ABSTRACT
M e t a l che la t ing resins a n d i m m o b i l i s e d (adsorbed or c h e m i c a l l y bonded ) chelates have f o u n d w i d e s p r e a d a p p l i c a t i o n for the concent ra t ion a n d / o r separat ion of trace metals f r om a v a r i e t y of matr ices . D i m e t h y l g l y o x i m e , a l k y l a m i n e s , d i a m i n e s , xanthates, a n d d i th ioca rbamates , p r o p y l e n e - diaminetetraacet ic acids , n - b u t y l a m i d e s , N-subs t i tu t ed h y d r o x y l a m i n e , h e x y l t h i o g l y c o l a t e , f e r ro in - type c h e l a t i n g agents , i m i n o d i a c e t a t e , a m i d o x i m e , d i t h i z o n e , a n d 8 -hyd roxyqu ino l ine have a l l b een i m m o b i l i s e d o n va r ious substrates. Ta i l o r i ng c h e m i c a l l y b o n d e d che la t ing agents to specific needs a l l o w s the use of select ive or genera l concent ra t ion schemes a n d also pe rmi t s the ' r e cyc l i ng ' of the che la t ing agent. T h e i r major use l ies i n the p reconcent ra t ion of trace m e t a l i ons f rom aqueous a n d sa l ine m e d i a .
