Abstract：
This study presents a novel approach for the quantification of silver ions in environmental water through the utilization of liquid-liquid microextraction, employing natural deep eutectic solvents in conjunction with inductively coupled plasma emission spectroscopy. The extracted solvent was characterized by Fourier transform infrared spectroscopy (FT-IR). The impact of various extractant types, extractant molar ratio, extractant volume, extraction time, and salt concentration on the efficacy of silver ion extraction was investigated. The findings indicate that the optimal extraction efficiency was attained by utilizing a 5-mL aqueous solution volume, containing 1000 μL thymol/lactic acid NADES 1:3, a salt concentration of 1 mg mL-1, a pH value of 4, and a vortex time of 4 min. Upon implementing the optimized experimental conditions, the recovery of target metal ions was from 96.9 to 101.0%. The relative standard deviations were observed to be within the range of 1.5 to 2.7%. The present study demonstrates the reproducibility, accuracy, and reliability of the method for detecting silver ions in environmental water, with linear range of 5~1000 ng mL-1 and limits of detection (LOD) and limits of quantification (LOQ) of 1.52 ng mL-1 and 5.02 ng mL-1, respectively.
摘要：
这项研究提出了一种通过利用液-液微萃取来定量环境水中银离子的新方法，采用天然的低共熔溶剂与电感耦合等离子体发射光谱。采用傅里叶变换红外光谱(FT-IR)对萃取溶剂进行了表征。各种萃取剂类型的影响，萃取剂摩尔比，萃取剂体积,提取时间,研究了盐浓度对银离子萃取的影响。结果表明，最佳的提取效率是通过使用5-mL的水溶液体积，含有1000μL百里酚/乳酸NADES1：3，盐浓度为1mgmL-1，pH值为4，涡旋时间为4分钟。在实施优化的实验条件后，目标金属离子的回收率为96.9％至101.0％。观察到相对标准偏差在1.5至2.7%的范围内。本研究证明了其可重复性，准确度,检测环境水中银离子的方法的可靠性，线性范围为5~1000ngmL-1，检测限（LOD）和定量限（LOQ）分别为1.52ngmL-1和5.02ngmL-1。
