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首页> 外文期刊>RSC Advances >Vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction for sensitive spectrophotometric determination of cobalt
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Vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction for sensitive spectrophotometric determination of cobalt

机译：涡流辅助低密度溶剂和表面活性剂的分散液-液微萃取用于分光光度法测定钴

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This study describes the development of vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction (VALS-DLLME) for Co( II ) prior to its spectrophotometric detection. The method consisted of the complexation of Co( II ) with pyrocatechol violet (PV) followed by the preconcentration of the Co(II)–PV complex using VALS-DLLME and then an absorption measurement at 600 nm. The optimum conditions for complex formation were a 1?:?3 mole ratio of Co( II ) and PV at pH 7.5, while the conditions for VALS-DLLME were 300 μL 1-dodecanol as extraction solvent, and 300 μL acetonitrile as dispersive solvent under a vortex for 20 s with the addition of cationic surfactant (0.02 mmol L ~(?1) CTAB). Under the optimum conditions, good linearity was in the range of 0.1–10 mg L ~(?1) , the enrichment factor (EF) was 13.5 and the low limit of detection (LOD) was 0.04 mg L ~(?1) . The method was applied to the analysis of Co( II ) in water, green leaf vegetable and vitamin B _(12) samples. The proposed method provided good recoveries in the range of 86–104%, which were comparable to those obtained from flame atomic absorption spectrophotometry.
机译：这项研究描述了在分光光度法检测之前，用于Co（II）的涡旋辅助低密度溶剂和表面活性剂的分散液-液微萃取（VALS-DLLME）的发展。该方法包括将Co（II）与邻苯二酚紫（PV）络合，然后使用VALS-DLLME对Co（II）-PV络合物进行预浓缩，然后在600 nm处进行吸收测量。络合物形成的最佳条件是在pH 7.5时Co（II）和PV的摩尔比为1？：？3，而VALS-DLLME的条件是300μL1-十二烷醇作为萃取溶剂，300μL乙腈作为分散溶剂。在涡旋下搅拌20秒，加入阳离子表面活性剂（0.02mmol L〜（β1）CTAB）。在最佳条件下，良好的线性范围为0.1–10 mg L〜（？1），富集因子（EF）为13.5，检测下限（LOD）为0.04 mg L〜（？1）。该方法用于水，绿叶蔬菜和维生素B _（12）样品中Co（II）的分析。所提出的方法可提供86-104％的良好回收率，与火焰原子吸收分光光度法获得的回收率相当。

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