The future demand for geological reference materials

This work provides a measurement procedure for the complete digestion of rock samples containing refractory minerals such as zircon and chromite. Their dissolution by wet acid digestion is often incomplete but, although providing complete digestions, alkali fusion techniques can result in solutions with a high blank and total dissolved solid content. It was established by the systematic study with reference material trachyandesite MTA‐1 that a 1:6 sample to sodium peroxide (Na2O2) ratio is conservative for the complete digestion and recovery of all the analytes especially those contained in zircon. The sample decomposition time was 120 min for the zircon‐bearing rhyolite reference material MRH‐1. Complete digestion of chromite was obtained in the harzburgite RM MUH‐1. The sample solutions were stable for at least 1 year. Accurate measurements of SiO2, Al2O3, TiO2, P2O5 and K2O could be made with ICP‐MS by not discarding the supernatant of the sinter solution and by using geological reference materials for external calibration. HF digestions are slow, not universal, and may form new mineral/phases that are insoluble under high temperature conditions. The validated sample decomposition procedure combined with ICP‐MS presents an alternative to the use of HF in routine analysis of difficult to digest geological materials.

“…Matrix‐matched calibrations of reference materials have been used to minimise the matrix effect, which also leads to signal drift (de Madinabeitia et al . , Meisel and Kane ).…”

mentioning

confidence: 97%

Method Development and Optimisation of Sodium Peroxide Sintering for Geological Samples

Bokhari

Meisel

2016

“…0.78‰ (2 RSD) or better when 0.5 g of WPR-1 was used. The 187 Os/ 188 Os ratios of WPR-1 from different laboratories exhibit some discrepancy (see Table 6), which could be introduced by chemical procedures, performance parameters of the instrument or other unknown reasons (Meisel et al 2011). Nevertheless, all of the data are consistently within the range of reproducibility precision.…”

Section: Measurement Results For Geological Reference Materialsmentioning

confidence: 97%

High‐Precision Measurement of ¹⁸⁷Os/¹⁸⁸Os Isotope Ratios of Nanogram to Picogram Amounts of Os in Geological Samples by N‐TIMS using Faraday Cups Equipped with 10¹³ Ω Amplifiers

Wang

Vollstaedt

2019

N(187Os)/N(188Os) ratios of six geological reference materials were measured using static Faraday cups (FCs) with 1013 Ω amplifiers by N‐TIMS. Our results show that the repeatability precision was 2–3‰ (2 RSD, n = 3), when taking ~ 1 g of BHVO‐2 with 76 pg g−1 of Os mass fraction and ~ 2 g of BCR‐2 with 21 pg g−1 of Os mass fraction for each sample, whether measured by FCs or by secondary electron multiplier. The repeatability precision measured by FCs was 1–0.2‰ (2 RSD, n = 3) when taking ~ 1 g of BIR‐2 with 350 pg g−1 of Os mass fraction, ~ 1 g of WGB‐1 with 493 pg g−1 of Os mass fraction or ~ 0.5 g of WPR‐1 with 13.3 ng g−1 of Os mass fraction for each sample, which is much better than those measured by secondary electron multiplier. Instead, when taking ~ 2 g of AGV‐2 with 4 pg g−1 Os mass fraction, the repeatability precision measured by secondary electron multiplier is 3–4‰ (RSD, n = 3), which is better than those measured by FCs. Of the six reference materials analysed, WPR‐1 and BIR‐1a are the most homogeneous with regard to Os isotopic composition (2 RSD of 0.08% and 0.23%, respectively) when test portion masses are 0.5–1 g.

“…In conclusion, when discussing the future demand for geological reference materials, Meisel and Kane () noted that, while microanalytical techniques have become the major impetus in geochemical research, there still remains geoanalytical interest and demand for bulk elemental analyses – INAA still has much to offer in this regard.…”

Section: Instrumental Neutron Activation Analysis (Contribution By Mmentioning

confidence: 99%

“…Historically, geochemical RMs were produced using the best practices available (Kane , Meisel and Kane ). The necessity to follow and apply metrological principles motivated the International Association of Geoanalysts (IAG) to elaborate a protocol for the certification of geochemical RMs, with procedures compliant to ISO/REMCO guidelines (Kane et al .…”

Section: Reference Materials For Geoanalytical and Environmental Resementioning

confidence: 99%

“…Kane () exemplifies the calculation of combined uncertainties of certified values and also discusses the achievements and needs of the IAG certification programme. Recently, it has became apparent that the IAG protocol needs to undergo revision to comply with the new editions of ISO Guides 35 and 34 (Meisel and Kane ). Participation in a PT scheme can be used for both quality control and for laboratory accreditation purposes.…”

Section: Reference Materials For Geoanalytical and Environmental Resementioning

confidence: 99%

See 1 more Smart Citation

GGR Biennial Critical Review: Analytical Developments Since 2010

Wiedenbeck

Bugoi

Duke

et al. 2012

Advances in the chemical and isotopic characterisation of geological and environmental materials can often be ascribed to technological improvements in analytical hardware. Equally, the creation of novel methods of data acquisition and interpretation, including access to better reference materials, can also be crucial components enabling important breakthroughs. This biennial review highlights key advances in either instrumentation or data acquisition and treatment, which have appeared since January 2010. This review is based on the assessments by scientists prominent in each of the given analytical fields; it is not intended as an exhaustive summary, but rather provides insight from experts of the most significant advances and trends in their given field of expertise. In contrast to earlier reviews, this presentation has been formulated into a unified work, providing a single source covering a broad spectrum of geoanalytical techniques. Additionally, some themes that were not previously emphasised, in particular thermal ionisation mass spectrometry, accelerator‐based methods and vibrational spectroscopy, are also presented in detail.