Washing method of Kjeldahl Nitrogen Analyzer


Time of issue:

2021-09-15

The washing method of the Kjeldahl Nitrogen Analyzer instrument is as follows: Before installation of the Kjeldahl Nitrogen Analyzer, all parts are cleaned by the usual method. The rubber tube and plug used in the Kjeldahl Nitrogen Analyzer need to be immersed in 10% NaOH solution, boiled for about 10 minutes, washed with water, boiled for 10 minutes, washed with water several times, and then installed and fixed on an iron stand.

The washing method of the Kjeldahl Nitrogen Analyzer instrument is as follows:
Before installation of the Kjeldahl Nitrogen Analyzer, all parts are cleaned by the usual method. The rubber tube and plug used in the Kjeldahl Nitrogen Analyzer need to be immersed in 10% NaOH solution, boiled for about 10 minutes, washed with water, boiled for 10 minutes, washed with water several times, and then installed and fixed on an iron stand.

Kjeldahl Nitrogen Analyzer china

Before the Kjeldahl Nitrogen Analyzer can be used, trace amounts of all pipes must be washed with steam to remove possible residual ammonia in the pipes. For the Kjeldahl Nitrogen Analyzer in use, steam washing for 5 minutes is sufficient before each sample measurement. For Kjeldahl Nitrogen Analyzers 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.

Carefully check all connections of the Kjeldahl Nitrogen Analyzer to ensure that no air leaks. First, add about 2/3 volume of distilled water to the steam generator of the Kjeldahl Nitrogen Analyzer, add a few drops of sulfuric acid to keep it acidic, so as to avoid the ammonia in the water being steamed out and affecting the results, and put a little zeolite (or capillary, etc.), To prevent boiling.

After rinsing, clamp the connecting rubber tube between the steam generator and the collector of the Kjeldahl Nitrogen Analyzer. 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 outlet clip is opened to release the waste liquid.

Clean the Kjeldahl Nitrogen Analyzer 2 to 3 times in this way, and then place a conical flask containing a boric acid-indicator mixture 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 inside of the conical flask. whether the solution changes color. 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 Kjeldahl Nitrogen Analyzer can be used for the test sample.

Through the above introduction and analysis of the washing method of the Kjeldahl Nitrogen Analyzer, hope it helps you.