Calcium Carbonate and Phosphate Reference Materials for Monitoring Bulk and Microanalytical Determination of Sr Isotopes. Issue 1 (10th October 2017)

• Record Type: Journal Article
• Authors: Weber, Michael; Lugli, Federico; Jochum, Klaus Peter; Cipriani, Anna; Scholz, Denis
• Is Part Of: Geostandards and geoanalytical research. Volume 42:Issue 1(2018)
• Page Start: 77
• Page End: 89
• Publication Date: 2017-10-10
• Subjects: strontium isotopes -- laser ablation -- multi‐collector inductively coupled plasma‐mass spectrometers -- reference material -- calcium carbonates -- phosphates; Analytical geochemistry -- Periodicals; Géochimie analytique -- Périodiques; 551.9
• DOI: 10.1111/ggr.12191
• Languages: English
• ISSNs: 1639-4488

Abstract

Abstract : In situ laser ablation analyses rely on the microanalytical homogeneity of reference materials (RMs) and a similar matrix and mass fraction between unknown samples and RMs to obtain reliable results. Suitable carbonate and phosphate RMs for determination of Sr isotope ratios in such materials are limited. Thus, we determined 87 Sr/ 86 Sr ratios of several carbonate (JCt‐1, JCp‐1, MACS‐1, MACS‐3) and phosphate (MAPS‐4, MAPS‐5, NIST SRM 1400, NIST SRM 1486) international RMs using dissolved samples and two different multi‐collector inductively coupled plasma‐mass spectrometers (MC‐ICP‐MS). Our Sr isotope data are in agreement with published data and have an improved measurement precision for some RMs. For MACS‐1, we present the first 87 Sr/ 86 Sr value. We tested the suitability of these materials for microanalytical analyses by LA‐MC‐ICP‐MS, with two different laser ablation systems: a conventional nanosecond laser and a state‐of‐the‐art femtosecond laser. We investigated the RMs micro‐homogeneity and compared the data with our solution data. Both laser ablation systems yielded identical 87 Sr/ 86 Sr ratios within uncertainty to the solution data for RMs with low interferences of REEs. Therefore, these carbonate and phosphate RMs can be used to achieve accurate and precise results for in situ Sr isotope investigations by LA‐MC‐ICP‐MS of similar materials. Key Points: Sr isotope data for calcium carbonate and phosphate reference materials. Comparison of laser ablation and solution MC‐ICP‐MS values with literature data. Applicability of high‐precision data for validation and monitoring purposes for laser ablation work on carbonate and phosphate samples.