ABSTRACT
A h m e d et al. [1] inves t iga ted the p r ec i s i on a n d accuracy of in f ra red spec t roscop ic m e t h o d s for d e t e r m i n i n g o i l i n seawater u s i n g t w o t e chn iques o f o i l p r e c o n c e n t r a t i o n , n a m e l y c a r b o n t e t r a c h l o r i d e ex t rac t ion a n d po lyu re thane f o a m adso rp t ion . T h e f o a m a d s o r p t i o n m e t h o d of Scha tzberg a n d Jackson [2] w a s used . Es tua ry wa te r (10-15L) w a s passed t h r o u g h a f o a m d isc (8cm diameter , 4 c m th ick , 100 pores i n _ 1 ) a n d then the re ta ined o i l w a s ext racted i n a Soxhle t appara tus w i t h ca rbon te t rachlor ide . T h i s extract w a s m e a s u r e d as de sc r ibed above . It w a s necessary to c lean n e w discs b y Soxhle t ex t rac t ion w i t h c a r b o n te t rachlor ide for 4 - 6 h to reduce b l a n k analys is to acceptable levels . Recover ies of k n o w n concentra t ions of o i l were greater t h a n 8 5 % for those concent ra t ions above 5 m g L - 1 .
