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Abstract
Boron (B) isotopes are widely used in the Earth sciences to trace
processes ranging from slab recycling in the mantle to changes in ocean
pH and atmospheric CO2. Boron isotope analysis is
increasingly achieved by multi-collector inductively coupled plasma mass
spectrometry, which requires separation of B from the sample matrix.
Traditional column chromatography methods for this separation have a
well-established track record but are time consuming and prone to
contamination from airborne blank. Here, we present an extensive array
of tests that establish a novel method for B purification using a batch
method. We discuss the key controls and limitations on sample loading,
matrix removal and B elution including sample volume, ionic strength,
buffer to acid ratio and elution volume, all of which may also help
optimize column-based methods. We find consistent, low procedural blanks
of 10 ± 16 pg and excellent reproducibility: 10 ng NIST RM 8301 foram
[8301f] yields 14.58 ± 0.11‰ 2SD n = 15; 2.5 ng 8301f yields 14.60 ± 0.19‰ 2SD, n = 31; and overall long term 2SD on n = 218
samples pooling different sample sizes yields 14.62 ± 0.21‰ 2SD. This
method also offers significant advantages in throughput, allowing the
processing of 24 samples in ∼5 hr. This boron batch method thus provides
a fast, reproducible, low-blank method for purification of boron for
high precision isotopic analyses.
Original language | English |
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Article number | e2023GC011350 |
Journal | Geochemistry, Geophysics, Geosystems |
Volume | 25 |
Issue number | 3 |
DOIs | |
Publication status | Published - 15 Mar 2024 |
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Dive into the research topics of 'A simple, low-blank batch purification method for high-precision boron isotope analysis'. Together they form a unique fingerprint.Projects
- 1 Finished
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OldCO2NewArchives: CO2 reconstruction: OldCO2NewArchives: CO2 Reconstruction over the last 100 Myr from novel geological archives
Rae, J. W. B. (PI)
1/02/19 → 31/01/24
Project: Fellowship
Datasets
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A simple, low-blank batch purification method for high-precision boron isotope analysis- supporting dataset
Trudgill, M. D. (Creator), Nuber, S. (Creator), Block, H. (Creator), Crumpton-Banks, J. G. M. (Creator), Jurikova, H. (Creator), Littley, E. (Creator), Shankle, M. (Creator), Xu, C. (Creator), Steele, R. C. J. (Creator) & Rae, J. W. B. (Creator), University of St Andrews, 17 Mar 2024
DOI: 10.17630/bb69c2f8-03fc-4b91-82b1-300bac07ac42
Dataset
File