Xinzhuang pioneered the optical and acoustic fault alarm system of Kjeldahl
Principle The organic compound is co-heated with sulfuric acid to convert the nitrogen therein to ammonium sulfate. In this step, potassium sulfate is often added to the mixture to increase the boiling point of the intermediate product. The end of the analysis process of the sample is well judged because the mixture will become colorless and transparent (very dark at the beginning) by adding a small amount of sodium hydroxide to the resulting solution and then distilling. This step converts the ammonium salt to ammonia. The total ammonia amount (determined directly by the nitrogen content of the sample) is determined by the back titration method: the end of the condenser tube is immersed in the boric acid solution. Ammonia reacts with the acid, while excess acid uses sodium carbonate under the direction of methyl orange. The results obtained by titration are multiplied by a specific conversion factor to obtain the result.
Scope of application Kjeldahl instrument uses the Kjeldahl method to detect ammonia, protein nitrogen, phenol, volatile fatty acids, cyanide, sulfur dioxide, ethanol in grains, food, feed, water, soil, sludge, sediments and chemicals. Equal content. It has a very good cost performance, and only the titration process requires manual operation, which is very suitable for routine testing in laboratories and inspection agencies. Widely used in the analysis of nitrogen or protein content of food, crops, seeds, soil, fertilizer and other samples.
Kjeldahl nitrogen characteristics
1. The operation is extremely simple and can be quickly programmed with one-button operation. There are different language menus to choose from.2. Equipped with optical and acoustic fault alarm system. The digestive tract is not in place or placed incorrectly, the safety door is not closed, the instrument does not start, the acid, alkali, and diluent are missing. The host can quickly detect and suspend the experiment, and the automatic alarm prompts, extremely convenient, safe and reliable.
3. Door contact safety switch.
4. Programmable reaction and distillation time.
5. Automatic steam power generation. Steam power generation can be adjusted from 40% to 100%.
6. Measurement range: 0.1-200mg
7. Nitrogen recovery rate of 99.5%
8. Repeatability ± 1%
9. Distill between standby operations.
10. Independent cleaning program.
11. Automatic and manual addition of sodium hydroxide.
12. RS232 interface.
13. Condensate consumption: 5 l / min
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