Abstract A new and green deep eutectic solvent based liquid phase microextraction procedure (DES-LPME) has been developed for separation and preconcentration of nickel prior to micro-sampling flame atomic absorption spectrometric determination (MS-FAAS). Ni(II) was complexed with sodium diethyldithiocarbamate (NaDDTC) and was extracted to micro-volume DES phase. In this regard, tetra butyl ammonium chloride-decanoic acid component as 1:3 molar ratios was used to prepare DES. Analytical parameters such as pH of sample solution, sample volume, volume of DES and matrix effect that would affect the recoveries of nickel(II) were optimized. Quantitative recovery values for Ni(II) ions were obtained at pH 3.0. The preconcentration factor (PF) was calculated as 60. The limit of detection (LOD) and limit of quantification (LOQ) were determined to be as 0.13 μg L−1 and 0.43 μg L−1 respectively. The relative standard deviation (% RSD) was 3.2%. The validation of the developed method was proved by the analysis of the certified water reference materials and addition-recovery test. The presented deep eutectic solvent based liquid phase microextraction method (DES-LPME) was successfully applied for determination of nickel in some water and food samples from Turkey.

中文翻译：

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从环境样品中以二乙基二硫代氨基甲酸盐螯合物形式对痕量镍进行深共晶溶剂型液相微萃取

摘要 开发了一种新的、绿色的、基于低共熔溶剂的液相微萃取程序（DES-LPME），用于在微量采样火焰原子吸收光谱测定（MS-FAAS）之前分离和预浓缩镍。Ni(II) 与二乙基二硫代氨基甲酸钠 (NaDDTC) 复合并被萃取到微体积 DES 相。在这方面，使用摩尔比为 1:3 的四丁基氯化铵-癸酸组分来制备 DES。对影响镍 (II) 回收率的分析参数（例如样品溶液的 pH 值、样品体积、DES 体积和基质效应）进行了优化。Ni(II) 离子的定量回收率值是在 pH 3.0 下获得的。预浓缩因子 (PF) 计算为 60。检测限 (LOD) 和定量限 (LOQ) 确定为 0。分别为 13 μg L-1 和 0.43 μg L-1。相对标准偏差 (% RSD) 为 3.2%。通过对有证水标准物质的分析和添加回收试验证明了所开发方法的有效性。提出的基于深共晶溶剂的液相微萃取法 (DES-LPME) 已成功应用于测定土耳其一些水和食品样品中的镍。