Preparation and Certification of Indian Reference Material of Bituminous Coal
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ORIGINAL ARTICLE
Preparation and Certification of Indian Reference Material of Bituminous Coal T. B. Das1, U. S. Chattopadhyay1, D. Soni2,3*, K. Singh2 and P. K. Singh1 1
CSIR-Central Institute of Mining and Fuel Research, Dhanbad, India 2
CSIR-National Physical Laboratory, New Delhi 110012, India
3
Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus, New Delhi, India Received: 09 July 2020 / Accepted: 10 October 2020 Ó Metrology Society of India 2020
Abstract: Certified reference materials (CRMs) are used for evaluating analytical methods, quality assurance and traceability of analytical results to international standards. Bituminous coal is the medium grade coal with high heating capacity and low moisture content. CRM of bituminous coal powder (BND 5101A) has been developed and certified for ash, gross calorific value (GCV),volatile matter (VM) and total sulphur (S) content as 22.16 ± 0.15%; 6114 ± 44 kcal/kg; 29.2 ± 0.36% and 0.71 ± 0.04%, respectively. The sample of coal selected for the purpose is high-rank bituminous type, which was collected from an opencast mine of Central Coalfields Ltd. The work has been carried out jointly by CSIRCentral Institute of Mining and Fuel Research (CSIR-CIMFR), Dhanbad and CSIR-National Physical Laboratory (CSIRNPL), New Delhi. Proficiency testing (PT) program was carried out among 28 reputed coal laboratories of the country in accordance with ISO/IEC 17043:2010. Based on the performance of laboratories in the PT program, 8 laboratories were selected for inter-laboratory comparison (ILC) program as per ISO 13528:2015. This paper describes the methodology employed for the preparation of a coal reference material, homogeneity, stability studies and the ILC analytical and statistical work performed for the certification of the contents of ash, GCV, VM and total S. Keywords: Bituminous coal; Indian reference material; Proficiency testing; Inter-laboratory comparison; Homogeneity; Traceability 1. Introduction Many important decisions related to trade, commerce, legal issues and solving disputes are based on the accurate analytical results. The various means to achieve accurate analytical results include: quality system, training of personnel, validated methods and use of certified reference materials (CRMs). The use of CRM is vital to minimize or eliminate the systematic errors while carrying out the analysis even while using a validated or standard method of analysis. Data reliability is assured only when appropriate quality control/quality assurance (QC/QA) regimen is strictly adhered throughout the analytical process. A key component of the QC/QA procedure is the use of certified reference materials (CRMs) to validate the analytical
*Corresponding author, E-mail: [email protected]
method and to ensure that data generated are traceable to SI unit. For quality control purposes, the application of CRMs in analytical chemistry is well established and recommended by a wide range of international, national and professional organizat
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