In this paper, a glassy carbon electrode (GCE) was modified with polyzincon. The modified electrode was used as a simple, inexpensive and highly sensitive electrochemical sensor for the determination of organophosphorus pesticide fenitrothion. To fabricate the electrochemical sensor, GCE was immersed in 0.10 mmol L⁻¹ zincon solutions at pH 7.0 and then successively scanned between −1.00 to 2.20 V (vs. Ag/AgCl) at a scan rate of 70 mV s⁻¹ for six cycles. The morphology and structure of the polyzincon were studied with atomic force microscopy and scanning electron microscopy. A comparison of the electrochemical behavior of fenitrothion on the unmodified and polyzincon modified‐GCE showed that in the modified electrode not only the oxidation peak current increased, but also the overpotential shifted to lower one. The experimental conditions such as sample solution pH, accumulation potential, and time were optimized. The differential pulse voltammetric responses of fenitrothion at potential about −0.60 V was used for the determination of fenitrothion. The peak current increased with increasing the concentration of fenitrothion in the range of 5 to 8600 nmol L⁻¹ with a detection limit of 1.5 nmol L⁻¹. Finally, the electrochemical sensor was used for the analysis of fenitrothion in water and fruit samples.

中文翻译：

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聚津康修饰玻碳电极电化学测定杀nitro灵有机磷农药

在本文中，玻碳电极（GCE）用多晶康改性。修饰的电极用作测定有机磷农药杀虫硫磷的简单，廉价且高度灵敏的电化学传感器。为了制造电化学传感器，将GCE浸入pH 7.0的0.10 mmol L ^-1锌溶液中，然后以70 mV s ^-1的扫描速率在-1.00至2.20 V（相对于Ag / AgCl）之间进行连续扫描六个周期。用原子力显微镜和扫描电子显微镜研究了聚锌康的形貌和结构。对非硫磷在未修饰的和聚锌康修饰的GCE上的电化学行为的比较表明，在修饰的电极中，不仅氧化峰电流增加，而且过电势也移至较低。优化了实验条件，例如样品溶液的pH，累积电位和时间。在约-0.60 V的电位下，杀nitro硫磷的差分脉冲伏安响应用于测定杀nitro硫磷。在5至8600 nmol L ^-1范围内，随着杀fe硫磷浓度的增加，峰值电流增加，检测极限为1.5 nmol L ^-1。最后，电化学传感器用于分析水中和水果样品中的杀nitro硫磷。