Composite carbon source national standard testing standards analysis (II)

Detection method

According to different testing items, the testing methods of composite carbon sources are different. The following introduces several common detection methods:

1. Organic matter content: oxidative pyrolysis method, alkali - acid neutralisation titration method and other methods for determination.

2. Carbon and nitrogen ratio: Determination by combustion method, ignition volume method and other methods.

3. pH value: Adopt acid-base titration method, potentiometric titration method and other methods for determination.

4. granularity: sieving method, laser particle size analysis method and other methods for determination.  

5. Water content: drying method, mass ratio method, weight method and other methods for determination.

In addition to the above detection methods, there are other special detection methods, such as: harmful components detection can be determined by high performance liquid chromatography, gas chromatography, plasma mass spectrometry and other methods; microbiological detection can be determined by culture method, PCR technology and other methods.

Summary

The national testing standard of composite carbon source is an important measure to ensure the quality and safety of composite carbon source, in which chemical composition, physical properties, moisture, harmful components and microorganisms are the main testing items. The detection methods used for different testing items are also different, and need to be selected according to the specific situation. In the process of production, sales and use, the national standards must be met in order to ensure the quality and safety of composite carbon sources.