Secondly, various mobile phases were examined to separate Cl− from chromium species by IC to avoid Cl− interference. The separation of [Cr(EDTA)]− and Cr(VI) was achieved on a new anion-exchange column (G3154A/102) using a mobile phase containing 20mM NH4NO3 and 10mM NH4H2PO4 at pH 7.0 without Cl− interference. Detection limits for chromium species were below 0.2 _g/L with a direct injection of sample and without prior removal of interferences from the matrix.