Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 65, Issue 4, Pages 272-278Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2010.02.002
Keywords
Atmospheric pressure; Capacitively coupled plasma; Emission spectroscopy; Physical characteristics; Analytical testing
Categories
Funding
- National University Research Council, Ministry of Education, Research and Innovation, Romania [446/2009, ID_2270]
Ask authors/readers for more resources
A very low power radiofrequency capacitively coupled plasma (13.56 MHz, 5-70 W), was generated in our laboratory on a sharp Kanthal tip without any counter electrode, as an intrinsic part of RLC series resonant circuit. Physical characteristics of this plasma obtained in Ar-He mixture, were studied as function of observation height or gas mixture composition. The excitation temperature of Ar (1500-2100 K), He (3000-3500 K) and H (2500-3200 K), the rotational temperature of the OH band (1300-2900 K), the electron temperature (5500-6500 K) and the electron number density (8 . 10(13)-2 . 10(14) cm(-3)) were determined. The evolution of several atomic emission lines or molecular bands was studied in order to investigate the fundamental processes that take place in such plasma. From the point of view of analytical applications it was found that the optimum conditions of excitation (most intense emission lines and lowest detection limits) are met for a 42% He in the gas mixture and an observation height of 1 mm above the electrode. The optimum atomic emission analysis parameters were established for 7 elements (Na, Li, Ca, K. Cd, Zn and Hg) using pneumatically nebulized liquid solutions. It was found that the presence of He in the plasmogenic gas has an enhancing effect on the emission intensities and detection limits. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available