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Hf isotope ratio analysis using multi-collector inductively coupled plasma mass spectrometry: an evaluation of isobaric interference corrections

Hf isotope ratio analysis using multi-collector inductively coupled plasma mass spectrometry: an evaluation of isobaric interference corrections
Hf isotope ratio analysis using multi-collector inductively coupled plasma mass spectrometry: an evaluation of isobaric interference corrections
From measurements of Hf–Yb mixtures, we have found that the correction of isobaric interferences involving accepted Yb isotope ratios and reasonable estimates of mass bias result in a significantly under-corrected 176Hf, which is proportional to the amount of Yb added. This can be explained by (1) a significant difference in the instrumental mass bias between Hf and Yb, and (2) that the accepted values for isotopic ratios within the Yb and/or Hf systems are incorrect. We have evaluated these possibilities by measuring mixed solutions of Yb and Hf on two MC-ICP-MS instruments and undertaking a series of REE fractionation experiments using a thermal ionisation mass spectrometer (TIMS). Our results indicate that the presently accepted abundances of the Yb isotopes are not appropriate. We present new values for Yb isotopic abundances based on the TIMS and MC-ICP-MS results. Using the newly defined Yb values, we demonstrate that Yb and Hf have similar levels of mass bias in plasma ionisation instruments, and that Hf isotope ratios can be used to correct Yb mass bias before subsequent correction of isobaric interference. A laser ablation comparison of Yb and Hf indicates that similar relationships exist, and can be applied to micro-analytical techniques where chemical separation is not possible.
0267-9477
1567-1574
Chu, N-C.
172006e7-7bfd-4927-8cdc-0b7910231332
Taylor, R.N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Chavagnac, V.
0824a679-684f-47ba-8ccd-f8d36cc18d90
Nesbitt, R.W.
6a124ad1-4e6d-4407-b92f-592f7fd682e4
Boella, R.M.
8cc9b9cb-bb4d-4954-8542-4dd034afaf6e
Milton, J.A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Bayon, G.
ebd811fb-f5b9-4b3b-87b7-72b6c80cdfcf
Burton, K.
5a0824db-5013-4746-81ea-76dd6c4383e8
Chu, N-C.
172006e7-7bfd-4927-8cdc-0b7910231332
Taylor, R.N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Chavagnac, V.
0824a679-684f-47ba-8ccd-f8d36cc18d90
Nesbitt, R.W.
6a124ad1-4e6d-4407-b92f-592f7fd682e4
Boella, R.M.
8cc9b9cb-bb4d-4954-8542-4dd034afaf6e
Milton, J.A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Bayon, G.
ebd811fb-f5b9-4b3b-87b7-72b6c80cdfcf
Burton, K.
5a0824db-5013-4746-81ea-76dd6c4383e8

Chu, N-C., Taylor, R.N., Chavagnac, V., Nesbitt, R.W., Boella, R.M., Milton, J.A., German, C.R., Bayon, G. and Burton, K. (2002) Hf isotope ratio analysis using multi-collector inductively coupled plasma mass spectrometry: an evaluation of isobaric interference corrections. Journal of Analytical Atomic Spectrometry, 17 (12), 1567-1574. (doi:10.1039/b206707b).

Record type: Article

Abstract

From measurements of Hf–Yb mixtures, we have found that the correction of isobaric interferences involving accepted Yb isotope ratios and reasonable estimates of mass bias result in a significantly under-corrected 176Hf, which is proportional to the amount of Yb added. This can be explained by (1) a significant difference in the instrumental mass bias between Hf and Yb, and (2) that the accepted values for isotopic ratios within the Yb and/or Hf systems are incorrect. We have evaluated these possibilities by measuring mixed solutions of Yb and Hf on two MC-ICP-MS instruments and undertaking a series of REE fractionation experiments using a thermal ionisation mass spectrometer (TIMS). Our results indicate that the presently accepted abundances of the Yb isotopes are not appropriate. We present new values for Yb isotopic abundances based on the TIMS and MC-ICP-MS results. Using the newly defined Yb values, we demonstrate that Yb and Hf have similar levels of mass bias in plasma ionisation instruments, and that Hf isotope ratios can be used to correct Yb mass bias before subsequent correction of isobaric interference. A laser ablation comparison of Yb and Hf indicates that similar relationships exist, and can be applied to micro-analytical techniques where chemical separation is not possible.

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Published date: 2002

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Local EPrints ID: 58268
URI: http://eprints.soton.ac.uk/id/eprint/58268
ISSN: 0267-9477
PURE UUID: 601f66b4-c650-460a-9037-d4377a09e43a

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Date deposited: 12 Aug 2008
Last modified: 14 Sep 2021 16:53

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