DETERMINATION OF METALS PRESENT IN MAKE-UP SHADOWS BY UV-VIS SPECTROPHOTOMETRY: A CONTEXTUAL EXPERIMENT IN HIGHER EDUCATION

Metallic oxides are used in cosmetic shadows formulations in order to highlight the area around the eyes, with different colors. Due to the close proximity to the eye mucosa, these products are a potential source of metal intoxication in human body. Based in this fact, several analytical methods to quantify metals in cosmetic shadows have been proposed in the literature. This paper, propose a contextual experiment to investigated the presence of Al3+, Fe3+ and Cu2+ using UV-VIS spectrophotometric and complexation reactions in solvent mixtures to generate cromophore species. These experiments have the potential to insert a contextual discussion in chemistry and pharmaceutical graduation courses, making a meaningful experimentation in the formative attribute of these courses.

金属氧化物常被应用于多色眼部眼影的配方体系中，用于提亮眼周区域。由于此类产品与眼黏膜距离极近，因此存在引发人体金属中毒的潜在风险。基于这一现状，现有文献已提出多种用于定量分析眼影中金属含量的分析方法。
本研究设计了一项情境化实验，采用紫外-可见分光光度法（UV-VIS）结合混合溶剂中的络合反应生成生色团（chromophore），以检测Al³+、Fe³+及Cu²+的存在情况。该实验可融入化学与药学本科毕业课程的情境化教学环节，为这类课程的能力培养目标提供兼具实践意义的教学内容。