ABSTRACT
Strong base a n i o n exchange resins are manufac tured b y ch lo rome thy la t ion of s u l p h o n a t e d po lys ty rene f o l l o w e d b y react ion w i t h a ter t iary amine :
T h e y u n d e r g o the f o l l o w i n g react ion w i t h anions:
R e s i n — C H 2 N + C 1 + M + + X " -> R e s i n — C H 2 - N + X ~ + C l ~ + M +
or
R e s i n — C H 2 - N + C 1 ~ + M X " - » R e s i n - C H 2 - N + M X " + C l "
where M X " is a m e t a l con t a in ing an ion . Weak base a n i o n exchange resins are manufac tu red b y c h l o r o m e t h y l
a t ion of s u l p h o n a t e d po lys ty rene f o l l o w e d b y react ion w i t h a p r i m a r y or secondary amine :
T h e y u n d e r g o the f o l l o w i n g reac t ion w i t h anions: e g
R e s i n — N + C 1 ~ + X " + M + -> R e s i n - N + M X ~ + C h / l \ / | \ RlR2H RlR2H
or
R e s i n — N + C 1 ' + M X " -> R e s i n — N + M X " + C h / I \ / I \ R * R 2 H R ^ H
where M X - is a m e t a l con t a in ing a n i o n . S o m e basic proper t ies of the v a r i o u s types of a n i o n exchange resins a n d
supp l i e r s are t abula ted i n Table 24.1. T h e l i g a n d 8 - h y d r o x y q u i n o l i n e - 5 - s u l p h o n i c a c i d f o r m s a n i o n i c
complexes w i t h cobalt(II), zinc(II), cadmium(I I ) a n d lead(II). A technique has been desc r ibed [1] for the separa t ion a n d p reconcen t ra t ion of these meta ls i n n o n sal ine waters p r i o r to measurement b y graphi te furnace a tomic a b s o r p t i o n spectrometry. A t o p t i m u m cond i t ions , a l l four meta l s are q u a n t i t a t i v e l y re ta ined as the i r n e g a t i v e l y c h a r g e d 8 - h y d r o x y - q u i n o l i n e - 5 - s u l p h o n i c ac id complexes b y the c o l u m n . Z i n c , c a d m i u m a n d lead(II) ions are comple t e ly e lu t ed w i t h 11ml or less of 2 M n i t r i c a c i d ; cobalt(II) is to ta l ly r e m o v e d b y 1 2 M h y d r o c h l o r i c ac id . A l l four an ion ic complexes c a n be left o n the c o l u m n for 7 d a n d s t i l l be quan t i t a t ive ly (99%) recovered . The technique is w e l l su i t ed for on-site w o r k .
