Abstract
Nowadays, there is an increasing necessity to determine the concentration of different substances in the environment in low concentrations, as more and more attention is paid to environmental pollution. This work is devoted to the comparison of main characteristics of high-frequency electrodeless light sources with different fillings for their use in high precision atomic absorption analysers.The spectral line intensities and profiles were studied in special design light sources, manufactured at Institute of Atomic Physics and Spectroscopy, with arsenic, mercury and thallium filling. Special attention is devoted to the UV lines of 193.7 nm and 197.2 nm of As, 276.8 nm, 377.6 nm of Tl and 253.7 nm of Hg spectral lines. The intensities and profiles were measured by means of a Fourier transform spectrometer.The deconvolution procedure was implemented to obtain the real form of emitted profiles for further analysis, since in the case of low –pressure or cold plasma, the instrumental function is on the same order that experimental profile and it has to be taken into account. The instrumental function can distort the real spectral line shape significantly, for example, it changes the width of the spectral line that leads to the uncertainties in the determination of such important plasma parameters like temperature. The instrumental function can conceal a detailed structure of the spectral line, like the dip in the line center caused by the self-absorption (self-reversal) and characterizing the radiation trapping.The integrated areas, values of self-absorption, and other parameters were obtained and compared for all fillings as a function of working regimes.
Highlights
Since thallium, mercury, and arsenic exposure even at small doses can have adverse effects on humans and environment, their monitoring is of high importance
In this work we test in laboratory conditions highfrequency electrodeless lamps with arsenic, mercury and thallium fillings for their use in atomic absorption
high frequency electrodeless light sources (HFEDLs) filled with Tl were operated with excitation generator power values between 13.7 W and 22.8 W, for As lamps the range was from 4.7 W till 8.68 W and Hg lamps from 2.63 W till 9.05 W
Summary
Mercury, and arsenic exposure even at small doses can have adverse effects on humans and environment, their monitoring is of high importance. As with any highly toxic element, it is imperative to detect concentrations as low as possible. The spectral line shape studies are necessary, to find appropriate spectral line for the application of high frequency electrodeless light sources (HFEDLs) in atomic absorption spectrometry (AAS) for determination of environmental pollution, as well as to optimize the HFEDLs operation. The main requirements for use of the line in AAS are the narrow and intense spectral line without self-absorption [1]. In this work we test in laboratory conditions highfrequency electrodeless lamps with arsenic, mercury and thallium fillings for their use in atomic absorption. Natalja Zorina, et al Comparison of As, Hg and Tl High-Frequency Electrodeless Lamps for Detection of Environmental Pollution spectrometers for detection of arsenic, mercury and thallium in low concentrations in the environment
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