Uncertainty contributions to the measurement of dissolved Co, Fe, Pb and v in seawater using flow injection with solid phase preconcentration and detection by collision/reaction cell - Quadrupole ICP-MS
Uncertainty contributions to the measurement of dissolved Co, Fe, Pb and v in seawater using flow injection with solid phase preconcentration and detection by collision/reaction cell - Quadrupole ICP-MS
A flow injection manifold incorporating a solid phase chelating resin (Toyopearl AF-Chelate-650) is reported for the preconcentration of dissolved metals from seawater, with a focus on investigating the effect of the loading pH, wash solution composition and wash time. Cobalt, iron, lead and vanadium have been used as target analytes with contrasting oceanographic behaviour. Quadrupole ICP-MS has been used for detection to make the approach accessible to most laboratories and a collision/reaction cell has been incorporated to minimise polyatomic interferences. Results for the seawater CRM NASS-6 and two GEOTRACES reference materials were in good agreement with the certified/consensus values, demonstrating the suitability of the approach for the determination of trace metals in seawater. The experimental design used allowed a thorough investigation of the uncertainty contribution from each method parameter to the overall expanded uncertainty of the measurement. The results showed that the parameters making the largest contributions were the precision of the peak area measurement and the uncertainty associated with the slope of the calibration curve. Therefore, these are the critical parameters that should be targeted in order to reduce the overall measurement uncertainty. For iron, the wash blank also gave a measureable contribution.
Flow injection, ICP-MS, Preconcentration, Quadrupole, Seawater, Trace metals
162-169
Clough, Robert
3cd2d6d7-3b64-4192-b021-a71441e6222a
Sela, Hagit
be676a22-30f9-4ac4-931d-c297ab9ff60a
Milne, Angela
39b44fbd-8f5e-40ea-80c9-244c20998020
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Tokalioglu, Serife
0cbd149b-ac5a-49e6-8475-7843ecf2c5ed
Worsfold, Paul J.
27675f89-7eee-45c5-821e-a381d8db9693
February 2015
Clough, Robert
3cd2d6d7-3b64-4192-b021-a71441e6222a
Sela, Hagit
be676a22-30f9-4ac4-931d-c297ab9ff60a
Milne, Angela
39b44fbd-8f5e-40ea-80c9-244c20998020
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Tokalioglu, Serife
0cbd149b-ac5a-49e6-8475-7843ecf2c5ed
Worsfold, Paul J.
27675f89-7eee-45c5-821e-a381d8db9693
Clough, Robert, Sela, Hagit, Milne, Angela, Lohan, Maeve C., Tokalioglu, Serife and Worsfold, Paul J.
(2015)
Uncertainty contributions to the measurement of dissolved Co, Fe, Pb and v in seawater using flow injection with solid phase preconcentration and detection by collision/reaction cell - Quadrupole ICP-MS.
Talanta, 133, .
(doi:10.1016/j.talanta.2014.08.045).
Abstract
A flow injection manifold incorporating a solid phase chelating resin (Toyopearl AF-Chelate-650) is reported for the preconcentration of dissolved metals from seawater, with a focus on investigating the effect of the loading pH, wash solution composition and wash time. Cobalt, iron, lead and vanadium have been used as target analytes with contrasting oceanographic behaviour. Quadrupole ICP-MS has been used for detection to make the approach accessible to most laboratories and a collision/reaction cell has been incorporated to minimise polyatomic interferences. Results for the seawater CRM NASS-6 and two GEOTRACES reference materials were in good agreement with the certified/consensus values, demonstrating the suitability of the approach for the determination of trace metals in seawater. The experimental design used allowed a thorough investigation of the uncertainty contribution from each method parameter to the overall expanded uncertainty of the measurement. The results showed that the parameters making the largest contributions were the precision of the peak area measurement and the uncertainty associated with the slope of the calibration curve. Therefore, these are the critical parameters that should be targeted in order to reduce the overall measurement uncertainty. For iron, the wash blank also gave a measureable contribution.
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More information
Accepted/In Press date: 16 August 2014
e-pub ahead of print date: 23 August 2014
Published date: February 2015
Keywords:
Flow injection, ICP-MS, Preconcentration, Quadrupole, Seawater, Trace metals
Identifiers
Local EPrints ID: 413896
URI: http://eprints.soton.ac.uk/id/eprint/413896
ISSN: 0039-9140
PURE UUID: 44c4a634-6951-44ee-bbee-6369378fa225
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Date deposited: 08 Sep 2017 16:31
Last modified: 06 Jun 2024 01:51
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Contributors
Author:
Robert Clough
Author:
Hagit Sela
Author:
Angela Milne
Author:
Serife Tokalioglu
Author:
Paul J. Worsfold
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