1. Which industries are the main applications of the azotometer?
Answer: The azotometer is an automatic instrument that can independently determine the nitrogen content according to the classical Kjeldahl method. It is widely used in the analysis and determination of crude protein in grain, food, feed, soil, fertilizer, water, sediment, chemicals, dairy products, brewing, sugar, medicine, coal, rubber and other substances.
2. What are the common faults and solutions in the use of azotometer?
Answer: 1. The alkali pump and pipeline are blocked, and the instrument should be cleaned and maintained frequently after use.
2. The service life of steam generator is short. Distilled water or pure water must be used in the steam generator to avoid the generation of scale.
3. What is the difference between the automatic azotometer and the traditional manual method?
Answer: After setting the corresponding laboratory conditions, the automatic azotometer does not need human intervention in the whole experiment process. It has many advantages, such as fast test speed, high efficiency, good parallelism of sample test results, low risk factor and so on.
4. How to ensure the recovery rate of samples?
Answer: The main factors affecting the recovery rate are distillation time, whether the addition of alkali and boric acid is excessive, whether the digestion is complete, and the tightness of the instrument. Cooling water flow, pressure and temperature are too high.
5. What does the sample recovery rate represent?
Answer: The sample recovery rate represents the accuracy of the instrument, and also reflects the manufacturing process of the entire instrument. Therefore, the sample recovery rate is an important indicator for evaluating the quality of the equipment.
6. How to verify the accuracy of the test results of the azotometer?
Answer: The standard sample with known sample content can be used for calibration. Generally, the prepared ammonium sulfate is used for calibration of the instrument.
7. Can other color indicators be used in the azotometer?
Answer: If manual titration is used, other color indicators can be selected. If the fully automatic instrument is used, the color indicator shall be prepared according to the proportion specified by the product, and other reagents shall not be replaced. The builtin color change process of the product has been adjusted to the best state when leaving the factory, which ensures the accuracy of the results.
8. Can the azotometer be equipped with digestive tubes of different specifications and manufacturers?
Answer: No. Each manufacturer has a standard size and specification for the digestive tube. The size is not the same as the matching of the machine, so it is recommended to configure the digestive tube produced by the original factory.
9. Can the azotometer do other distillation experiments besides measuring the nitrogen content in the sample?
Answer: Theoretically, it is possible. It depends on different experiments and different needs of the experiment.
10. How to verify the accuracy of the test results of the azotometer?
Answer: The standard sample with known sample content can be used for calibration. Generally, the prepared ammonium sulfate is used for calibration of the instrument.
11. What are the special requirements of the azotometer for the laboratory environment?
Answer: 1, must ensure normal laboratory power supply. 2. Ensure smooth water supply and drainage in the laboratory. 3. The instrument shall be placed no more than 1.5m away from the tap water source. 4. According to the national mandatory regulations, all digestion experiments must be carried out in a ventilated place.
12. Does the Kjeldahl nitrogen determination experiment need other instruments?
Answer: Yes, mainly balances, drying ovens, mortars, and basic experimental glass instruments with related reagents.
13. How long is the service life of the azotometer?
Answer: The designed service life of the azotometer is 10 years, depending on the amount of experiments and daily maintenance.
14. Boric acid absorption solution sometimes has bubbles when it is absorbed. Will it affect the results?
Answer: No, because in the process of condensation, air will follow the ammonia into the absorption liquid to produce bubbles, which is a normal phenomenon and has no effect on the experimental results.
15. What are the wearing parts and consumables of the nitrogen analyzer?
Answer: The vulnerable part of the nitrogen determinator is mainly the digestive tube. Because it is a glass product, it is inevitable that there will be collisions and scratches during daily use. It is recommended to equip more digestive tubes. The consumables of the product are mainly reagents used in daily experiments, mainly copper sulfate (catalyst), potassium sulfate (to increase the boiling point of sulfuric acid), concentrated sulfuric acid, boric acid, sodium hydroxide, hydrochloric acid, etc.
16. Can the nitrogen determination instrument be used with digestion instruments of different brands?
Answer: For other brands of digestion instrument, it is necessary to determine whether the digestive aperture of the digestion instrument is consistent with that of the supporting manufacturer. In order to ensure the accuracy and efficiency of the entire experimental results, it is recommended to purchase the original digestion instrument.
17. How to ensure the service life of Kjeldahl azotometer?
Answer: The service life of the azotometer depends on the raw materials, processing technology and aftersales service used by different manufacturers. Because the Kjeldahl experiment involves many factors such as strong acid, strong alkali, high temperature and so on, the daily maintenance and maintenance of the instrument is also an important factor to determine the service life of the instrument.
18. Does the azotometer need to be identified by the quality inspection department?
Answer: The azotometer is not included in the national compulsory verification catalogue and is not a measuring instrument, so it does not need the verification of the quality inspection department.