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Secondary Ion Mass Spectrometry Bias on Isotope Ratios in Dolomite-Ankerite, Part II: δ13C Matrix Effects

Journal Article · · Geostandards and Geoanalytical Research
 [1];  [2];  [3];  [2];  [2];  [2];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States); UW-Madison
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Univ. of Wisconsin, Madison, WI (United States); State Univ. of New Jersey, New Brunswick, NJ (United States)

Here, this study is Part II of a series that documents the development of a suite of calibration reference materials for in situ SIMS analysis of stable isotope ratios in Ca-Mg-Fe carbonates. Part I explored the effects of Fe2+ substitution on SIMS δ18O bias measured from the dolomite–ankerite solid solution series [CaMg(CO3)2–CaFe(CO3)2], whereas this complementary work explores the compositional dependence of SIMS δ13C bias (calibrated range: Fe# = 0.004–0.789, where Fe# = molar Fe/(Mg+Fe)). Under routine operating conditions for carbonate δ13C analysis at WiscSIMS (CAMECA IMS 1280), the magnitude of instrumental bias increased exponentially by 2.5–5.5‰ (session-specific) with increasing Fe-content in the dolomite structure, but appeared insensitive to minor Mn substitution [< 2.6 mole % Mn/(Ca+Mg+Fe+Mn)]. The compositional dependence of bias (i.e., the matrix effect) was expressed using the Hill equation, yielding calibration residual values ≤ 0.3‰ relative to CRM NBS-19 for eleven carbonate reference materials (6-μm-diameter spot size measurements). Based on the spot-to-spot repeatability of a drift monitor material that ‘bracketed’ each set of ten sample-spot analyses, the analytical precision was ± 0.6–1.2‰ (2s, standard deviations). The analytical uncertainty for individual sample analyses was approximated by combining the precision and calibration residual values (propagated in quadrature), suggesting an uncertainty of ± 1.0–1.5‰ (2s).

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
FG02-93ER14389
OSTI ID:
1666244
Journal Information:
Geostandards and Geoanalytical Research, Journal Name: Geostandards and Geoanalytical Research Journal Issue: 2 Vol. 40; ISSN 1639-4488
Publisher:
Wiley - International Association of GeoanalystsCopyright Statement
Country of Publication:
United States
Language:
English

References (10)

Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide journal January 1957
Microanalysis of oxygen isotopes in insulators by secondary ion mass spectrometry journal October 1992
SIMS analysis of oxygen isotopes: matrix effects in complex minerals and glasses journal June 1997
Measurement of light stable isotope ratios by SIMS: journal October 1998
High precision SIMS oxygen isotope analysis and the effect of sample topography journal June 2009
Crystal orientation effects in δ18O for magnetite and hematite by SIMS journal September 2010
On the Isotopic Chemistry of Carbonates and a Paleotemperature Scale journal June 1950
The Hill equation: a review of its capabilities in pharmacological modelling journal December 2008
Secondary Ion Mass Spectrometry Bias on Isotope Ratios in Dolomite-Ankerite, Part I: δ 18 O Matrix Effects journal August 2015
SIMS stable isotope measurement: counting statistics and analytical precision journal February 2000

Cited By (3)

A new Chinese national reference material (GBW04481) for calcite oxygen and carbon isotopic microanalysis journal December 2019
Ion microprobe–measured stable isotope evidence for ammonite habitat and life mode during early ontogeny journal September 2018
Predicting instrumental mass fractionation (IMF) of stable isotope SIMS analyses by response surface methodology (RSM) journal January 2017

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