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 CSIR-Central Institute of Mining and Fuel Research (CSIR-CIMFR), Dhanbad and CSIR-National Physical Laboratory (CSIR-NPL), 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.
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