for 1 to 2 minutes, and observe the solution in the conical flask. Is it discolored? If there is no discoloration, it means that the inside of the distillation unit has been cleaned. Remove the conical flask, re-distill for 1-2 minutes, rinse the lower port of the condenser with distilled water, turn off the gas lamp, and the instrument can be used for the test sample.
Through the above introduction and analysis of the distillation and absorption in Kjeldahl Nitrogen Analyzer, hope it helps you.

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