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Online preconcentration ICP-MS analysis of rare earth elements in seawater

Online preconcentration ICP-MS analysis of rare earth elements in seawater
Online preconcentration ICP-MS analysis of rare earth elements in seawater
The rare earth elements (REEs) with their systematically varying properties are powerful tracers of continental inputs, particle scavenging intensity and the oxidation state of seawater. However, their generally low (?pmol/kg) concentrations in seawater and fractionation potential during chemical treatment makes them difficult to measure. Here we report a technique using an automated preconcentration system, which efficiently separates seawater matrix elements and elutes the preconcentrated sample directly into the spray chamber of an ICP-MS instrument. The commercially available “seaFAST” system (Elemental Scientific Inc.) makes use of a resin with ethylenediaminetriacetic acid and iminodiacetic acid functional groups to preconcentrate REEs and other metals while anions and alkali and alkaline earth cations are washed out. Repeated measurements of seawater from 2000 m water depth in the Southern Ocean allows the external precision (2?) of the technique to be estimated at <23% for all REEs and <15% for most. Comparison of Nd concentrations with isotope dilution measurements for 69 samples demonstrates that the two techniques generally agree within 15%. Accuracy was found to be good for all REEs by using a five point standard addition analysis of one sample and comparing measurements of mine water reference materials diluted with a NaCl matrix with recommended values in the literature. This makes the online preconcentration ICP-MS technique advantageous for the minimal sample preparation required and the relatively small sample volume consumed (7 mL) thus enabling large data sets for the REEs in seawater to be rapidly acquired.
1525-2027
Q01020
Hathorne, Ed C.
e171d49c-e8ce-47d1-a316-8924886afef0
Haley, Brian
edc3444f-978a-465e-ae7e-18276b3d601c
Stichel, Torben
c04e16ca-782d-47af-b955-7bbdd9e7f91d
Grasse, Patricia
e4c6d063-887e-4151-9dd0-1be9e2cdd9c7
Zieringer, Moritz
fc933a8a-9930-4201-8fd4-635c1392e464
Frank, Martin
09ec65ac-f62d-41da-86b2-81908973b8a1
Hathorne, Ed C.
e171d49c-e8ce-47d1-a316-8924886afef0
Haley, Brian
edc3444f-978a-465e-ae7e-18276b3d601c
Stichel, Torben
c04e16ca-782d-47af-b955-7bbdd9e7f91d
Grasse, Patricia
e4c6d063-887e-4151-9dd0-1be9e2cdd9c7
Zieringer, Moritz
fc933a8a-9930-4201-8fd4-635c1392e464
Frank, Martin
09ec65ac-f62d-41da-86b2-81908973b8a1

Hathorne, Ed C., Haley, Brian, Stichel, Torben, Grasse, Patricia, Zieringer, Moritz and Frank, Martin (2012) Online preconcentration ICP-MS analysis of rare earth elements in seawater. Geochemistry, Geophysics, Geosystems, 13 (1), Q01020. (doi:10.1029/2011GC003907).

Record type: Article

Abstract

The rare earth elements (REEs) with their systematically varying properties are powerful tracers of continental inputs, particle scavenging intensity and the oxidation state of seawater. However, their generally low (?pmol/kg) concentrations in seawater and fractionation potential during chemical treatment makes them difficult to measure. Here we report a technique using an automated preconcentration system, which efficiently separates seawater matrix elements and elutes the preconcentrated sample directly into the spray chamber of an ICP-MS instrument. The commercially available “seaFAST” system (Elemental Scientific Inc.) makes use of a resin with ethylenediaminetriacetic acid and iminodiacetic acid functional groups to preconcentrate REEs and other metals while anions and alkali and alkaline earth cations are washed out. Repeated measurements of seawater from 2000 m water depth in the Southern Ocean allows the external precision (2?) of the technique to be estimated at <23% for all REEs and <15% for most. Comparison of Nd concentrations with isotope dilution measurements for 69 samples demonstrates that the two techniques generally agree within 15%. Accuracy was found to be good for all REEs by using a five point standard addition analysis of one sample and comparing measurements of mine water reference materials diluted with a NaCl matrix with recommended values in the literature. This makes the online preconcentration ICP-MS technique advantageous for the minimal sample preparation required and the relatively small sample volume consumed (7 mL) thus enabling large data sets for the REEs in seawater to be rapidly acquired.

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Published date: 31 January 2012
Organisations: Geochemistry

Identifiers

Local EPrints ID: 368790
URI: http://eprints.soton.ac.uk/id/eprint/368790
ISSN: 1525-2027
PURE UUID: 488e97fa-1760-4708-b4cd-048bde9b24d0

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Date deposited: 16 Sep 2014 10:19
Last modified: 16 Dec 2019 20:23

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