Abstract PEG-25 stabilized silver nanorods were synthesized and applied as a sensing probe for the colorimetric determination of sulfate in water. The PEG-25 stabilized silver nanorods were characterized by the UV–Vis absorption measurement and the transmission electron microscopy (TEM) analysis. Mixing the sensing probe (PEG-25 stabilized silver nanorods) and 10 μM SO42−, the silver nanorods aggregated and the color of solution was changed from ruby color to blackish blue color accordingly. The spectral shift of the sensing probe in the presence and absence of SO42− was monitored for SO42− quantification. Determination of SO42− revealed limit of detection (LOD) of 0.078 μM and 0.061 μM in deionized water and natural water, respectively. The comparative study revealed that the application of PEG-25 stabilized silver nanorods as sensing probe for SO42− exhibited an excellent sensitivity compared to other reported methods.

中文翻译：

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比色检测水中硫酸盐的银纳米棒的合成及应用

摘要 合成了 PEG-25 稳定的银纳米棒，并将其用作比色测定水中硫酸盐的传感探针。PEG-25 稳定的银纳米棒通过 UV-Vis 吸收测量和透射电子显微镜 (TEM) 分析进行表征。将传感探针（PEG-25 稳定的银纳米棒）和 10 μM SO42− 混合，银纳米棒聚集，溶液的颜色相应地从红宝石色变为黑蓝色。在 SO42- 存在和不存在的情况下，监测传感探针的光谱位移以进行 SO42- 量化。SO42− 的测定显示去离子水和天然水中的检测限 (LOD) 分别为 0.078 μM 和 0.061 μM。