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Microanalysis can be generally divided into micro-qualitative analysis and micro-quantitative analysis. Qualitative analysis often uses sensitive methods such as micro-crystallization reaction, and quantitative analysis of commonly used analytical methods such as weight, capacity and instrument. There are also semi-micro analysis and ultra-micro analysis in the analysis classification with different sample weights.
Quantitative analysis HPLC vials
Drip reaction analysis
The device used in the spot reaction analysis method is simple and easy to operate, and can be used as a pre-test means or for on-site analysis. [4]
Microcrystallization analysis
The reaction applied in the qualitative analysis of microcrystals finally yields a poorly soluble compound having a certain crystal shape. When observing the special shape, color and size of the crystal with a microscope, it is possible to quickly conclude any ions present in the analysis solution.
The molecular weight of the poorly soluble compound formed is desirably as large as possible when applying a qualitative microcrystallization reaction. When a metal is precipitated in the form of such a compound, the larger the molecular weight, the higher the reaction sensitivity. The more sensitive the reaction, the smaller the concentration limit of the solution that may be required to detect an ion.
Due to the high sensitivity of the microcrystallization reaction, and the application of the microscopy can be carried out without careful separation of the existing hands. In most cases, a small amount of other substances present at the same time does not interfere with the crystal shape formed by an unknown compound observed by a microscope. [5] HPLC vials
Micro quantitative analysis
Micro-quantitative analysis commonly used analytical methods such as weight, capacity and instrument.
Gravimetric method
The measured components in the test sample are separated by different methods, and the weight is weighed to calculate the content. According to the separation method, the gravimetric analysis is divided into a sediment weight method, a volatile weight method, and an extraction weight method. The gravimetric method determines the content of certain inorganic and organic compounds. In the drug purity test, the gravimetric method is often used for the measurement of dry weight loss, ignition residue, ash and non-volatile matter.
Micro and ultra-micro analysis editing
The main difference between micro, ultra-micro and constant analysis is the difference in sampling. Generally, the sample is 0.01 to 0.001 gram for micro analysis, and less than 0.001 gram for ultra-micro analysis. Because of the small number of samples, the analysis operation is also very different from the constant analysis. For example, the solubility of the precipitate, the error of the indicator, etc. have negligible influence on the constant analysis, and cause a large error in the micro and ultra-micro analysis. In particular, ultra-micro analysis requires more stringent conditions, taking into account the evaporation of the solution itself in the air, so the titration must be carried out in humid air. HPLC vials
Generally, the vessels for microanalysis are very small, and have various shapes depending on the requirements. Various instrumental analysis methods can be directly applied to microanalysis after appropriate improvement.
Ultra-micro analysis Because there are too few samples, all analytical operations (such as precipitation and deuteration) must be performed under the microscope, and some instrumental analysis (such as potentiometric titration, electrolysis and conductance) can also be used as ultra-micro analysis. use.
This is the end of the introduction of Microanalysis classification. I hope it can help you.
