Flow injection on-line reductive precipitation preconcentration with magnetic collection for electrothermal atomic absorption spectrometry

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DOIResolve DOI: http://doi.org/10.1039/a702608k
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TypeArticle
Journal titleJournal of Analytical Atomic Spectrometry
ISSN0267-9477
Volume12
Issue11
Pages12811285; # of pages: 5
AbstractA flow injection on-line preconcentration system coupled to an electrothermal atomic absorption spectrometer for the determination of trace metals in saline media is described. The filterless, magnetic collection of coprecipitated analytes is based on the tetrahydroborate reductive precipitation of added iron and palladium in alkaline medium at a sample flow rate of 1.7 ml min–1. The precipitate is dissolved in a 20 µl volume of mixed acid and transported direct to the graphite furnace. With the exception of Cr (33% recovery in seawater), recoveries of Ag, As, Bi, Cd, Co, Cu, Mn, Ni, Pb, Sb and Tl averaged 84% from deionized water and 67% from coastal seawater with a frequency of 12 measurements h–1. The sensitivity of the graphite furnace technique can be enhanced over 400-fold (for an 11 ml sample volume) compared to a standard 20 µl injection volume. Detection limits in the low pg (absolute) or pg ml–1 (relative) range can be reached. Results, presented for the determination of As, Cd, Cr, Cu, Mn and Ni in 1 ml volumes of CASS-3 NRCC Certified Reference Material seawater, are not statistically different (t-test, 95% confidence limit) from the certified values for these elements.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedNo
Identifier10391186
NRC number1248
NPARC number5764979
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Record identifier0b31cd7d-f741-4c3c-96f6-45413b02073a
Record created2009-03-29
Record modified2016-05-09
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