Sử dụng điện cực platin nano hình hoa biến tính trên bề mặt điện cực glassy cacbon để xác định Chì bằng phương pháp Von – Ampe hòa tan anot

Abstract

Lead (II) was determined by anodic stripping voltammetric method using platinum nanoflowers modified glassy carbon electrode (PtNFs/GCE). Optimal experimental conditions were found acetate buffer solution 0.1 mol.L^-1 (pH = 4.5), an preconcentration potential of -1.1 V, preconcentration time  of 120 s, pulse amplitude of 60 mV and scan rate of 0.23 V.s^-1. The peak current response increased linearly with the metal concentration in a range of 1-100 µg.L^-1 with R = 0.9981. The limit of detection and limit of quantity were 0.398 µg.L^-1 and 1.272 µg.L^-1, respectively.  The interference effects of some metal ions such as Zn, Cd, and Cu were studied. The PtNFs/GCE was applied to analysis of lead (II) in some river water, and lake water samples with results in satisfactory statistical agreement with graphite furnace atomic absorption spectroscopy (GFAAS).