New Soil Reference Material Validation for Trace and Rare-Earth Elements by High-Resolution Inductively Coupled Plasma M
- PDF / 1,060,181 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 77 Downloads / 120 Views
CASE REPORT
New Soil Reference Material Validation for Trace and Rare-Earth Elements by High-Resolution Inductively Coupled Plasma Mass Spectrometry K. Kiruba, M. Satyanarayanan* , S. S. Sawant, K. S. V. Subramanyam, B. Dasaram and G. Vamsi Krishna Geochemistry Division, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500007, India Received: 14 May 2020 / Accepted: 15 September 2020 Metrology Society of India 2020
Abstract: Inductively coupled plasma mass spectrometry (ICP-MS) has become inevitable for quantitative determination of trace and ultra-trace elements in geological samples. Inferences derived from ICP-MS data sets and other supportive evidence have revolutionized theories on geology/geodynamics. In this scenario, validation through interlaboratory studies plays an important role in assuring the quality of measurements, along with the performance and accreditation programs of the laboratory. The Geological Survey of India (GSI) initiated an interlaboratory testing program on soil and stream sediment testing in which about fifteen laboratories, including our geochemical laboratory participated. Trace and rareearth elements (REE) determined on the reference material PKS-1 by high-resolution ICP-MS and validated with the certified values for PKS-1 provided by GSI after compilation. The fitness of acquired data for either ‘‘pure geochemistry’’ or ‘‘applied geochemistry’’ was determined based on the Z-scores. The data for most of the analytes fell within the 2 \ Z \ ? 2 range, which included the majority of the trace and REE used in petrogenetic and provenance studies. These results help to review the analytical mismatches observed in the data, optimize necessary aspects and minimize the interference effects caused during analysis. Keywords: Interlaboratory testing; HR-ICP-MS; Stream soil sediments; Reference material; Trace metals; Z-score 1. Introduction The geochemical analysis of elements has become a fundamental method for studying geological characteristics and evolution that has increased the necessity for geochemical reference materials to avoid large differences in the results of analytical techniques [1]. Geological materials such as minerals, rocks, ores, sediments and soils have highly variable chemical compositions and contain mostly all the elements of the periodic table in relatively complex matrices [2]. In order to chemically analyze certain elements accurately, the elemental variation in different matrices should be determined precisely. Hence, for accurate chemical analysis, it is essential to make use of the reference materials with similar chemical composition, which are referred as geochemical reference materials (GRM) [2]. These GRMs play an effective role in
controlling the quality of chemical analysis in several geological materials around the world and it is essential for chemical laboratories to have access to several varieties of certified GRMs, to assess measurement quality [3]. The most important applications of GRM are to develop chemical analysis methods
Data Loading...
