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.

经认证的参考材料（CRM）用于评估分析方法，质量保证和分析结果可追溯至国际标准。烟煤是具有高热容量和低水分含量的中等级煤。烟煤粉CRM（BND 5101A）已开发并通过灰分，总热值（GCV），挥发物（VM）和总硫（S）含量的认证，为22.16±0.15％；6114±44大卡/千克; 分别为29.2±0.36％和0.71±0.04％。为此目的而选择的煤炭样品是从中央煤田有限公司的一个露天矿中采集的高等级烟煤样品。这项工作是由CSIR-中央矿业与燃料研究所（CSIR-CIMFR）联合进行的， Dhanbad和CSIR国家物理实验室（CSIR-NPL），新德里。根据ISO / IEC 17043：2010，在该国28个著名的煤炭实验室中进行了能力测试（PT）计划。根据PT计划中实验室的绩效，根据ISO 13528：2015选择了8个实验室进行实验室间比较（ILC）计划。本文介绍了用于制备煤炭标准物质的方法，均质性，稳定性研究以及为验证灰分，GCV，VM和总S含量而进行的ILC分析和统计工作。