Description |
Stream sediment samples consist of silt to clay-sized particles found in streams or along stream banks. Rock samples were dried, crushed, and pulverized to at least 100 mesh, however no sample dissolution was required. Rock samples were preconcentrated using a solution of nitric-aqua-regia leach techniques before analysis using either atomic absorption or inductively coupled argon plasma spectroscopy. Several samples were analyzed for the element using both techniques. The results from the more accurate method is reported. Several rock chip samples were analyzed for rare-earth elements (REE) by neutron activation analysis (NAA). |