A convenient and sensitive spectrometric system based on a liquid core optical fiber and a charge coupled device was constructed for the determination of chromium（VI） in river water.Diphenylcarbazide was added to Cr（VI） solution to form colored complex in the medium of perchloric acid.With a 35 cm long Teflon optical fiber,the limit of detection（LOD） was 0.4 μg·L-1,ten times lower than that of Chinese National Standard Procedure（GB7467-87）.The method was applied to determine Cr（VI） in river water without any preconcentration.The recovery was 99%～107%.
