简介：Inthepresenceofmixedmicelleofacationicandanonionicsurfactants,thereactionofscandium（Ⅲ）withphenylfluoroneoritsderivativesresultsinaverysensitivecolouration:furthermorethischromophoricsystemtoleratestheexistenceofaconsiderableamountofmaskingagents,sothatmanyinterferingionscanbemaskedanditsselectivitywouldbefurtherimproved.Afterstudyingtheoptimumconditionsandmaincharac-tersofsomesimilarsystems,thesystemofSc（Ⅲ）—Orthonitrophenyuorone—CetyltrimethylammoniumBromide（CTMAB）—TritonX-200ischosenforthespectrophotometricdeterminationofmicroamountofscandium.Theproposedmethodshowsnotonlyhighsensitivity(withamolarabsorptivityof2.12×1sLmol-1·cm-1)andselectivity,butalsohightoleranceofchromophoricconditions.Beer’slawisobeyedoverarangeof0～6.0μgSc/25ml.Ifthedual-wavelengthmethodisapplied,amuchhighermolarabsorptivityo|"3.04×105L·mol-1·cm-1thanthoseofothersystemseverreportedintheliteraturescanbeattained:more-over.itslinearrangeisextendedto0～8.0μgSc/25mlanditsreproducibilityisalsoimproved.