Abstract

In this study, a selective and easy colorimetric probe was developed for the detection of silver ions. This system relied on the aggregation of gold nanoparticles (AuNPs) with ammonium pyrrolidine dithiocarbamate (APDC) and its anti-aggregation in the presence of silver ions. APDC caused the aggregation of AuNPs which resulted in color change from red to blue. However, in the presence of silver ions, because of their ability to complex with APDC, the aggregation of AuNPs was inhibited and color change occurred in the opposite direction by increasing Ag⁺ concentration (blue to red). Under optimum conditions, this system exhibited high selectivity to Ag⁺ over other tested metal ions. This novel probe had advantages such as wide linear range (0.05–0.9 µM) and low detection limit (20 nM). The recovery analysis of river water as real sample confirmed that the proposed colorimetric sensor could be successfully employed in the determination of Ag⁺ in real water samples.

中文翻译：

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吡咯烷二硫代氨基甲酸铵存在下的无标记金纳米粒子作为选择性和敏感性的银离子比色探针

摘要

在这项研究中，开发了一种选择性和简便的比色探针，用于检测银离子。该系统依赖于吡咯烷二硫代氨基甲酸铵（APDC）与金纳米颗粒（AuNPs）的聚集及其在银离子存在下的抗聚集作用。APDC导致AuNPs聚集，从而导致颜色从红色变为蓝色。但是，在存在银离子的情况下，由于其与APDC络合的能力，AuNP的聚集受到抑制，并且通过增加Ag ⁺浓度（蓝色至红色）在相反方向上发生了颜色变化。在最佳条件下，该系统对Ag ⁺具有很高的选择性超过其他经过测试的金属离子。这种新型探针具有线性范围宽（0.05–0.9 µM）和检测限低（20 nM）等优点。对实际水样中的河水进行回收率分析证实，该比色传感器可成功用于实际水样中Ag ^+的测定。