The purity determination generally refers to the determination of the purity of a high-purity substance (such as a high-purity metal, a high-purity material, a high-purity gas, etc.) by an appropriate analysis method. In many fields, for example, the manufacturing, substances are most efficient when they’re pure. In addition, the pursuit of a healthy living requires a purer environment, where purity determination is necessary to us. There are two methods for measuring purity:
Fig 1 Methods of purity determination
Spectrophotometry is a method of qualitatively and quantitatively analyzing a substance by measuring the absorbance of light at a specific wavelength or a certain wavelength range. It has the advantages of high sensitivity, easy operation and fast, and is the most commonly used experimental method in biochemical experiments. Many substances are measured by spectrophotometry. In a spectrophotometer, when the light of different wavelengths is continuously irradiated to a sample solution of a certain concentration, an absorption intensity corresponding to a different wavelength can be obtained.
The method of differential scanning calorimetry to determine the concentration of a substance has the advantages of simple operation, no need for a standard substance, and the purity can be obtained by appropriately processing the DSC curve of the substance as long as the substance purity reaches 98% or more. This method has been widely used in the purity identification of inorganic materials such as metals and alloys.
The mobile phase of gas chromatography is an inert gas, and a gas-solid chromatography method has a large surface area and a certain activity of an adsorbent as a stationary phase. When a multi-component mixed sample enters the column, the adsorption speed of each component in the column is different after a certain period of time due to the different adsorption capacity of the adsorbent for each component. In this way, the components are separated from each other in the column and sequentially detected and recorded in the detector.
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