ABSTRACT
T h e m e t h o d s of p reconcen t r a t ion u s e d are d i s cus sed u n d e r f ive headings :
(a) P reconcen t ra t ion b y ext rac t ion of wa te r w i t h a r e l a t ive ly s m a l l v o l u m e of a n o rgan ic solvent . F o r further detai ls see C h a p t e r 20.
