Affordable Access

deepdyve-link
Publisher Website

A practical guide for the design and implementation of the double-spike technique for precise determination of molybdenum isotope compositions of environmental samples.

Authors
  • Skierszkan, E K1
  • Amini, M
  • Weis, D
  • 1 Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2020-2207 Main Mall, Vancouver, V6T 1Z4, Canada, [email protected] , (Canada)
Type
Published Article
Journal
Analytical and Bioanalytical Chemistry
Publisher
Springer-Verlag
Publication Date
Mar 01, 2015
Volume
407
Issue
7
Pages
1925–1935
Identifiers
DOI: 10.1007/s00216-014-8448-6
PMID: 25651900
Source
Medline
License
Unknown

Abstract

The isotopic double-spike method allows for the determination of stable isotope ratios by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) with accuracy and precision in the range of ∼0.02 ‰ amu(-1), but its adoption has been hindered by the perceived difficulties in double-spike calibration and implementation. To facilitate the implementation of the double-spike approach, an explanation of the calibration and validation of a (97)Mo-(100)Mo double-spike protocol is given in more detail than has been presented elsewhere. The long-term external standard reproducibility is 0.05 ‰ on δ(98/95)Mo measurements of standards. δ(98/95)Mo values for seawater and U.S. Geological Survey (USGS) reference materials SDO-1 and BCR-2 measured in this study are 2.13 ± 0.04 ‰ (2 SD, n = 3), 0.79 ± 0.05 ‰ (2 SD, n = 11), and -0.04 ± 0.10 ‰ (2 SD, n = 3) relative to the NIST-SRM-3134. The double-spike method corrects for laboratory and instrumental fractionation which are not accounted for using other mass bias correction methods. Spike/sample molar ratios between 0.4 and 0.8 provide accurate isotope measurements; outside of this range, isotope measurements are inaccurate but corrections are possible when standards and samples are spiked at a similar ratio.

Report this publication

Statistics

Seen <100 times