Techniques for analytical chemistry products

The techniques for analytical chemistry products mainly include the following aspects:
Choose the appropriate analysis method:
Chemical analysis: including weight analysis and volumetric analysis. Weight analysis calculates the chemical composition of a sample by measuring the mass of the generated product; Capacity analysis determines the content of components by measuring the volume of standard reagents consumed in the reaction.
Spectral analysis: such as infrared spectroscopy, ultraviolet spectroscopy, nuclear magnetic resonance spectroscopy, and mass spectrometry. These methods utilize the absorption, emission, or ionization characteristics of the sample to analyze its composition and structure.
Chromatography: including gas chromatography and high-performance liquid chromatography. Gas chromatography is suitable for volatile compounds, while high-performance liquid chromatography is suitable for non-volatile or thermally unstable compounds.
Sample processing and pre-processing techniques:
Extraction and Purification: For complex samples, appropriate extraction and purification steps are required to ensure that the target compound can be effectively separated and detected.
Derivatives: In some cases, derivatization can improve the detection performance of compounds, such as increasing their volatility or stability.
The application of modern instrument analysis technology:
Nuclear Magnetic Resonance (NMR): Used to determine the structure and chemical environment of molecules.
Mass spectrometry (MS): Identification and quantification of compounds by ionizing samples and measuring the mass of ions.
Infrared spectroscopy (IR) and ultraviolet spectroscopy (UV) are used to determine chemical bonds and electronic structure information in molecules, respectively.
Gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS): Combining the separation ability of chromatography and the identification ability of mass spectrometry, they provide high-precision qualitative and quantitative analysis.
Data processing and result interpretation:
Standard comparison: Use standard samples for comparison to determine the structure and content of unknown compounds.
Database query: Using databases of mass spectrometry and other instruments, identify compounds by comparing standard spectra.
Multi method combination: Select multiple methods to be used in combination according to specific needs to improve the accuracy and comprehensiveness of analysis.