Abstract:The L-cysteine-grapheme-L-aspartic acid nanocomposite film was used to prepare novel electrochemical sensor for Pb2+, realizing the sensitive determination of lead in environmental water sample. Firstly, the L-cysteine-graphene modified glassy carbon electrode was prepared by graphene and L-cysteine via electro-polymerization. Then, L-aspartic acid-L-cysteine-graphene modified glassy carbon electrode was prepared by grafting L-aspartic into the L-cysteine-graphene modified glassy carbon electrode via covalent bonding using glutaraldehyde. Since the good selectivity of L-aspartic acid and good conductivity property of graphene, the signal response and selectivity of sensor to Pb2+ were improved. The testing results showed that, 10-fold of Cu2+, Ca2+, Co2+, Cd2+, Mn2+, Zn2+, Ni2+ and Hg2+ had no interference with the determination of 1×10-7 mol/L Pb2+ (the change of peak current was less than 5 %). In acetate buffer solution at pH4.5, the concentration of Pb2+ showed good linearity to the peak current. The linear range was 2.0×10-9-6.0×10-6 mol/L, and the detection limit was 6.0×10-10 mol/L (S/N=3). The modified electrode was applied to the determination of lead in environmental water sample. The determination results were consistent with those obtained by ICP-AES.
王玲玲,刘雪,余萌. L-天冬氨酸-L-半胱氨酸-石墨烯修饰玻碳电极测定铅的研究[J]. 冶金分析, 2013, 33(8): 6-11.
WANG Ling-ling, LIU Xue, YU Meng. Study on determination of lead by L-aspartic acid-L-cysteine-graphene modified glassy carbon electrode. , 2013, 33(8): 6-11.
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