Mixed hemimicelle solid-phase extraction based on magnetic halloysite nanotubes and ionic liquids for the determination and extraction of azo dyes in environmental water samples.

Authors:
Wei Liu
Wei Liu
School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
China
Miss Meriem Fizir, Dr
Miss Meriem Fizir, Dr
School of Sciences
analytical chemistry
Pharmaceutical analysis
nanjing, jianing | China
Fan Hu
Fan Hu
Zhongshan Hospital
China
Ang Li
Ang Li
State Key Laboratory of Bioorganic and Natural Products Chemistry
China
Jun Zha
Jun Zha
China Pharmaceutical University
China
Hua He
Hua He
China Pharmaceutical University
Nanjing Shi | China

J Chromatogr A 2018 May 28;1551:10-20. Epub 2018 Mar 28.

Department of Analytical Chemistry, China Pharmaceutical University, 24 Tongjia Lane, Nanjing 210009, China; Key Laboratory of Biomedical Functional Materials, China Pharmaceutical University, Nanjing 210009, China; Key Laboratory of Drug Quality Control and Pharmacovigilance, China Pharmaceutical University, Ministry of Education, 639 Longmian Avenue, Nanjing, 211198, Jiangsu Province, China. Electronic address:

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.

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http://dx.doi.org/10.1016/j.chroma.2018.03.051DOI Listing
May 2018
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