Preparation and Certification of Reference Materials (GBW07397, GBW07398, GBW07399 and GBW07400) for Selenium and Other Trace Element Mass Fractions

Abstract

The preparation and characterisation of certified reference materials of four selenium-rich rocks (GBW07397 to GBW07400) are described in this paper. The raw materials were derived from selenium-rich rocks in two famous seleniferous regions, Enshi Prefecture, Hubei Province and Ziyang County, Shaanxi Province, China. Sample homogeneity and stability were tested by inductively coupled plasma-mass spectrometry and atomic fluorescence spectrometry. The determined element mass fractions included selenium, arsenic, copper, zinc, molybdenum, cadmium, lead, vanadium and silver. Except for silver, the results of analysis of variance (ANOVA) and the relative standard deviations of the element mass fractions showed that the four materials exhibited good homogeneity and stability. Ten laboratories were involved in an interlaboratory comparison scheme for certification. Eight element mass fractions in the selenium-rich rocks were assigned as certified values, while only indicative values were obtained for Ag mass fractions. The certified values and expanded uncertainties for the selenium mass fractions in GBW07397-GBW07400 are 0.96 ± 0.05, 1.03 ± 0.05, 49 ± 4 and 38.5 ± 1.9 lg g -1 , respectively.

Geostandards and Geoanalytical Research Bibliographic Review 2020

“…For many analytical techniques such as microanalysis, it is essential to use matrixmatched RMs for calibration and quality control. A set of four selenium-rich rocks (GBW07397 to GBW07400) has been formalised as CRMs for mass fractions of selenium, arsenic, copper, zinc, molybdenum, cadmium, lead, vanadium and silver by Tang et al (2020). introduced the RMJG rutile -a new microanalytical RM of natural origin for U-Pb dating and Hf isotopic analysis.…”

Atomic spectrometry update – a review of advances in environmental analysis

“…Four new selenium-rich rock RMs (GBW07397 to GBW07400) with Se mass fractions from 38.5 to 1030 μg g −1 were prepared 230 by the China University of Geosciences following ISO guidelines and analysed in 10 laboratories by a variety of methods. Certified values were assigned for As, Cd, Cu, Mo, Pb, Se, V and Zn and the materials were approved as national CRMs.…”

Preparation Of Five Selenium-Rich Soil Reference Materials, Their Se, Cr, Ni, Zn, Cd, Pb Mass Fraction Certifications And A Study Of Se Geochemical Fractionation

“…In addition, BCR-320R and BCR-667 were produced by the Institute of Reference Materials and Measurement (IRMM), with Se mass fractions certified to be 0.96 ± 0.18 μg g -1 and 1.59 ± 0.08 μg g -1 , respectively. The soil CRM series JSAC0461-JSAC0466 produced by the Japan Society for Analytical Chemistry (JSAC) was certified as 0.44-1175 ± 26 μg g -1 for Se mass fractions, measuring by atomic fluorescence spectrometry (AFS), hydride generation-atomic adsorption spectrometry (HG-AAS), hydride generation-inductively coupled plasma-mass spectrometry (HG-ICP-MS), and ICP-MS. 18 In China, the Se mass fractions of Serich rock CRMs, such as the series GBW07397-GBW07400 that measured by AFS and inductively coupled plasma-atomic emission spectrometry (ICP-OES) 19 and GBW07729, were certified as 38.5 ± 1.9 μg g -1 to 1.03 ± 0.05 mg g -1 and 29.7 ± 3.6 μg g -1 , respectively, which are very high compared to most natural Se-rich soils. Se mass fractions in other soil CRM series such as GBW07401-GBW07408, GBW07423-GBW07430, GBW07446-GBW07457, and GBW07385-GBW07391, developed by the Institute of Geophysical and Geochemical Exploration (IGGE) of China, were mostly too low to be as quality control materials for Se-rich soil analysis.…”