Plasma currently refers to ionized gas. Plasma is different from ordinary gas. It not only contains neutral atoms and molecules, but also contains a large number of electrons and ions, so it is a good conductor of electricity. Because the density of positive and negative charges is equal, it is electrically neutral as a whole, so it is called plasma. The plasma font often referred to in spectral analysis refers to gases with a higher degree of ionization, and the degree of ionization is about 0.1% or more. Ordinary chemical flames have a very low ionization degree and are generally no longer called plasma.
ICP is an instrument used to determine the chemical composition of substances, quantitatively analyze the content of substances, and is a method of solution injection. It is mainly used for the quantitative analysis of metallic elements and some non-metallic elements in liquid samples (including solid samples that can be converted into solutions by chemical treatment). The sample solution is introduced into the plasma torch in the form of aerosol. The sample is excited and emits light with the characteristic wavelength of the contained element. After the spectroscopic system is expanded, the intensity of the spectral line is received by the photoelectric device and converted into an electrical signal. is recorded. According to the relationship between the concentration of the measured element in the solution and the intensity of the spectrum, the content of each corresponding element in the sample is determined.
ICP is widely used in various fields of inorganic sample analysis and has become the most commonly used analytical tool in analytical laboratories. According to the similar analysis methods, there are roughly the following categories:
Steel and its alloys (carbon steel, cast steel, alloy steel, high-purity steel, high-purity iron, ferroalloy, etc.)
Non-ferrous metals and their alloys (non-ferrous metals and their alloys, rare metals and their alloys, precious metals, rare earth elements and their compounds)
Water quality samples and their compounds (drinking water, surface water, mineral water, high purity water and wastewater, sewage, etc.)
Environmental samples (soil, fly ash, atmospheric dust)
Geological and mineral samples (geological samples, ores and minerals)
Chemical chemical products (chemical reagents, chemical products, inorganic materials, cosmetics, oil products, etc.)
Animal, plant and biochemical samples (plants, Chinese medicine and animal tissues, biochemical samples)
Nuclear Industry Products Nuclear Fuel Nuclear Material
Food and beverage
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