CAJ | 학술논문

本实验制备了羧基化的氧化石墨烯，并将其修饰在玻碳电极（ GCE）表面制备了羧基化石墨烯/玻碳电极（ GO-COOH/GCE），以此为工作电极研究了镉在GO-COOH/GCE上的电化学行为及测定方法。与裸玻碳电极（ GCE）相比，GO-COOH膜修饰玻碳电极能显著加强镉的氧化还原峰电流。在pH＝4.5的NaAc-HAc缓冲溶液中，镉在GO-COOH/GCE电极上出现1组氧化还原峰，Epa＝-0.81 V，Epc＝-0.93 V，△E＝0.12 V；ipa＝8.04μA，ipc＝8.54μA，ipa/ipc＝0.94。氧化峰电流与Cd2＋浓度在5.5×10-7～7.5×10-6 g· L-1（r＝0.9969）范围内呈良好的线性关系，检出限为2.0×10-7 g· L-1。实际样品测定的RSD 为1.2％（n＝5），平均回收率为101.3％。 GO-COOH膜对镉的电化学氧化有明显的催化作用，本法是一种可靠、快捷、灵敏的检测方法，可以用于保健品螺旋藻药片中镉含量的测定。
본실험제비료최기화적양화석묵희，병장기수식재파탄전겁（ GCE）표면제비료최기화석묵희/파탄전겁（ GO-COOH/GCE），이차위공작전겁연구료력재GO-COOH/GCE상적전화학행위급측정방법。여라파탄전겁（ GCE）상비，GO-COOH막수식파탄전겁능현저가강력적양화환원봉전류。재pH＝4.5적NaAc-HAc완충용액중，력재GO-COOH/GCE전겁상출현1조양화환원봉，Epa＝-0.81 V，Epc＝-0.93 V，△E＝0.12 V；ipa＝8.04μA，ipc＝8.54μA，ipa/ipc＝0.94。양화봉전류여Cd2＋농도재5.5×10-7～7.5×10-6 g· L-1（r＝0.9969）범위내정량호적선성관계，검출한위2.0×10-7 g· L-1。실제양품측정적RSD 위1.2％（n＝5），평균회수솔위101.3％。 GO-COOH막대력적전화학양화유명현적최화작용，본법시일충가고、쾌첩、령민적검측방법，가이용우보건품라선조약편중력함량적측정。
We synthesized the carbonylated graphene ,which was used to modify glassy carbon electrode surface to prepare carbony-lated graphene modified glassy carbon electrode ( GO-COOH/GCE) .And the electrochemical behavior on the electrode was investi-gated.The oxidation peak current of cadmium increased remarkably at the GO-COOH/GCE in contrast to that at the bare GCE .One pair of redox peaks of cadmium at GO-COOH/GCE are obtained by cyclic voltammetry in NaAc-HAc buffer solution ( pH=4.5 ) . Epa=-0.81 V,Epc=-0.93 V,△E=0.12 V;ipa=8.04 μA,ipc=8.54 μA,ipa/ipc=0.94.A sensitive and convenient(differential pulse voltammetry ,DPV) analysis method of cadmium was established based on the electrochemical behavior .The oxidiztion peak is linearly related to the concentration of cadmium in the range of 5.5 ×10-7 to 7.5 ×10-6 g· L-1 ( r=0.9969 ) with a detection limit of 2.0 ×10-7 g· L-1 ,the RSD for cadmium was 1.2%( n=5 ) and an average recovery rate of 101.3%was achieved .The GO-COOH/GCE exhibits catalytic activity to the oxidation of cadmium .The proposed method was used to determine the concentration of cadmi-um in spirulina tablets .