Sample Weight: 30 g
The sample is weighed and mixed with fluxing agents to assist with melting and promote separation from waste (gangue) materials from the precious metals. After cooling, the gangue is separated and discarded as a glassy slag from the precious metal containing lead button. This button is further heated on an absorbing magnesium oxide crucible to remove the lead and trace amounts of base metals. A small silver prill is left containing the precious metals. The silver prill is digested in aqua regia then analyzed by ICP-MS.
|Element||Concentration (low)||Concentration (high)|
|Au, Gold||1 ppb||10,000 ppb|
|Pd, Palladium||1 ppb||10,000 ppb|
|Pt, Platinum||5 ppb||10,000 ppb|
Data will be deemed acceptable if recovery of each element is ±20% at five times the Lower Limit of Determination (LOD) and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 20%.
Central Mineral and Environmental Resources Science Center