Instrumental Neutron Activation Analysis of Total Halogen and Extractable Organohalogen in Fish Samples from the Densu Basin

摘要

ABSTRACT Instrumental Neutron Activation Analysis (INAA) has been validated and the method applied to determine total halogen and extractable organohalogen in six fish species namely Heterotis niloticus, Channa obscura, Hepsetus odoe, Tilapia zilli, Clarias gariepinus, and Chrysichthys nigrodigitatus. The samples were collected directly from the fishermen at their landing sites from the two sampling towns, ? Weija and Nsawam along the Densu river basin in the Greater Accra Region of Ghana. The concentrations of total chlorine, bromine, and iodine analysed by INAA were between 770.70 - 1123.50 mg/kg, 8.00 - 25.00 mg/kg and 0.70 - 4.20 mg/kg respectively. ? For the extractable organohalogens concentrations ranged from 0.30 – 350.40 mg/kg. The highest concentration of 350.40 mg/kg was obtained for extractable organochlorine (EOCl) in Hepsetus odoe sampled from Nsawam , while the lowest concentration was obtained for extractable organoiodine. The content of extractable organohalogen were in the order of EOCl EOBr > EOI. ? Key words: Neutron activation, Organohalogen, Fish species, Densu ? basin, Extractable.