Is It Necessary to Use Argon Purifier for Measuring Nodular Iron by Direct Reading Spectrometer?

Do you know that the argon purifier must be used to measure ductile iron by direct reading spectrometer? I believe that most people are not very clear, the following small series for everyone to explain it!

(1) The spectrometer is a qualitative analysis by analyzing whether the characteristic spectra of various elements appear; By analyzing the intensity of the spectral line, the content of the element is determined. As far as cast iron is concerned, the characteristic spectral lines of the main elements are outside the ultraviolet, and the absorption rate in the air is particularly high in this wavelength range, so it is necessary to use argon to protect the excitation platform, and the purity of argon is very high.

(2) Whether it is ductile iron or gray iron, as long as the spectrum of the measured elements is in the ultraviolet region, the requirements for the light chamber are very high. Vacuum or argon is generally required. It is mainly to prevent oxygen and water vapor in the air from absorbing the ultraviolet spectrum and affecting the measurement stability. Therefore, the purer the argon, the better, the bottled argon purity is not stable enough, so it is necessary to connect an argon purifier (argon purifier).

3, because the hardness of ductile iron itself is very high, it is difficult to be excited by the instrument, the higher the purity of argon, the better the excitation point, the more accurate the measurement. This problem is not only used in the measurement of iron balls, but also in the measurement of pure argon. The spectrometer is a high-voltage breakdown of argon in an argon environment, forming a channel, ionizing the metal, which is greatly affected by the purity of argon, no matter which instrument is the same, the requirements for argon are relatively high, easy to use liquid argon or high-purity argon, purity is generally more than 5 9. Otherwise, the data generated will not be ideal.