Abstract

Bare boron-doped diamond electrode (BDDE) was applied for investigation of deposition/stripping processes of silver ions in various supporting electrolytes. The highest signal was observed in 0.1 mol dm⁻³ HNO₃. Detection of silver ions is also possible in 0.1 mol dm⁻³ Na₂S₂O₃ where Ag⁺ is strongly complexed as [Ag(S₂O₃)₂]³⁻. Though the sensitivity is 100 times lower, the potential of anodic dissolution of silver is significantly shifted towards the negative values. This shift might be useful for solving of some interferences which may occur in the detection process. After preliminary cyclic voltammetry, the analytical performance was studied by differential pulse anodic stripping voltammetry (DPASV) and square-wave anodic stripping voltammetry. Deposition potential of − 0.18 V vs. Ag/AgCl and deposition time of 240 s were selected as optimum DPASV parameters. The lowest detection limit of 2.0 × 10^–10 mol dm⁻³ was achieved with DPASV in HNO₃. Negligible effect of possible interferents on Ag response proved to be a good selectivity of method. The proposed method after validation was also applied to real samples analysis of some commercial products with complex matrix. The obtained results are statistically identical with data declared by manufacturer and gained by independent technique, making this method suitable for commercial product control.

Graphic abstract

中文翻译：

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伏安法检测掺硼金刚石电极上商业产品中的银：在硫代硫酸根离子存在下以较低电势剥离

摘要

裸硼掺杂金刚石电极（BDDE）用于研究各种支持电解质中银离子的沉积/剥离过程。在0.1 mol dm ^-3 HNO _3中观察到最高信号。还可以在0.1 mol dm ^-3 Na ₂ S ₂ O ₃中检测银离子，其中Ag ⁺与[Ag（S ₂ O ₃）₂ ] ^3-。尽管灵敏度降低了100倍，但银的阳极溶解潜能却显着向负值转移。此偏移对于解决检测过程中可能发生的某些干扰可能很有用。经过初步的循环伏安法后，通过差分脉冲阳极溶出伏安法（DPASV）和方波阳极溶出伏安法研究了分析性能。相对于Ag / AgCl，沉积电位为− 0.18 V，沉积时间为240 s，作为最佳DPASV参数。在HNO _3中使用DPASV达到了最低检测限2.0×10 ^–10  mol dm ^-3。可能的干扰物对Ag反应的影响可忽略不计，证明了该方法具有很好的选择性。验证后提出的方法也可用于一些复杂基质商品的真实样品分析。获得的结果与制造商声明的数据和通过独立技术获得的数据在统计上相同，从而使该方法适用于商业产品控制。

图形摘要