锰(Ⅱ)-OP-5-Br-PADAP极谱络合吸附波研究  

Polarographic Adsorptive Wave Characteristics of Manganese-2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol-Octyl Polyethylene Glycol Phenyl Ether(5-Br-PADAP-OP) Complex

作　　者：杜芳艳[1] 邓保炜[1] 张亚[1] 刘小艳[1] 

机构地区：[1]榆林学院化学与化工学院,陕西榆林719000

出　　处：《食品科学》2011年第16期295-299,共5页Food Science

基　　金：陕西省教育厅项目(2010JK925);陕西省科技厅项目(2010JM2017);榆林学院重点项目(10GK02)

摘　　要：建立简便、快速的锰的极谱分析法,采用线性扫描极谱法对锰-2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)-聚乙二醇辛基苯基醚(OP)体系进行研究。结果表明:在Na2B4O7-NaOH(pH11.0)缓冲溶液中,锰-2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)-聚乙二醇辛基苯基醚(OP)络合物在-0.73V(vs.SCE)左右产生一灵敏的吸附波,该波的二阶导数峰峰电流在0.10～0.32μg/mL范围内与锰质量浓度呈线性关系(r=0.9989,n=10)。检出限为0.05μg/mL。经多种电化学方法证明该波为络合物吸附波,其电极过程为不可逆过程,电子转移数为2,此外还验证了多种离子对峰电流Ip''的影响。所拟方法用于大米中锰含量的测定,回收率在94.1%～101.0%之间,相对标准偏差为1.9%。In order to establish a simple and rapid method for the polarographic analysis of manganese,manganese-2-（5-bromo-2-pyridylazo）-5-diethylaminophenol（5-Br-PADAP）-octyl polyethylene glycol phenyl ether（OP） system was studied by linear sweep polarography.The results showed that in Na2B4O7-NaOH（pH 11.0） buffer solution,manganese-2-（5-bromo-2-pyridylazo）-5-diethylaminophenol（5-Br-PADAP）-octyl polyethylene glycol phenyl ether（OP） complex at-0.73 V（vs.SCE） could produce a sensitive adsorption wave.The second-order derivative peak current of the wave revealed a linear relationship with manganese over the concentration range of 0.10-0.32μg/mL（r = 0.9989,n = 10）.The detection limit was 0.05μg/mL.Meanwhile,this adsorption wave was an irreversible electrode process,which could be verified by various electrochemical methods.The electron transfer number was 2 and the effects of ions on peak current were also validated.This proposed method was used for the determination of manganese content in rice with a recovery rate ranging from 94.1% to 101.0% and a relative standard deviation of 1.9%.

关 键 词：锰 吸附波 2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP) 聚乙二醇辛基苯基醚(OP) 

分 类 号：O657.14[理学—分析化学]