Classification and application of Kjeldahl Nitrogen Analyzer

I. Classification of Nitrogen Determination Instrument

Nitrogen Determination Instrument is a kind of experimental equipment used to determine the nitrogen content in substances, which is widely used in many fields such as chemistry, biology, agriculture, food and so on. According to different working principles and application scenarios, Nitrogen Determination Instrument can be divided into various types.

1. Kjeldahl Nitrogen Determination Instrument:

Kjeldahl Nitrogen Determination Instrument is the classical method of nitrogen determination, based on the principle of Kjeldahl reaction (Kjeldahl method). It calculates the nitrogen content in the sample by converting the organic nitrogen in the sample into ammoniacal nitrogen, then absorbing the ammonia with acid to form an ammonium salt, and finally determining the ammonium salt content by standard acid titration. Kjeldahl Nitrogen Determination Instrument has the characteristics of easy operation, accurate and reliable results, but the analysis cycle is long, and the process of using sulfuric acid, strong alkali and other reagents are easy to cause pollution to the environment.

2. Dumas Nitrogen Determination Instrument:

Dumas Nitrogen Determination Instrument uses high temperature combustion method (Dumas method) to determine the nitrogen content in the sample. The sample is burned at high temperature in the oxygen environment, in which the organic nitrogen is converted into nitrogen, and then the nitrogen content is detected by gas chromatography and other techniques, so as to calculate the nitrogen content in the sample. Dumas Nitrogen Determination is fast in analysing and is environmentally friendly as it does not require the use of toxic and hazardous reagents. However, the cost of equipment is high, and the requirements for sample pretreatment are high.

3.  Ultraviolet spectrophotometric nitrogen analyser:

UV spectrophotometric nitrogen analyzer is based on ultraviolet spectral analysis technology of nitrogen determination. The nitrogen in the sample reacts with specific reagents to generate coloured compounds, and the nitrogen content in the sample can be calculated by measuring the ultraviolet absorbance of the compound. This type of nitrogen analyzer is simple to operate and fast to analyse, but it may be interfered by other substances in the sample, affecting the accuracy of the results.
4. Automatic Nitrogen Determination Instrument:
Automatic nitrogen detector combines the advantages of various nitrogen determination techniques to achieve automated and intelligent nitrogen content determination. Through computer control, it automatically completes the steps of sample weighing, sample addition, reaction and detection, which greatly improves the analysis efficiency. At the same time, the automatic nitrogen analyzer also has the functions of data storage, printing report, etc., which is convenient for users to carry out data management and result analysis.

II. Application of Nitrogen Determination Instrument

Nitrogen detector has a wide range of applications in many fields, the following are its main application areas:

1. Food safety testing: Nitrogen Determination Instrument can be used for the determination of protein content in food. Through the determination of nitrogen content in food, protein content can be calculated indirectly, providing an important reference for food safety testing. In addition, the nitrogen analyzer can also be used to detect additives in food, pesticide residues and other harmful substances, to ensure food safety.

2. Agricultural research: In agricultural research, the nitrogen meter can be used to determine the nitrogen content in soil and plant tissues. By understanding the nitrogen nutritional status of soil and plants, it can provide scientific basis for crop fertilisation and promote the growth and development of crops.

3. chemical production: in the chemical production process, the nitrogen meter can be used to determine the nitrogen content of raw materials and products. Through real-time monitoring of nitrogen content changes in the production process, production parameters can be adjusted in a timely manner to ensure product quality and production efficiency.

4. Environmental monitoring: nitrogen analyzer can be used for water quality, air and other environmental samples in the determination of nitrogen content. By understanding the nitrogen content changes in environmental samples, it can assess the environmental pollution status and provide data support for environmental monitoring and governance.

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