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Title of article :
Trace element determination using static high-sensitivity inductively coupled plasma optical emission spectrometry (SHIP-OES) Original Research Article
Author/Authors :
Carsten Engelhard، نويسنده , , Andy Scheffer، نويسنده , , Sascha Nowak، نويسنده , , Torsten Vielhaber، نويسنده , , Wolfgang Buscher، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
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Abstract :
A low-flow air-cooled inductively coupled plasma (ICP) design for optical emission spectrometry (OES) with axial plasma viewing is described and an evaluation of its analytical capabilities in trace element determinations is presented. Main advantage is a total argon consumption of 0.6 L min−1 in contrast to 15 L min−1 using conventional ICP sources. The torch was evaluated in trace element determinations and studied in direct comparison with a conventional torch under the same conditions with the same OES system, ultrasonic nebulization (USN) and single-element optimization. A variety of parameters (x–y-position of the torch, rf power, external air cooling, gas flow rates and USN operation parameters) was optimized to achieve limits of detection (LOD) which are competitive to those of a conventional plasma source. Ionic to atomic line intensity ratios for magnesium were studied at different radio frequency (rf) power conditions and different sample carrier gas flows to characterize the robustness of the excitation source. A linear dynamic range of three to five orders of magnitude was determined under compromise conditions in multi-element mode. The accuracy of the system was investigated by the determination of Co, Cr, Mn, Zn in two certified reference materials (CRM): CRM 075c (Copper with added impurities), and CRM 281 (Trace elements in rye grass). With standard addition values of 2.44 ± 0.04 and 3.19 ± 0.21 μg g−1 for Co and Mn in the CRM 075c and 2.32 ± 0.09, 81.8 ± 0.4, 32.2 ± 3.9 for Cr, Mn and Zn, respectively, were determined in the samples and found to be in good agreement with the reported values; recovery rates in the 98–108% range were obtained. No influence on the analysis by the matrix load in the sample was observed.
Keywords :
Inductively coupled plasma , Low-flow torch , Certified reference material , Optical emission spectrometry , Trace element determination , Static high-sensitivity ICP
Journal title :
Analytica Chimica Acta
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