基于聚谷氨酸修饰玻碳电极的甲基对硫磷电化学传感器.pdf

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1、第3O卷第9期应用化学Vo1．3ONo．92013年9月CHINESEJ0URNALOFAPPLIEDCHEMISTRYSep．2013AMethylParathionElectrochemicalSensorBasedonPoly(glutamicacid)ModifiedGlassCarbonElectrodesLU0Qimei，LIZhen，WANGHuixian，LIUDengyou(ScienceCollegeofHunanAgriculturalUnive~ity，Changsha410128，China)AbstractAsimpleelectrochemical

2、sensorwasdevelopedfordetectingmethylparathion(MP)basedonelectropolymerizationofL—glutamicacidontheglassycarbonelectrode．TheredoxbehaviorofMPonthesensorwasinvestigatedbycyclicvohammetry，andthedeterminationofmethylparathionwasperformedwithdiferentialpulsevohammertry．Ahighlylinearcurrentrespons

3、etomethylparathionwasobtainedintheconcentrationrangefrom5．0×10一’to7．5×10一mol／L．Adetectionlimitof1．0×10一mol／Latasignal-to—noiseratioof3wasattained．Themethodcouldbeappliedtothedeterminationofmethylparathioninrealsamples．Keywordsmethylparathion，poly(glutamicacid)，electrochemicalsensor，electropo

4、lymerizationCLCnumber：0657．1Documentcode：AArticleID：1000-0518(2013)09·1082-07DOI：10．3724／SP．J．1095．2013．20549Methylparathion(MP)isoneoftheorganophosphoruspesticides(OPs)andhasbeenusedwidely．Ontheotherhand，OPscanbeeasilytransp0rtedbywindorwaterintoenvironment，andcontaminateecologicalcompartme

5、ntssuchaslakesandrivers引．Therefore，itisessentialtodevelopafast，simple，sensitive，andinexpensivemethodforthedeterminationofOPsinenvironmentalsamples．Manyanalyticalmethods．includinggasandliquidchromatographyhavebeenappliedtodetectOPsresidue．Theseanalyticalmethodshavethefeatureofhighsensitivitya

6、ndaccuracy，butrequiretedioussamplepreparationandlonganalysistimethatlimittheirapplicationforon—siteanalysis．TheelectrochemicalmethodhasbeenwidelyappliedtodetectOPsL6剖，becauseofitshighsensitivity，goodselectivity，fastresponsetimeandlow—costinstrumentation．Forexample，acetyleneblack—cbitosancomp

7、ositefilmmodifiedelectrodewasusedforthedetectionofOPsandthedetectionlimitwas2．0×10mol／L．Poly(glutamicacid)(PGA)modifiedelectrodehasbeenalsoreposedintheliteratureforfabfic~ingsensorsofcatechol㈨，L-tryptophan[]andamoxicillin[．However．ithasnotbeenutili