Nickel, lead. cadmium, copper, cobalt, manganese and iron contents of the river water samples from Gelingulu Dam, Karasu, Kanak Suyu and Delice River (Yozgat-Turkey) have been determined by flame and / or graphite furnace atomic absorption spectrometry after preconcentration by sorbing the metal / ammonium pyrrolydine dithiocarbamate (APDC) complexes on the activated carbon column. The concentration ranges of nickel, lead, cadmium, copper, manganese and iron were <1-5.0 mu g/l, 2.6-29.8 mu g/l, 2.2-9.4 mu g/l, 1.6-13.4 mu g/l, 13.8-47.2 mu g/l and 33.4-284.4 mu g/l, respectively. The contents of cobalt of all water samples were found to be less than 1 mu g/l. Trace metal concentrations in the river water samples from Yozgat-Turkey were found within the standard limits by the Water Pollution Control Regulation of Turkish Authorities.