催化动力学光度法测定水中痕量锰

:20011206:(1963),,,.()付广云(临沂师范学院化学与环境科学系,山东临沂276005):在HAcNaAc介质中,以氨三乙酸(NTA)为活化剂,锰(I1)对于高碘酸钾氧化灿烂绿的反应具有强烈的催化作用.建立了催化动力学光度法测定痕量锰(II)的新方法.该方法的检出限为2.22!10-11g/mL,测定线性范围为012ng/mL.直接用于环境水样中锰的测定,结果满意.:催化动力学光度法;灿烂绿;锰;水:O657.3:A:1009-6051(2002)03-42-02,,;.[1-3],KIO4B,NTA,HAcNaAc,~KIO4~,,,.11.1753WB();501().():MnSO4∀H2O0.3080g100mL,1.0mg/mL,0.1g/mL.HAc~NaAc:pH=4.0;:0.5!10-3mol/L;:2.5!10-2mol/L;(NTA):5.0!10-3mol/L;:,.1.24.0mL50mL,(),(),2.0mL,NTA1.5mL,3.0mL,45mL,,,65#10min,1.0g,10min,1cm,=630nmA0A,∃A=AA0.1.2.1吸收光谱22.12.1.1吸收光谱,580670nmA,,630nm,A.Mn(II).630nm.2.1.2酸度的影响,HAc~NaAc,pH4.0,.2.1.3试剂用量的影响,4.0mL,:2.0mL,3.0mL,NTA1.5mL,A,.,4.0mL,pH4.02.0mL,3.0mL,NTA15mL.2.1.4温度的影响,,,65#,,65#,,24320026Vol.24No.3JournalofLinyiTeachers%CollegeJun.200265#,.650.5#.2.1.5反应时间的影响,,,510minA.,.10min.2.1.6体系稳定性,,6h,A,,10min.2.2,,(II)012ng/mL∃A,∃A=0.158CMn2+(g/45mL)-0.018r=0.9994,2.22!10-11g/mL.2.30.5g/45mL(),5%,10000Cu2+Zn2+F-C1-NH+4Ca2+Mg2+Cd2+Mo(VI)Cr(VI)CO2-3SiO2-3Co2+;2000Br-Pb2+Ni2+Cr3+;1000Hg2+Fe3+;200I-Sb3+;100S2O2-3;50Ag+Bi3+,.2.4[2,3],Mn(II),Mn(II),Mn(&).,:Mn2++IO-4Mn3++IO2-4Mn2++IO2-4Mn3++IO2-3Mn3++nAc-∋Mn(&)(Ac)n]3-n[Mn(&)(Ac)n]3-n+RMn2++R*R,R*.3,,1.1(n=6)(g/mL)(%)(g)(g/mL)(%)0.1243.563.003.155101.20.2302.733.003.19799.40.1943.183.003.225101.10.2652.643.003.19998.6:[1]().(3)[M];1989.185.[2]T!∀!H#H∃#%,C&eB∋#,(np)∗!.+.HeopeaH.,!−!!.,1982.27(10):2534.[3],.()[J].,1995,23(8):907.CatalyticKineticSpectrophotometricDeterminationofTraceManganeseinWaterFUGuangyun(DepartmentofChemistryandEnvironmentalScience,LinyiTeachers%College,LinyiShandong276005,China)Abstract:UsingNTAasanactivatingagent,Mn()cancatalyzereactionofbrillantgreenwithpotassiumperiodateinHAcNaAcbuffers.Basedonthis,anewspectrophotometricmethoddeterminingtracemanganesewasfounded.Thedetectionlimitis2.22!10-11g/mLandthelinearrangeformanganeseis012ng/mL.Themethodhasbeenusedfordeterminationoftracemanganeseinwaterwithsatisfactoryresults.Keywords:catalytickineticspectrophotometric;brillantgreen;manganese;water:433:()