IMS-191

IMS-191 is a basalt-hosted gold (Au) certified reference material (CRM) designed for rigorous quality control in fire assay gold analysis for mining and exploration laboratories. Certified in accordance with ISO 17034:2016 and ISO Guide 35:2017, this CRM is a homogenized blend of pulverized basalt spiked with gold, validated across 13 ISO/IEC 17025-accredited laboratories for exceptional reliability. 

Key Features 

• Certified Au content: 0.98 g/t ± 0.027 g/t (1 SD).
• Method-specific validation: Optimized for Pb collection fire assay (AAS/ICP finish) using 30–50g aliquots. 
• Supplied in 1 kg PET jars or 6 kg boxes, ensuring long-term stability and ease of use. 
• 5-year validity when stored sealed in cool, dry conditions. 

Key Certified Values 

Intended Use 

• QC monitoring: Calibration and validation of fire assay methods (minimum 30g sample mass). 
• Bias detection: Identifying laboratory or procedural errors in Au analysis. 
• Homogeneity assurance: Certified for low variability (RSD 4.03% in homogeneity studies).