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Spatial Emission Profiles for Flagging Matrix Interferences in Axial-Viewing Inductively Coupled Plasma-Atomic Emission Spectrometry: Part I - Profile Characteristics and Flagging Efficiency.
MedLine Citation:
PMID:  23013258     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Spatially resolved measurements of analyte emission along the cross-sectional axis of an axially viewed inductively coupled plasma (ICP) are utilized to indicate the presence of any of the three major categories of matrix interferences (i.e., plasma-related, sample-introduction-related, and spectral interferences). Barium at concentrations of 0.05 M or 0.1 M was chosen as a prototype element for plasma-related matrix effects whereas common mineral acids (nitric, hydrochloric, sulfuric and phosphoric) at volumetric concentrations from 1% to 20% were used to simulate sample-introduction related matrix effects. Three spectrally interfering line pairs (As and Cd at 228.81 nm, Er and Co at 239.73 nm, and Er and Ce at 302.27 nm) were selected for the study of spectral interferences. Depending on the nature of the interference, the analytical bias at the center of the cross-sectional profile varied between -40% to +50%. In all matrix-interference categories, because plasma characteristics and excitation conditions are heterogeneous along this cross-sectional axis, matrix-induced shifts in analyte emission vary accordingly. As a result, the determined concentrations of an analyte along the cross-sectional plasma axis are not constant but exhibit a position dependence that allows the interference to be flagged. With the exception of spectral interference from emission lines whose total excitation potentials (i.e., the sum of ionization and excitation energies of an ionic emission line) are very close, the spatially resolved concentrations provide an effective indicator for flagging any other matrix interference in axial-viewing ICP-emission spectrometry. The method can be employed under plasma forward power and carrier-gas flow conditions that are common for robust plasma operation.
Authors:
George C Chan; Gary Martin Hieftje
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-27
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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