ABSTRACT
A further m e t h o d of p reconcen t ra t ion i n v o l v e s a d d i n g to the s a m p l e a s o l u t i o n of a sui table m e t a l s u c h as i r o n , z i r c o n i u m or i n d i u m a n d f o l l o w i n g this b y a p rec ip i t a t ing agent w h i c h precipi ta tes n o t o n l y the a d d e d m e t a l b u t a lso coprecipi ta tes the meta ls w h i c h i t is r e q u i r e d to de te rmine i n the sample . T h e prec ip i ta te i so la ted f r o m a large v o l u m e of o r i g i n a l w a t e r s a m p l e is then i so la ted a n d d i s s o l v e d i n a s m a l l v o l u m e of a c i d to p r o v i d e a concentrate for ana lys i s .
