Abstract A Bausch & Lomb-ARL Model 34000 simultaneous inductively coupled plasma (ICP) emission spectrometer was interfaced with a high pressure liquid chromatograph to serve as a multi-element-specific detector. The standard ARL software was modified and a new program written to allow the chromatogram to be displayed graphically on-line. The HPLC-ICP system performance was demonstrated by the separation of arsenite, arsenate, methylarsonic acid, dimethylarsinic acid, phenylarsonic acid, selenite, and phosphate on a reverse-phase column. The detection limit for arsenic is 130 μg l −1 at 100 μl injection volumes. The arsenic signals are not dependent on the nature of the arsenic compounds. This HPLC-ICP system allows the quantitative determination of compounds with similar retention times provided they contain different elements determinable by ICP-AES.