The difference and characteristics between chemical analysis and instrumental analysis

Chemical analysis refers to a type of analytical method that uses chemical reactions and their stoichiometric relationships to determine the composition and content of the substance being measured. Chemical reagents, scales, and some glassware are required for measurement.

Instrumental analysis (modern analytical method or physical analysis method): It is an analytical method established based on the physical or physicochemical properties of substances. This type of method usually measures physical quantities such as light, electricity, magnetism, sound, and heat to obtain analysis results, and measuring these physical quantities generally requires the use of complex or special instruments and equipment, hence it is called "instrument analysis". Instrumental analysis can be used not only for qualitative and quantitative analysis, but also for structural, valence state, state analysis, micro area and thin layer analysis, trace and ultra trace analysis, etc. It is the direction of development in analytical chemistry.

Compared to chemical analysis, instrumental analysis has the following characteristics:

1. L level, even lower. Suitable for the determination of trace, trace, and ultra trace components.? g、? High sensitivity, detection * can be reduced. If the sample dosage is reduced from mL and mg levels for chemical analysis to instrument analysis

2. Good selectivity. Many instrument analysis methods can select or adjust the measurement conditions to ensure that coexisting components do not interfere with each other when measured.

3. Easy to operate, fast analysis speed, and easy to achieve automation.

4. The relative error is relatively large. Chemical analysis can generally be used for constant and high content component analysis, with high accuracy and an error of less than a few thousandths. Most instrument analyses have relatively large errors, generally around 5%, and are not suitable for constant and high content component analysis.

5. Instrument analysis requires expensive instruments.

The similarities between the two are:

1. Both can be used as qualitative and quantitative analysis methods. Chemical analysis can generally be used for constant and high content component analysis, with high accuracy and an error of less than a few thousandths. Most instrument analyses have relatively large errors, generally around 5%, and are not suitable for constant and high content component analysis.

2. The analysis principle is consistent.
Related instruments and meters:Vortex MixerRotating shaker,Transfer shakerRotating cultivation mixer,Decolorization shakerMini centrifuge