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:1009-3818(2001)02-0065-02Cr6+(421000):,,Cr6+3:2,540nm,4104Lmol-1cm-1,0.004mgL-11.000mgL-1,=0.9969,Cr6+:;;Cr6+:O654.1:A[1],,;,(100),,,5mg/L170mg/L,,[26],(DPC),,,,,Cr6+,11.1(1)722()(2)(AR),(1:1),(1:1),(1:1),(),DPC(AR),:2000-03-07:31(AR),,(10g/mL);(0.1g/mL):(2%DPC-),0.2%1.250mL,,0.5mL(1:1)0.5mL(1:1),DPC3.0mL,,510min,540nm,30mm,,(),2,,,11Cr6+Cr6+PmLPgPgP%RSDP%500.01123-1.5750.10.11097.650.20.216104.81000.03303-1.32100.10.133100.0100.20.23299.03:n=633.1(520565nm),,540nm540nm3.2,0.40.6mL,,132()Vol.13No.220016JournalofChangdeTeachersUniversity(NaturalScienceEdition)Jun.2001,,(1:1)0.5mL3.350mLDPC,,,2.04.0mL,3.0mL3.4,Cr6+,5min,30min,510min3.53:23.6,Cr6+0.004mg/L1.000mg/L,,:A=2.000C+1.82510-3(=0.9969);ACr6+,CCr6+3.723,:SO42-(200),Na+K+Ca2+Ni2+Co2+Mg2+(1000),Cl-Br-(500),Cd2+Ag+Zn2+Mo()(200),As3+Pb2+NO3-(100),NH4+(30),Mn6+I-(25),Bi3+(20),Sb3+(10),Al3+(5),Fe3+(2)Sb3+Al3+Fe3+,,Sn2+Hg2+Cu2+,5%,,Cr6+,;Cr6+,,1.[M].:,1982:284.2..,1998(1):26.3,.(VI).,1996,24(2):164.4.Cr(VI).,1998,12(2):65.5.(VI)3,3,5,5-[J].,1997,25(6):742.6,.-[J].,1996,12(2):129.STUDYONAPPLYINGDIPHENY-LCARBONYDRAZIDEINTODETECTINGCr6+INWATERXIEHu-linYANGHua-lin(HunanBuildingMaterialsCollege,HengyangHunan,421008)AbstractThereactionofDiphenylcarbonydraidewithCr6+inwaterwasstudied.Inamediumofbrimstoneacid,Cr6+reactswithDiphenylcarbonydratidetoformastable3:2chelate,withanappar2entmolarabsorptivityof=4104Lmol-1cm-1at540nm.Beerslawisobeyedintherangeof0.0041.000mgL-1,andthecorrelationcoefficientis0.9969.Thebestconditionsofspectropho2tometrywerestudiedincludingacidmedium,acidity,reagentquanti2ty,colortime,thestabilityofcoloredcom-plexandthedisturbancesofotherionstoCr6+.ThismethodwasappliedtothedetectionofCr6+inwater.Keywordsdisphenylcarbonydraaide;spectrophotometry;Cr6+(:)66()2001