The　ability　of　phenols　to　quench　the　chemiluminescence　of　p-chlorobenzenediazonium　fluoroborate　in　a　medium　of　alkaline　hydrogen　peroxide　was　studied,　and　a　flow　injection　chemiluminescent　quench　method　for　the　determination　of　volatile　phenols　in　polluted　water　was　established.　The　linear　calibration　ranges　are　0-6.0,　0-5.0,　0-4.5　and　0-8.0　μg　ml-1　and　the　detection　limits　are　0.015,　0.020,　0.025　and　0.030　μg　ml-1　for　phenol,　o-nitrophenol,　p-cresol　and　2,4-xylenol,　respectively.　This　method　is　more　sensitive　than　the　4-aminoantipyrine　direct　spectrophotometric　method　and　the　flow　injection　spectrophotometric　method.　The　relative　standard　deviation　is　3.0%　for　1　μg　ml-1　phenol.