Abstract
Electron density and ionization temperatures were measured for inductively coupled argon plasma at atmospheric pressure. Different sample introduction systems were investigated. Samples containing Sn, Hg, Mg, and Fe and acidified with hydrochloric or acetic acids were introduced into plasma in the form of aerosol, gaseous mixture produced in the reaction of these solutions with NaBH4 and the mixture of the aerosol and chemically generated gases. The electron densities measured from Hα, Hβ, Hγ, and Hδ lines on the base of Stark broadening were compared. The study of the H Balmer series line profiles showed that the ne values from Hγ and Hδ were well consistent with those obtained from Hβ which was considered as a common standard line for spectroscopic measurement of electron density. The ne values varied from 0.56·1015 to 1.32·1015 cm−3 and were the highest at loading mixture of chemically generated gases. The ionization temperatures of plasma, determined on the base of the Saha approach from ion-to-atom line intensity ratios, were lower for Sn and Hg (6500–7200 K) than those from Fe and Mg lines (7000–7800 K). The Sn II/Sn I and Hg II/Hg I, Fe II/Fe I, and Mg II/Mg I intensity ratios and the electron densities (ne) were dependent on experimental conditions of plasma generation. Experimental and theoretically calculated ionization degrees were compared.
Highlights
Coupled plasma (ICP) generated at atmospheric pressure has been recognized as a one of the most commonly applied techniques for both analytical purposes and spectrochemical investigations, including diagnostic studies
Spectroscopic investigations of the most prominent hydrogen lines belonging to the Balmer series in point of view their application for determination of electron density in Ar-Inductively coupled plasma (ICP) were carried out
The ne values obtained from the Hγ and Hδ line were in a very good agreement with those from the Hβ line at the all experimental conditions, while ne from the Hα line was significantly higher
Summary
Coupled plasma (ICP) generated at atmospheric pressure has been recognized as a one of the most commonly applied techniques for both analytical purposes and spectrochemical investigations, including diagnostic studies. It has become attractive for simultaneous determination of several elements in a great variety of samples, namely, environmental, industrial, geological, biological, clinical, and food materials [1,2,3]. That is, allowing the simultaneous introduction of volatile species and sample aerosol using pneumatic nebulization, can be used to determine both hydride and nonhydride elements [3, 11,12,13]
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