Abstract：The poly(L-threonine) modified glassy carbon electrode was prepared by cyclic voltammetry in NaAc-HAc buffer solution at pH 3.5. The square wave anodic stripping voltage current characteristics of Pb2+ on modified electrode were investigated. The determination method of Pb2+ by square wave anodic stripping voltammetry was established. Under the optimal experimental conditions, the concentration of Pb2+ in range of 5.00×10-8- 7.50×10-6 mol/L showed good linearity to the peak current. The detection limit was 5.0×10-9 mol/L. The tolerant amount of co-existing ions for 2.50×10-6 mol/L of Pb2+ was defined as resulting in error of ±5%, and was listed as following (in fold): K+, Na+, SO2-4, PO3-4, NO-3, Cl-, Ca2+, Ba2+, Mn2+, Mg2+, Al3+, Zn2+, Fe3+, Cr3+, Co2+, Cd2+ (at least 1 000); Cu2+ (200). The content of trace lead in two waste water samples was determined according to the experimental method, and the relative standard deviation (RSD, n=6) of results was 1.4% and 2.4%, respectively. The recovery was 99% and 103%, respectively.
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