In general, the nitrogen analyzer is commonly used Kjeldahl and Dumas determination of nitrogen, although they belong to the nitrogen determination products, but their principles are completely different, including Kjeldahl The principle is the Kjeldahl method, and the principle of the Dumas determinator is the Dumas combustion method. Here is the difference between the two methods.
The Kjeldahl nitrogen analyzer follows the basic principle of the Kjeldahl method. Since the protein is a nitrogen-containing organic compound, this method heats the food together with the sulfuric acid and the catalyst to decompose the protein, and the decomposed ammonia is combined with the sulfuric acid. Ammonium sulfate. Alkalinity distillation is then used to liberate ammonia, which is then absorbed by boric acid and then titrated with a sulfuric acid or hydrochloric acid standard solution. The protein content is obtained by multiplying the acid consumption by the conversion factor. The method of Dumas combustion is to encapsulate a certain amount of sample in an aluminum boat and then burn it in a high-temperature furnace; in the catalyst and oxygen environment, the gas generated after the sample is burned is: CO2, H2O, NOx; these After the gas passes through the reduction furnace, NOx is reduced to N2, and CO2 and H2O are separated; finally, the nitrogen is measured by the thermal conductivity detector (TCD).
At present, the widest range of applications and widely adopted by industry personnel is the Kjeldahl method. Therefore, the Kjeldahl nitrogen analyzer products based on this principle are also very numerous and have been developed to a higher degree of automation. , Semi-automatic Kjeldahl nitrogen analyzer and automatic Kjeldahl nitrogen analyzer, the instrument has a fast analysis, a wide range of applications, fewer samples required, equipment and operation is relatively simple, unique security features allow users to The process of operation is safer and more secure. Therefore, the Kjeldahl instrument has become the instrument of choice for the determination of protein content in samples and is widely used in the determination of soil, food, agricultural products, feedstuffs and other nitrogenous compounds.
Steel-drawer
Model:XY-P80 XY-p120
Specification:
The Steel-drawer pull out the whole bar, the sidewall because of the role of the pull mouth,promoting rubber tearing, smoothly separate wire and rubber.
Advantages:
1.This equipment adopts double vane pump to supply oil, low working noise, at the same time to ensure the speed and pressure of the drawing cylinder when working, and improve the working efficiency and the service life of the valve.
2.The automatic lifting device is adopted to reduce the labor intensity of workers;
3.The inner guide rail positioning, make sensor reliability retractor positioning highly accuracy, drawing cylinder operation smoothly.
4.Using manual automatic exchange of work,flexible choice.
Tyre Steel Remover ,Tyre Horizontal Steel Drawer,Tyre Steel Lateral Drawer
Shangqiu Jinpeng Industrial Co., Ltd. , https://www.recyclings.nl