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Development and characterization of bottom-viewed inductively coupled plasma-atomic emission spectrometry.pdf
Spectrochimica Acta Part B 63 (2008) 861–867
Contents lists available at ScienceDirect
Spectrochimica Acta Part B
j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / s a b
Development and characterization of bottom-viewed inductively coupled plasma-atomic emission spectrometry ☆
Tim B.-L. Tse, Wing-Tat Chan ?
Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China
article info
Article history: Received 11 November 2007 Accepted 28 February 2008 Available online 13 March 2008
Keywords: Bottom-viewed inductively coupled plasma BV-ICP Axial viewing Radial viewing Hollow light pipe Aerosol–plasma interaction
abstract
In bottom-viewed inductively coupled plasma-atomic emission spectrometry (BV-ICP-AES), emission from the central channel of the plasma is measured axially from the bottom of the plasma. A straight quartz tube was used as a hollow light pipe (HLP) to collect plasma emission in this study. The HLP also serves as an injector for aerosols transport and injection into the ICP. The optical characteristics of HLPs with the original re?ective surface and roughened outer surface are reported. The roughened HLP is effective in rejecting light beams that are not in line with the HLP. The transmission ef?ciency of the HLP, however, is high (N 70%) for light beams from a source that has the same dimension as the entrance of the HLP and is ?ush with the HLP. The HLP is effective in rejecting background emission from the core of the plasma that encircles the plasma central channel and yet ef?cient in light collection from the central channel of the plasma. The effects of central channel gas ?ow rate on atomic and ionic emission intensity of Sr and Zn are reported. Maximum intensity corresponds approximately to the minimum central channel gas ?ow rate for effective aerosol injection into the plasma. The emission intensity pro?les also correlate with the thermal properties as well as excitation and ionization pot
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