Abstract In this study, a novel poly (SMIm)-Tris-Fe3O4 nanocomposite was prepared for selective extraction of Cu+ and Cu2+ ions by ultrasound assisted-cloud point extraction (UA-CPE). The nanocomposite was characterized by analysis of ATR-FT-IR, 1H NMR and XRD. After optimization of the extraction conditions, the copper ions were independently detected against sample blank at 347 nm by micro-volume UV–vis spectrophotometer. Under the optimal conditions, good linear relationship was obtained in the ranges of 0.3−150 and 10−350 μg L−1 for each ion at pH 7.0 and pH 5.0, respectively, with a better regression coefficient than 0.992. The method detection limits, accuracy and precision were 0.095 and 3.03 μg L−1, 91.5−96.0 % and 93.0−98.5 %, and 2.5–4.5 and 3.8–7.1 % (n:5, 25 and 100 μg L−1) for Cu+ and Cu2+ ions, respectively. A preconcentration of 70-fold was obtained from 35-mL of sample. After validation, the method was successfully applied to determination of total Cu levels in lichen and mushroom samples after pre-reduction at pH 7.0, and the recoveries in the range of 90−96 % were obtained by two calibration approaches after spiking with 10 μg L−1. The results were also statistically compared with those obtained by FAAS analysis to ensure accuracy and precision.

中文翻译：

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在微体积紫外-可见分光光度法分析前从蘑菇和地衣样品中选择性提取 Cu+ 和 Cu2+ 离子：新型聚 (SMIm)-Tris-Fe3O4 纳米复合材料的应用

摘要 本研究制备了一种新型聚 (SMIm)-Tris-Fe3O4 纳米复合材料，用于通过超声辅助浊点萃取 (UA-CPE) 选择性萃取 Cu+ 和 Cu2+ 离子。通过ATR-FT-IR、1H NMR和XRD分析表征纳米复合材料。优化提取条件后，通过微量紫外-可见分光光度计在 347 nm 处针对样品空白独立检测铜离子。在最佳条件下，每个离子在pH 7.0和pH 5.0的范围内分别在0.3-150和10-350 μg L-1范围内获得了良好的线性关系，回归系数优于0.992。方法检测限、准确度和精密度分别为 0.095 和 3.03 μg L-1、91.5-96.0 % 和 93.0-98.5 % 以及 2.5-4.5 和 3.8-7.1 %（n:5、25 和 100 μg L-1）分别为 Cu+ 和 Cu2+ 离子。从 35 mL 样品中获得了 70 倍的预浓缩。经验证，该方法成功应用于在 pH 7.0 条件下预还原后测定地衣和蘑菇样品中的总铜含量，加标 10 μg L 后通过两种校准方法获得了 90-96% 的回收率-1。结果还与通过 FAAS 分析获得的结果进行了统计比较，以确保准确性和精密度。