Abstract This study proposes a novel deep eutectic solvent based-ferrofluid to develop a dispersive liquid phase microextraction method. The efficiency of the protocol was evaluated by determining the trace levels of Co (II) from environmental water samples by flame atomic absorption spectroscopy. Ultrasound was employed to enhance the sorbent dispersion with enhanced extraction recovery. The experimental variables with a significant impact on the cobalt extraction efficiency were also examined. Using the optimal conditions, the limit of detection and enrichment factor were 0.7 and 50 µg/L, respectively. The relative standard deviation was 2.6%. The proposed method successfully determined cobalt in water samples with recovery and relative standard deviation values from 96.4 to 99.0% and 2.4 to 3.9%, respectively. This promising method is an environmentally friendly, feasible, and efficient sample preparation route.

中文翻译：

---

超声辅助铁磁流体分散液相微萃取结合火焰原子吸收光谱法测定环境样品中的钴

摘要 本研究提出了一种新型的低共熔溶剂基铁磁流体，以开发一种分散液相微萃取方法。该协议的效率是通过火焰原子吸收光谱法测定环境水样中 Co (II) 的痕量水平来评估的。超声波被用来增强吸附剂的分散，并提高萃取回收率。还检查了对钴提取效率有显着影响的实验变量。使用最佳条件，检测限和富集因子分别为 0.7 和 50 µg/L。相对标准偏差为 2.6%。该方法成功测定了水样中的钴，回收率和相对标准偏差值分别为 96.4 至 99.0% 和 2.4 至 3.9%。