140 samples were analyzed by the following methods and digestions: INAA and AA after HCl:HNO3 (3:1) acid digestion.139 samples were analyzed by ICP after HF-HNO3-HClO4 acid digestion with HCl leach. 125 samples were analyzed by XRF. 93 samples were analyzed by CVAA after HCl:HNO3 (3:1) acid digestion. 2 samples was analyzed by DC Plasma Emission after NaOH fusion. Sn interference noted due to Ba.