Department of Analytical Chemistry, China Pharmaceutical University, 24 Tongjia Lane, Nanjing 210009, China.
Vocational and Technical College of Guizhou Minzu University, Guiyang, Guizhou 550025，China.
J Chromatogr A. 2018 May 25;1551:10-20. doi: 10.1016/j.chroma.2018.03.051. Epub 2018 Mar 28.
An effective and greener mixed hemimicelles magnetic solid phase extraction (MHMSPE) based on magnetic halloysite nanotubes (MHNTs) and ionic liquid (IL) is developed for the simultaneous enrichment and determination of anionic azo dyes in a spiked environmental water sample. In this MHMSPE, the formation of CmimBr with mixed hemimicelles on the surface of MHNTs leads to the retention of analytes by strong hydrophobic, p-p and electrostatic interactions. This MHMSPE technique combines the advantages of MHNTs and mixed hemimicelles. Zeta potential data demonstrated that mixed hemimicelles were formed in [CmimBr]/[MHNTs] ratios of the range from 0.15 to 1.33. Different important factors affecting the preconcentration of analytes were investigated and optimized by response surface methodology and one variable at a time. Under the optimum conditions, the limits of detection (LOD) for methyl red and methyl orange (MR and MO) were 0.042 and 0.050 μg L in samples, respectively. The accuracy of the method was assessed by recovery measurements on a spiked sample, and good recoveries 85-87% for MR and 89-93% for MO, with preconcentration factors of 481 and 524, respectively. The low relative standard deviations from 1.6-3.1% for tap water and 2.5-5.4% for lake water was achieved. So far as we know, this is the first development of a mixed hemimicelles SPE based on MHNTs and IL for the extraction of trace anionic azo dyes in environment water samples.
一种基于磁性埃洛石纳米管（MHNTs）和离子液体（IL）的有效且绿色混合拟胶束磁性固相萃取（MHMSPE）已被开发用于同时富集和测定环境水样中阴离子偶氮染料。在这种 MHMSPE 中，在 MHNTs 表面形成的 CmimBr 混合拟胶束通过强疏水、p-p 和静电相互作用保留分析物。这种 MHMSPE 技术结合了 MHNTs 和混合拟胶束的优点。Zeta 电位数据表明，在[CmimBr]/[MHNTs]比值范围为 0.15 至 1.33 时形成了混合拟胶束。通过响应面法和单变量法研究并优化了影响分析物预浓缩的不同重要因素。在最佳条件下，甲基红和甲基橙（MR 和 MO）在样品中的检出限（LOD）分别为 0.042 和 0.050 μg/L。通过对加标样品进行回收率测量评估了该方法的准确性，MR 的回收率为 85-87%，MO 的回收率为 89-93%，预浓缩因子分别为 481 和 524。自来水中的相对标准偏差为 1.6-3.1%，湖水为 2.5-5.4%，相对标准偏差较低。据我们所知，这是首次基于 MHNTs 和 IL 开发混合拟胶束 SPE 用于萃取环境水样中痕量阴离子偶氮染料。
