Determination of Trace Metals Using Laser Induced ...
The samples were first dried and grinded in Spectro Mill Ball Pestle impact Grinder (Model 1100-11, Chemplex Industries, Inc., USA) to suitable mesh size for the preparation of pellets. The pellets were made in a dye of cylindrical form having diameter 20 mm and thickness 2 mm using a hydraulic press (Carver Laboratory Press Model, C Sterling USA).