Reference material OREAS 25a was sourced from an in situ layer of mature soil developed over early tertiary tholeiitic basalt in outer eastern Melbourne, Victoria, Australia. Ten commercial analytical laboratories participated in the program to characterise the elements reported in Tables 1 to 6 (please download certificate). The elements listed below are only a subset of the certified values. The following methods were employed:
- Lithium borate fusion for full suite X-ray fluorescence (9 laboratories)
- Sodium peroxide fusion or lithium borate fusion for full suite ICP-OES and ICP-MS (10 laboratories)
- Four acid digestion for full suite ICP-OES and ICP-MS (9 laboratories)
- Aqua regia digestion for full suite ICP-OES and ICP-MS (9 laboratories)
- Fire assay with ICP-OES and ICP-MS for Au, Pd and Pt (9 laboratories)
- Infra-red combustion furnace for C and S (9 laboratories)
- Thermogravimetry for LOI (10 laboratories)
OREAS 25a is a SuperCRM®
| CRM Code |
Principle Certified Values |
State |
Matrix |
Mineralization |
| OREAS 25a |
Au <2ppb |
Cu 33.9ppm |
Pb 25.2ppm |
oxide |
ferruginous soil |
barren |
