The Importance of Argon Purifiers for Optical Emission Spectrometer

The main technical indicators and technical keys of the optical emission spectrometer include detection limit, sensitivity, analytical accuracy, stability of a measurement, and calibration method.

The main role of optical emission spectrometer blowing argon is the sample spark to drive away the air in the spark chamber, reducing the absorption of air on the spectral lines of the ultraviolet region. Mainly because the oxygen in the air, water vapour in the far-ultraviolet region has a strong absorption band, causing a great impact on the analysis results, and is not conducive to the sparking of the stability, the formation or enhancement of the diffusion discharge, the excitation produces a white spot. In addition, the alloying elements in the sample at high temperatures may be generated with the air component of the chemical reaction of molecular compounds, which will have the analysis of the spectrum of the atomic spectrum we need to cause interference. Therefore, the purity of argon gas must be required to reach 99.999%.

The purity of argon used in the spectrometer is required to be ≥99.999%, and its insufficient purity of argon will lead to the following consequences:

1. The calibration coefficient exceeds the required range, and the standardisation coefficient is high.

2. Excitation of the light source is not excited and trip.

3. Diffusion discharge during excitation, the excitation point is white (white point), intensity reduction, no erosion of the sample surface, inaccurate analysis data.

4. The analysis data is not stable, especially the analysis of lower wavelength elements such as: C, P, S, etc., as well as some high alloy castings, cast aluminium, cast iron, pure metal, etc..

If the above problems happen, even a good spectrometer will not be able to analyse an accurate data. Therefore, want the spectrometer to analyse an accurate data, the prerequisite is to provide a good source of argon to the spectrometer, that is, the content of ≥ 99.999% argon.

But the reality, because most of the argon manufacturers themselves do not detect such high purity equipment, all depending on experience, argon factory levels, marked as 5 9 argon, the actual use of argon, may not reach, we can only rely on our own detection process of the various characteristics of the phenomenon of argon analysis of the purity of sufficient.

And through the argon purification machine output argon content ≥ 99.9999%. Far higher than the spectrum of argon supply requirements.