All 12 samples were analyzed by the following methods and digestions: INAA, ICP after HF-HNO3-HClO4 acid digestion with HCl leach, AA after HNO3-HCl hot extraction, and CVAA after HNO3-HCl-SnSO4 acid digestion. Samples that indicate interference in the results are due to high levels of As and Sb.