目的 基于改性罗丹明B(RhB)可聚合单体，制备了Fe³⁺、pH和温度响应的聚丙烯酰胺水凝胶，用于包装材料中水溶性痕量Fe³⁺的测定。方法 以RhB改性的甲基丙烯酰胺罗丹明B(RhBMA)，与丙烯酰胺(AAM)交联制备了罗丹明功能化聚丙烯酰胺水凝胶P(AAM-co-RhBMA)。通过紫外-可见吸收光谱(UV-Vis)和荧光光谱(FS)分别测定了水凝胶对Fe³⁺的吸收，并探讨了凝胶的pH和温度响应行为。结果 聚合物水凝胶对Fe³⁺有较高的选择性，且对Fe³⁺吸收在质量分数为10×10^–6~100×10^–6保持良好的线性关系(R²=0.997);将聚合物水凝胶交替浸入Fe³⁺和乙二胺(EDA)溶液中，其颜色可逆变化。聚合物水凝胶在pH=3.4和pH=11.3间可实现颜色的可逆转变。在室温升到50 ℃的过程中，凝胶从粉红色逐步变成无色。结论 成功制备了Fe³⁺、pH和温度响应的含罗丹明B的聚丙烯酰胺，该聚合物水凝胶可潜在应用于包装体系中水溶性Fe³⁺痕量检测。

The work aims to prepare a polymeric hydrogel endowed with Fe3+, pH and temperature stimulus responses based on modified Rhodamine B(RhB) moiety for detecting trace amount of Fe3+ detection in packaging materials. Rhodamine functionalized polyacrylamide hydrogel P(AAm-Co-RHBMA) was prepared with RhB modified methyl acrylamide Rhodamine B(RhBMA) and acrylamide (AAM). The absorption of Fe3+ by hydrogel was measured by ultraviolet visible (UV-Vis) and fluorescence spectroscopy (FS), and the pH and temperature responses of the gel were investigated. The polymer hydrogels had high selectivity for Fe3+, and the absorption of Fe3+ maintained a good linear relationship between 10 × 10–6 and 100 × 10–6 (R2=0.997). When the polymer hydrogels were alternately immersed in Fe3+ and ethylenediamine (EDA) aqueous solution, its color changed reversibly. Polymer hydrogels could achieve reversible color transformation between pH=3.4 and pH=11.3. At room temperature to 50 ℃, the gel gradually changed from pink to colorless. In conclusion, Fe3+, pH and temperature responsive polyacrylamide containing Rhodamine B is successfully prepared, and the polymer hydrogel has potential application in Fe3+ trace amount detection in the packaging system.