IMS-235
IMS-235 is a gold-hosted silicate rock certified reference material (CRM) designed for precision quality control in gold analysis via Pb fire assay, X-ray photon assay, and PAL (partial leach) methods for mining and exploration laboratories. Certified in accordance with ISO 17034:2016and ISO Guide 35:2017, this CRM is a homogenized blend of crushed silicate rock with dispersed gold, validated across multiple ISO/IEC 17025-accredited laboratories for reliability in gold analysis across different methods.
Key Features
- Optimized for multiple methods: Validated for Pb fire assay (AAS/ICP finish), X-ray photon assay, and PAL (cyanide leach with AAS)
- Supplied in 500g or 2kg heat-sealed bags, ensuring integrity and batch consistency
- 5-year validity when stored in dry, dark conditions
Key Certified Values
|
Analyte |
unit |
Certified Value (y) |
Standard Deviation (s) |
95% Confidence Interval (CI) |
||
|
1 SD |
1 SD Within Lab |
lower |
upper |
|||
|
As-received X-ray Photon Assay (500g) |
||||||
|
Au |
g/t |
0.22 |
0.023 |
0.025 |
0.22 |
0.23 |
|
Sample Preparation and Pb Fire Assay (2kg) |
||||||
|
Au |
g/t |
0.23 |
0.007 |
0.006 |
0.22 |
0.23 |
Key Informational Values
|
Analyte |
unit |
Certified Value (y) |
Standard Deviation (s) |
95% Confidence Interval (CI) |
||
|
1 SD |
1 SD Within Lab |
lower |
upper |
|||
|
As-received PAL (500g) |
||||||
|
Au |
g/t |
0.14 |
0.015 |
0.009 |
0.13 |
0.15 |
Intended Use
- QC monitoring: Calibration and validation of fire assay, photon assay, and PAL methods for gold analysis
- Bias detection: Identifying systematic errors in laboratories processing gold-bearing samples
- Homogeneity assurance: Certified for low variability (Pb Fire Assay RSD: 1.72%; Photon Assay RSD: 8.12%)
- Sample preparation control: Ensures accuracy in crushing, sub-sampling, and assay workflows
