Use of a capacitively coupled microwave plasma (CMP) with Ar, N2 and air as working gases for atomic spectrometric elemental determinations in aqueous solutions and oils |
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Authors: | M Seelig N H Bings and J A C Broekaert |
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Institution: | (1) University of Dortmund, Department of Chemistry, D-44221 Dortmund, Germany, DE |
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Abstract: | A comparative study was performed of 600 W capacitively coupled microwave plasmas (CMP) with different plasma gases (Ar,
N2 and air) and aerosol generation with the aid of a Légère pneumatic nebulizer. Detection limits with the different working
gases are in the order of 15–4000 ng/mL for Fe, Cr, Zn, Mg and Ca in aqueous solutions. The influence of organic solutions
on the stability of the plasma is discussed. The determination of Co, Cr, Fe, Mg and Ni in different oil samples by OES is
described, using an air-CMP and pneumatic nebulization after dilution of the oils by 20% with cyclohexane. The detection limits
for these elements are in the 100–400 ng/g range. Results obtained for a waste motor oil for the elements mentioned in the
concentration range of 4–50 μg/g were found to be in good agreement with those obtained by ICP-OES after digestion of the
oils at high pressure in PTFE vessels.
Received: 10 March 1997 / Revised: 23 May 1997 / Accepted: 30 May 1997 |
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