ABSTRACT

There are a n u m b e r of a d d i t i o n a l techniques w h i c h have been adap ted for the p reconcen t ra t ion of cat ions as a means of inc reas ing the sens i t iv i ty of ana lys i s for these substances. M a n y of these techniques are of v a l u e i n pa r t i cu la r app l i ca t ions a n d are d i scussed here u n d e r v a r i o u s b r o a d headings . Techniques that have been u s e d for cat ions i n c l u d e : e lectrolyt ic ; gas e v o l u t i o n ; f l o t a t i o n ; e v a p o r a t i o n / d i s t i l l a t i o n ; p r e c i p i t a t i o n / c rys ta l l i sa t ion a n d d i a l y s i s / o s m o s i s .