Abstract A sensitive, simple and green deep eutectic solvent based liquid phase microextraction (DES-LPME) method is described for the quantification of trace gold by flame atomic absorption spectrometry with a slotted quartz tube (SQT-FAAS). A 1:2 choline chloride:phenol mixture was utilized as the DES for the extraction of gold from the aqueous solution. All of the parameters affecting the extraction efficiency were optimized to increase the detection power of the FAAS. Under the optimum conditions, the presented method provided a linear range between 15 and 400 µg/L with limits of detection and quantification of 5.1 and 16.9 µg/L, respectively. An approximate 58-fold improvement was obtained in the detection power of the FAAS based on the limit of detection using the optimized DES-LPME-SQT-FAAS method. In order to check the validity/applicability of the method, recovery measurements were performed for spiked gold plating bath samples and the resulting recoveries were between 105.3% and 107.6%. The presented method was employed for real sample analysis.

中文翻译：

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准确测定镀液中金的含量：基于深共晶溶剂的液相微萃取——开槽石英管——火焰原子吸收光谱法

摘要 描述了一种灵敏、简单和绿色的基于深共晶溶剂的液相微萃取 (DES-LPME) 方法，用于通过带槽石英管的火焰原子吸收光谱法 (SQT-FAAS) 对痕量金进行定量。使用 1:2 氯化胆碱:苯酚混合物作为 DES 从水溶液中提取金。对影响提取效率的所有参数进行了优化，以提高 FAAS 的检测能力。在最佳条件下，所提出的方法提供了介于 15 和 400 µg/L 之间的线性范围，检测限和定量限分别为 5.1 和 16.9 µg/L。基于使用优化的 DES-LPME-SQT-FAAS 方法的检测限，FAAS 的检测能力提高了大约 58 倍。为了检查该方法的有效性/适用性，对加标金镀液样品进行了回收率测量，所得回收率介于 105.3% 和 107.6% 之间。所提出的方法用于实际样品分析。