Application of immobilized metal cations on the topside of gold-5-amino-2-mercaptobenzimidazole self-assembled monolayer (Au-5A2MBI-Mⁿ⁺ SAM, Mⁿ⁺:Cu²⁺ or Ag⁺) for electrocatalytic determination of hydroquinone (H₂Q) is described by voltammetric method. Several parameters were investigated to evaluate the performance of the sensors. Calibration curves for H₂Q concentrations were linear from 1.0 × 10^-5 to 4.0 × 10^-4 M (r = 0.998) for Au-5A2MBI, from 1.0 × 10^-5 to 6.0 × 10^-4 M (r = 0.998) for Au-5A2MBI-Cu²⁺, and from 2.0 × 10^-6 to 2.0 × 10^-5 M (r = 0.996) and 1.0 × 10^-4 to 1.0 × 10^-3 M (r = 0.991) for Au-5A2MBI-Ag⁺ SAM modified electrode. The respective detection limits were found as 6.5 × 10^-6, 4.6 × 10^-6 and 1.8 × 10^-7 M. Both Cu²⁺ and Ag⁺ ions were found to have a good electrocatalytic effect on the oxidation of H₂Q; however, Ag⁺ was a more effective catalyst and showed better sensitivity and lower detection limit than all other tested electrodes. Au-5A2MBI-Ag⁺ SAM electrode was used as a suitable sensor for determination of H₂Q in a radiolysis developing agent as real sample. The results obtained by using proposed sensor and that obtained by an ASTM reference method were in good agreement at the 95% confidence level.

中文翻译：

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M n +修饰的金-5-氨基-2-巯基苯并咪唑自组装单层电极电催化测定对苯二酚

固定化金属阳离子在金5-氨基2-巯基苯并咪唑自组装单分子膜上（Au-5A2MBI-M ^{n +} SAM，M ^{n +}：Cu ²⁺或Ag ⁺）的表面上用于电催化测定对苯二酚（H ₂ Q ）是通过伏安法描述的。研究了几个参数以评估传感器的性能。对于Au-5A2MBI，H ₂ Q浓度的校准曲线从1.0×10 ^-5到4.0×10 ^-4 M（r = 0.998）呈线性，从1.0×10 ^-5到6.0×10 ^-4 M（r = 0.998）适用于Au-5A2MBI-Cu ²⁺和2.0×10 ^-6对于Au-5A2MBI-Ag ⁺ SAM修饰电极，最大为2.0×10 ^-5 M（r = 0.996）和1.0×10 ^-4至1.0×10 ^-3 M（r = 0.991）。各自的检测限，发现为6.5×10 ^-6，4.6×10 ^-6和1.8×10 ^-7 M.两者的Cu ²⁺和Ag ⁺被发现离子对H的氧化良好的电效果₂ Q; 然而，Ag ⁺是一种更有效的催化剂，与所有其他测试电极相比，具有更高的灵敏度和更低的检测限。使用Au-5A2MBI-Ag ⁺ SAM电极作为测定H ₂的合适传感器放射线显影剂中的Q作为真实样品。通过使用建议的传感器获得的结果和通过ASTM参考方法获得的结果在95％的置信度水平上非常吻合。