A measured sample volume of approximately 100 mL is adjusted to pH 12 with 6 N sodium hydroxide, shaken, and allowed to set for 1 hr to hydrolyze chlorinated esters. The sample is acidified with H3PO4, filtered, and the chlorinated acids are extracted from a 25 ml aliquot. The 20-mL aliquot is pumped through an HPLC cartridge (containing C18 -silica) trapping the chlorinated acids. The concentrator cartridge is valved in-line with the Cl8 analytical column following extraction. The analytes are separated and measured by photodiode array-ultraviolet detection (PDA-UV). NOTE: A liquid-solid extraction disk is perfectly acceptable for use in the in-line extraction of the analytes providing all quality control (QC) criteria are met or exceeded.