Accurate, precise and direct determination of dissolved phosphate and silicate in seawater by IEC SF-ICPMS

Alternative titleDirect determination of dissolved phosphate and silicate in seawater by ion exclusion chromatography sector field inductively coupled plasma mass spectrometry
Download
  1. (PDF, 1 MB)
  2. Get@NRC: Accurate, precise and direct determination of dissolved phosphate and silicate in seawater by IEC SF-ICPMS (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/ac5002228
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleAnalytical Chemistry
ISSN1520-6882
Volume86
Issue6
Pages32223226; # of pages: 5
SubjectChromatography; Inductively coupled plasma mass spectrometry; Ion chromatography; Isotopes; Seawater; Silicates; Silicon; Analyte concentration; Certified reference materials; Dissolved phosphates; Ion exclusion chromatographies; Method detection limits; National Research Council; Polyatomic interferences; Sector field inductively coupled plasma mass spectrometries; Dissolution
AbstractA method is described for the direct determination of dissolved phosphate and silicate in seawater using ion exclusion chromatography (IEC) coupled with sector field inductively coupled plasma mass spectrometry (SF-ICPMS). Dissolved silicate was determined by double isotope dilution using a 29Si spike, whereas one point gravimetric standard addition with internal standard of the same 29Si spike was employed to quantitate dissolved phosphate. Medium resolution was used for all measurements in order to resolve polyatomic interferences on Si and P isotopes. Concentrations of 1.670 ± 0.008 and 30.20 ± 0.09 μM (SD, n = 6) with precisions of 0.47 and 0.31% for the dissolved phosphate and silicate, respectively, were obtained in National Research Council Canada certified reference material MOOS-3 seawater, in good agreement with certified values of 1.60 ± 0.15 and 30.5 ± 0.8 μM (U, k = 2), respectively. The reported method is a rapid (10 min per run), simple, and accurate online technique that requires no sample pretreatment. Moreover, this procedure achieves <0.5% precision (at above analyte concentrations) and method detection limits of 0.006 and 0.004 μM (0.18 as P and 0.11 ng g-1 as Si), respectively, using a of 100 μL injection of seawater. The proposed technique is robust and well-suited for the determination of dissolved phosphate and silicate in seawater. © Published 2014 by the American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards
Peer reviewedYes
NPARC number21272119
Export citationExport as RIS
Report a correctionReport a correction
Record identifiere6756eaf-b911-4380-950f-20c5eab4c66a
Record created2014-07-23
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)