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The efficiency of depuration in the removal of heavy metals in Periwinkle (Tympanatonus fuscastus) was evaluated in this study. Periwinkle in depuration tanks were taken at intervals of 24, 48, 72 and 96 hours of depuration and analyzed for these heavy metals: Lead (Pb), Zinc (Zn), Chromium (Cr) and Cadmium (Cd). Results from the analyses shows that time, method and season has significant effect on heavy metals. At different location, there was significant difference at different time interval of depuration for both seasons. The control for all the locations had the highest count for depuration at both seasons. The concentration of Pb, Cr, Cd and Zn for depurated periwinkle at 24-96 hours was significantly different (P |
