Analysis of the Effect of Improvement of Automatic Kjeldahl Analyzer
Experimental teaching in colleges and universities, as well as food, food inspection, food, feed and other testing departments widely used automatic Kjeldahl nitrogen analyzer, which is a relatively high cost protein measurement equipment. However, the automatic Kjeldahl nitrogen analyzer used in hard water and water shortage areas has two very outstanding disadvantages: First, tap water is prone to scale in the steam generator and between the electrode rings, which not only results in the steam output of the distiller. Unstable, and often due to pipeline plugging, the experiment was interrupted; second, tap water passed through the cooling system and was discharged directly into the sewer, causing a lot of wasted water.
A 10L water tank was installed in the upper left side of the automatic Kjeldahl nitrogen analyzer. A water filling funnel was welded at the center of the upper tank. An inlet pipe at the right end of the tank was connected to the outlet port at the lower left of the smoother; the upper end of the tank was added. A water level buoy; the water outlet below the water tank is connected to the water inlet of the electromagnetic pump through the outlet pipe. The outlet of the electromagnetic pump is connected to the inlet of the smoother and the water valve and the condensing pipe through the three-way pipe and the T-type three-way pipe respectively. The water valve is connected with the distiller through a dilution water conduit, and the condensate outlet is connected with the upper side of the water tank. We only added one tank and changed the path of the internal pipeline.
In order to measure the accuracy of the automatic Kjeldahl nitrogen analyzer after changing to deionized water for cooling water and steam water supply, 100 mL of each of the 3 samples with different protein content were measured. Each sample was measured in parallel for 3 times to determine the protein content. Control experiment. The improved nitrogen determination instrument effectively solved the problem of wasted water and scale blocking the pipeline, greatly improved the detection efficiency, and the detection accuracy was not significantly different from that of the original fixed nitrogen analyzer. The method is simple and easy to implement, and the improvement cost is low. It is very suitable for a laboratory that owns the nitrogen determination instrument to reform itself, and also provides a useful reference for the instrument manufacturer to further improve the applicability of this type of nitrogen determination instrument.
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