The selenium content of Turkish diets was determined by Zeeman effect graphite furnace atomic absorption spectrometry (GFAAS). Samples, collected from two different socioeconomic groups by duplicate portion technique, were digested with concentrated nitric acid in acid bombs, and hydrogen peroxide was added for complete oxidation. The digested solutions were then analyzed by GFAAS with the nickel chemical modifier addition. The detection limit for Se(VI) was 10.5 ng/mL for aqueous standard solutions. Average selenium concentrations of 0.069 +/- 0.030 and 0.113 +/- 0.036 mg/kg were obtained for the rural population group LALAHAN (n = 6) and for the urban population group METU (n = 10) samples, respectively. Daily dietary intakes of selenium were found as 23 +/- 13-mu-g/day for LALAHAN subjects and 57 +/- 31-mu-g/day for the urban population group (METU). The selenium intake for the first group is lower than the range of safe and adequate intake value, 50-200-mu-g/day, while that of the second group is just within the range.