(Liquid+liquid) extraction of phenols from aqueous solutions with cineole

et al. 2020

Preprint

Methods and Experiments: In this study, a functionalized multiwalled carbon nanotube (MWCNT)-coated solid-phase microextraction (SPME) fiber was developed for concentrating analytes in aqueous samples. Sodium deoxycholate(NaDC) was used as a dispersing agent for non-covalent modification of MWCNTs. The coating showed porous structure and large adsorption capacity. To investigate the capability of this MWCNTs/NaDC SPME fiber, it was applied to the analysis of phenols in aqueous solution. After extraction, the analytes were desorbed in an acetonitrile–water solution and analyzed using high-performance liquid chromatography. Results: The MWCNTs/NaDC fiber exhibited good analytical performance, and fine preparation reproducibility was obtained with the relative standard deviations (RSDs) ranging from 4.9% to 10.2% (n = 6) in one batch, from 5.7% to 11.9% (n = 3) among different batches. Under the optimum extraction conditions, the detection limits were 0.15–0.30 ng/mL(S/N=3), the linear detection ranges were 1–100 ng/mL (R2≥0.9997) for these analytes, and good recoveries(80.3%–95.4%) were obtained for the spiked samples. Conclusion: This is a simple and accurate pretreatment method for the analysis of phenols in aqueous samples.

“…However, these techniques were usually time-consuming and required toxic organic solvents. 4,5 Therefore, ideal sample-preparation techniques are commonly required.…”

Section: Introductionmentioning

confidence: 99%

A simple strategy based on fibers coated with surfactant-functionalized multiwalled carbon nanotubes to improve the properties of solid-phase microextraction of phenols in aqueous solution

et al. 2020

Preprint

“…Liquid-liquid extraction and solid-phase extraction are well-established procedures for concentrating analytes in aqueous samples. 4 However, they are time-consuming and require medium to large volumes of high-purity organic solvents that are potentially toxic and expensive. 5 In the past few years, solvent-minimized extraction techniques, such as solid-phase microextraction (SPME), have been developed for the extraction of phenols.…”

Section: Introductionmentioning

confidence: 99%

A simple strategy based on fibers coated with surfactant-functionalized multiwalled carbon nanotubes to improve the properties of solid-phase microextraction of phenols in aqueous solution

et al. 2019

Preprint

A functionalized multiwalled carbon nanotube (MWCNT)-coated solid-phase microextraction (SPME) fiber was developed for concentrating analytes in aqueous samples. Sodium deoxycholate(NaDC) was used as a dispersing agent for non-covalent modification of MWCNTs. The coating showed porous structure and large adsorption capacity. To investigate the capability of this MWCNTs/NaDC SPME fiber, it was applied to the analysis of phenols in aqueous solution. After extraction, the analytes were desorbed in an acetonitrile-water solution and analyzed using high-performance liquid chromatography. The MWCNTs/NaDC fiber exhibited good analytical performance, and fine preparation reproducibility was obtained with the relative standard deviations (RSDs) ranging from 4.9% to 10.2% (n = 6) in one batch, from 5.7% to 11.9% (n = 3) among different batches. Under the optimum extraction conditions, the detection limits were 0.15-0.30 ng/mL(S/N=3), the linear detection ranges were 1-100 ng/mL (R2≥0.9997) for these analytes, and good recoveries(80.3%-95.4%) were obtained for the spiked samples. This is a simple and accurate pretreatment method for the analysis of phenols in aqueous samples.

“…Liquid-liquid extraction and solid-phase extraction are well-established procedures for concentrating analytes in aqueous samples. 4 However, they are time-consuming and require medium to large volumes of high-purity organic solvents that are potentially toxic and expensive. 5 In the past few years, solvent-minimized, membrane-based extraction techniques, such as solid-phase microextraction (SPME), have been developed for the extraction of phenols.…”

Section: Introductionmentioning

confidence: 99%

A simple strategy based on fibers coated with surfactant-functionalized multiwalled carbon nanotubes to improve the properties of solid-phase microextraction of phenols in aqueous solution

et al. 2019

Preprint

A functionalized multiwalled carbon nanotube (MWCNT)-coated solid-phase microextraction (SPME) fiber was developed for concentrating analytes in aqueous samples. Sodium deoxycholate(NaDC) was used as a wrapping layer for non-covalent modification of MWCNTs. Non-covalent bonding between the MWCNTs and sodium deoxycholate changed the electrical and steric resistance of the MWCNTs, and improved their solubility and dispersibility. To investigate the capability of this MWCNTs/NaDC SPME fiber, it was applied to the analysis of phenols in aqueous solution. After extraction, the analytes were desorbed in an acetonitrile–water solution and analyzed using high-performance liquid chromatography. The MWCNTs/NaDC fiber exhibited a response two to six times that of a commercial fiber for phenols. The hydrogen interactions with the analytes and the large surface area of the MWCNTs facilitated analyte adsorption with good selectivity and reproducibility. Under the optimum extraction conditions, the MWCNTs/NaDC fiber had a good linear range (1–100 ng/mL), repeatability for the extractions (relative standard deviation = 4.9%–7.1%, n = 3), low limits of detection (0.15–0.30 ng/mL), and satisfactory recoveries (80.3%–95.4%). This is an accurate and cost-effective pretreatment method.