Abstract The complex relative permittivity study of samples of liberdux® syrup dissolved in distilled–deionized water is presented. It should be mentioned that excess of this syrup as pharmaceutical residual in water is considered an emerging contaminant. The study covers liberdux® concentrations from 0% v/v to 100% v/v, which were measured from 500 MHz to 20 GHz. For each sample, the parameters of the Havriliak–Negami model are presented in the range of measurement. Also, the uncertainty study was carried out to determine the sensitivity of the open coaxial probe and it was established that, for concentrations between 8% v/v and 100% v/v, it is possible to determine the concentration of liberdux® in water by the dielectric constant and the loss factor. In addition, a linear relationship was found between the concentration of liberdux® and the α parameter of the Havriliak–Negami model. The study of liberdux® concentrations was also performed with a spectrophotometer and the Beer–Lambert equation. It was established that the spectrophotometer and the open coaxial probe can be used as complements to measure concentrations, the spectrophotometer being the instrument for measuring low concentrations by absorbance, and the open coaxial probe for high concentrations by microwave permittivity.

中文翻译：

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通过微波范围内的介电特性检测水中新出现的污染物

摘要 介绍了溶解在蒸馏-去离子水中的 liberdux® 糖浆样品的复杂相对介电常数研究。应该提到的是，过量的这种糖浆作为水中的药物残留物被认为是一种新出现的污染物。该研究涵盖了从 0% v/v 到 100% v/v 的 liberdux® 浓度，在 500 MHz 到 20 GHz 范围内测量。对于每个样本，Havriliak-Negami 模型的参数都显示在测量范围内。此外，还进行了不确定性研究以确定开放式同轴探头的灵敏度，并确定，对于 8% v/v 和 100% v/v 之间的浓度，可以确定水中的 liberdux® 浓度由介电常数和损耗因子决定。此外，发现 liberdux® 的浓度与 Havriliak-Negami 模型的 α 参数之间存在线性关系。还使用分光光度计和 Beer-Lambert 方程对 liberdux® 浓度进行了研究。确定了分光光度计和开放式同轴探头可以作为测量浓度的补充，分光光度计是通过吸光度测量低浓度的仪器，而开放式同轴探头通过微波介电常数测量高浓度。