Magnetic solid‐phase extraction of pyrethroid pesticides in environmental water samples with CoFe<sub>2</sub>O<sub>4</sub>‐embedded porous graphitic carbon nanocomposites

An efficient and fast dispersive magnetic solid phase extraction method was developed using MIL-101(Cr)/poly (mercaptobenzothiazole)@magnetite nanoparticles for the preconcentration and determination of nitrophenols in river and rain water samples.High-performance liquid chromatography-Ultraviolet instrument was applied for the analysis of target nitrophenols. The effect of several variables on the extraction performance was explored via design of experiment approach. Limits of detection and linear dynamic ranges were attained in the range of 0.05-0.10 µg/L and 0.2-250 µg/L, respectively. The enrichment factors were in the range of 317-363. The precision (n = 3) of dispersive magnetic solid phase extraction method was in the range of 5.3-6.8%. Eventually, the method was utilized for the analysis of target nitrophenols in river and rain water samples. K E Y W O R D Sextraction, magnetic nanoparticles, MIL-101(Cr), nitrophenols, preconcentration, poly (mercaptobenzothiazole) 3528 SUPPORTING INFORMATIONAdditional supporting information may be found online in the Supporting Information section at the end of the article.How to cite this article: Sohaniyan M, Manoochehri M, Daghighi Asli M. Liquid chromatographic determination of trace levels of nitrophenols in water samples after dispersive magnetic solid phase extraction.

Section: Introductionmentioning

confidence: 99%

Liquid chromatographic determination of trace levels of nitrophenols in water samples after dispersive magnetic solid phase extraction

Sohaniyan

Manoochehri

Asli

2019

“…As a new sample preparation technique based on SPE, magnetic solid‐phase extraction (MSPE) has been increasingly applied in various analytical fields and shows many advantages . In this procedure, a magnetic adsorbent is dispersed in the sample solution, providing an efficient method for analytes extraction . Furthermore, phase separation of the magnetic adsorbents from the liquid matrix can be accomplished with an external magnet, without the need for additional filtration or centrifugation procedures, which facilitates phase separation .…”

Section: Introductionmentioning

confidence: 99%

Application of magnetized MOF‐74 to phthalate esters extraction from Chinese liquor

Wang

Zhang

et al. 2019

In this study, magnetized MOF-74 (Ni) was prepared using an ultrasound-assisted synthesis method. This novel functional magnetic adsorbent was characterized using various techniques. Using the prepared material as adsorbents, a magnetic solid-phase extraction method coupled with high-performance liquid chromatography was proposed for determining four phthalate esters in Chinese liquor samples. The extraction parameters, including solution pH, adsorbent amount, extraction time, and eluent type and volume, were optimized. Under the optimized conditions, proposed method showed good linearity within the range of 1.53-200 μg/L for diphenyl phthalate, 2.03-200 μg/L for butyl benzyl phthalate, 7.02-200 μg/L for diamyl phthalate, and 6.03-200 μg/L for dicyclohexyl phthalate, with correlation coefficients > 0.9944, low limits of detection (0.46-2.10 μg/L, S/N = 3), and good extraction repeatability (relative standard deviations of 3.7%, n = 6). This method was successfully used to analyze phthalate esters in Chinese liquor samples with recoveries of 74.4-104.8%. Two phthalate esters were detected in two samples, both at concentrations that satisfied the Chinese national standard, indicating this method has practical application prospects. The extraction efficiency of this method was also compared with conventional solidphase extraction using commercial C 18 cartridges. The results demonstrated that the proposed magnetic solid-phase extraction is a simple, time-saving, efficient, and lowcost method. K E Y W O R D Shigh-performance liquid chromatography, magnetic nanoparticles, magnetic solid-phase extraction, metalorganic frameworks, phthalate esters Article Related Abbreviations: MSPE, magnetic solid-phase extraction; PAEs, phthalate esters; DOBDC, 2,5-dihydroxyterephthalic acid; DPP, diamyl phthalate; MOF, metal-organic framework; PDA, photodiode array detector; TEOS, tetraethylorthosilicate. 1600

“…The introduction of dense carbon shell onto Fe 3 O 4 surface protects the magnetic core from oxidation and corrosion by harsh acidic solvents and provides the MCMs with –OH and –COOH, as well as strong π‐binding ability. At present, several types of CMMPs have been used for the MSPE of phthalate esters , pyrethroid pesticides , and polycyclic aromatic hydrocarbons .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of glucose‐derived carbon‐decorated magnetic microspheres for extraction of bisphenols from water and tea drinks

Lian

Jiang

et al. 2019

Glucose‐derived carbon‐decorated magnetic microspheres were synthesized by an easy hydrothermal carbonization method and used as a high‐efficiency adsorbent to extract bisphenols in water and tea drinks. The as‐prepared carbon‐decorated magnetic microspheres had a well‐defined core–shell structure with a shell thickness of about 5 nm. The microspheres possessed high saturation magnetization at 60.8 emu/g and excellent chemical stability in aqueous solution. The experimental parameters affecting the extraction efficiency, including extraction time, pH, adsorbent dosage, desorption solvents, desorption time, and solution volume were evaluated. Electrostatic and π–π interactions were the major driving forces during extraction. Overall, a new magnetic solid‐phase extraction method of determining bisphenols was developed on the basis of as‐prepared magnetic microspheres. The method had a wide linear range, low limits of detection (0.03–0.10 µg/L), and high recoveries (85.4–104.6%).