Technical seminar: the difference between chemical analysis and instrumental analysis

Chemical analysis refers to a type of analysis method that uses the chemical reaction and its quantitative relationship to determine the composition and content of the measured substance. Chemical reagents, balances and some glassware are required for the determination.

Instrument analysis (modern analysis method or physical analysis method): It is an analysis 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 more complicated or special instruments and equipment, so it is called "instrument analysis". In addition to qualitative and quantitative analysis, instrumental analysis can also be used for structure, valence state, state analysis, micro-area and thin layer analysis, trace and ultra-trace analysis, etc., is the direction of development of analytical chemistry.

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

1. Level L or even lower. It is suitable for the determination of trace, trace and ultra-trace components. High sensitivity, the detection limit can be reduced. If the amount of sample is reduced from the mL and mg levels of chemical analysis to the one analyzed by the instrument

2. Good selectivity. Many instrumental analysis methods can select or adjust the measurement conditions so that the coexisting components are determined without interfering with each other.

3. Simple operation, fast analysis speed and easy automation.

4. The relative error is large. Chemical analysis can generally be used for constant and high-content composition analysis with high accuracy and an error of less than a few thousandths. The relative error of most instrument analysis is relatively large, generally 5%, which is not suitable for the analysis of constant and high content components.

5. Instrument analysis requires a relatively expensive special instrument medical education | Yu network collection.

The two are similar:

1. Both can be used as qualitative and quantitative analysis methods. Chemical analysis can generally be used for constant and high-content composition analysis with high accuracy and an error of less than a few thousandths. The relative error of most instrument analysis is relatively large, generally 5%, which is not suitable for the analysis of constant and high content components.

2. The analysis principle is consistent.

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