Sorption of some trace metal ions (Fe, Ni, Cu, Zn, Cd, Co) after complexation with sodium diethyl dithiocarbamate (Na-DDTC) on Amberlite XAD-16 was investigated in the pH range 2-10. All these metals were retained from pH 3 to 6. The retained metals can be eluted with various eluting agent such as 1 M nitric acid in acetone, 3 M nitric acid in ethanol. The method was applied to trace metal ions in surface sea water samples from Mersin Bay (Mediterranean Sea), Turkey. The relative standard deviations of the determination were less than 8%.