Do you know the importance of argon gas purifier for direct reading spectrometer?

Why use argon gas purifier for direct reading spectrometer? Do you know the importance of argon gas purifier for direct reading spectrometer?

The main technical indicators and technical keys of the direct-reading spectrometer include detection limit, sensitivity, analysis accuracy, measurement stability, calibration method, etc.

The main function of direct-reading spectrometer blowing argon is to drive off the air in the spark chamber when the sample is excited, and reduce the absorption of the air in the ultraviolet region. The main reason is that oxygen and water vapor in the air have a strong absorption band in the far ultraviolet region, which has a great impact on the analysis results, and is not conducive to the stability of excitation, forming or strengthening diffusion discharge, and white spots are generated during excitation. In addition, the alloying elements in the sample may chemically react with the components in the air to form molecular compounds at high temperatures, which will cause the analysis spectrum to interfere with the atomic spectrum we need. Therefore, the purity of argon must be 99.999%

The purity of argon used by the spectrometer is required to be ≥99.999%, and argon with insufficient purity will cause the following consequences:

1. The correction coefficient is out of the required range, and the standardization coefficient is too high.

2. The excitation light source does not excite and trips.

3. Diffusion discharge during excitation, the excitation point is white (white dot), the intensity is reduced, the sample surface is not corroded, and the analysis data is inaccurate.

4. The analysis data is unstable, especially the elements with lower wavelengths such as C, P, S, etc., as well as some high-alloy castings, cast aluminum, cast iron, pure metals, etc.

If the above problems occur, no matter how good the spectrometer is, it will not be able to analyze an accurate data. Therefore, if you want a spectrometer to analyze accurate data, the premise is to provide a good source of argon for the spectrometer, that is, argon with a content of ≥99.999%.

However, in reality, most of the argon manufacturers themselves do not have such high-purity testing equipment. Based on experience, the argon plants are not at the same level. The argon marked as 5 9s may not be able to reach it in actual use. It can only be analyzed whether the purity of argon is sufficient by the various characteristic phenomena of the detection process.

The content of argon output through the argon gas purifier is ≥99.9999%, which is much higher than the argon supply requirement of the spectrum.