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Reduction of Matrix Effects in Inductively Coupled Plasma Mass Spectrometry by Flow Injection with an Unshielded Torch

TitleReduction of Matrix Effects in Inductively Coupled Plasma Mass Spectrometry by Flow Injection with an Unshielded Torch
Publication TypeJournal Article
Year of Publication2009
AuthorsGross CT, McIntyre SM, Houk RS
Journal TitleAnalytical Chemistry
Volume81
Pages4898-4905
Date Published06/15
ISBN Number0003-2700
Accession NumberISI:000266969700029
Keywordsconcomitant elements, fluorescence, icp-ms, impurities, interferences, ion-source, preconcentration, seawater, trace-metals, water
Abstract

Solution samples with matrix concentrations above similar to 0.1% generally present difficulties for analysis by inductively coupled plasma mass spectrometry (ICP-MS) because of cone clogging and matrix effects. Flow injection (R) is coupled to ICP-MS to reduce deposition from samples such as 1% sodium salts (as NaCl) and seawater (similar to 3% dissolved salts). Surprisingly, matrix effects are also less severe during flow injection, at least for some matrix elements on the particular instrument used. Sodium chloride at 1% Na and undiluted seawater cause only 2 to 29% losses of signal for typical analyte elements. A heavy matrix element (Bi) at 0.1% also induces only similar to 14% loss of analyte signal. However, barium causes a much worse matrix effects that is, similar to 90% signal loss at 5000 ppm Na. Also, matrix effects during FI are much more severe when a grounded metal shield is inserted between the load coil and the torch, which is the most common mode of operation for the particular ICP-MS device used.
URL<Go to ISI>://000266969700029
DOI10.1021/Ac900568x