Enrichment of neonicotinoid insecticides from lemon juice sample with magnetic three‐dimensional graphene as the adsorbent followed by determination with high‐performance liquid chromatography

Magnetic zeolitic imidazolate framework 67/graphene oxide composites were synthesized by one-pot method at room temperature for the first time. Electrostatic interactions between positively charged metal ions and both negatively charged graphene oxide and Fe O nanoparticles were expected to chemically stabilize magnetic composites to generate homogeneous magnetic products. The additional amount of graphene oxide and stirring time of graphene oxide, Co , and Fe O solution were investigated. The zeolitic imidazolate framework 67 and Fe O nanoparticles were uniformly attached on the surface of graphene oxide. The composites were applied to magnetic solid-phase extraction of five neonicotinoid insecticides in environmental water samples. The main experimental parameters such as amount of added magnetic composites, extraction pH, ionic strength, and desorption solvent were optimized to increase the capacity of adsorbing neonicotinoid insecticides. The results show limits of detection at signal-to-noise ratio of 3 were 0.06-1.0 ng/mL under optimal conditions. All analytes exhibited good linearity with correlation coefficients of higher than 0.9915. The relative standard deviations for five neonicotinoid insecticides in environmental samples ranged from 1.8 to 16.5%, and good recoveries from 83.5 to 117.0% were obtained, indicating that magnetic zeolitic imidazolate framework 67/graphene oxide composites were feasible for analysis of trace analytes in environmental water samples.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One‐pot synthesis of magnetic zeolitic imidazolate framework/grapheme oxide composites for the extraction of neonicotinoid insecticides from environmental water samples

Cao

Jiang

Wang

et al. 2017

“…SPME is a solvent‐free sample preparation technique, which integrates sampling, isolation, and concentration into one step . It has been applied for the extraction of a wide variety of chemicals, such as phenols, polychlorinated biphenyls and polycyclic aromatic hydrocarbons, amine, aldehyde, etc . Since SPME is in principle based on the distribution equilibrium of the analytes between the sample solution and the solid phase fiber coating material, the fiber coating materials play a key role for the extraction performance of the analytes in SPME.…”

Section: Introductionmentioning

confidence: 99%

A porous carbon derived from amino‐functionalized material of Institut Lavoisier as a solid‐phase microextraction fiber coating for the extraction of phthalate esters from tea

Liang

Wang

Zang

et al. 2016

Self Cite

In this work, a porous carbon derived from amino-functionalized material of Institut Lavoisier (C-NH2 -MIL-125) was prepared and coated onto a stainless-steel wire through sol-gel technique. The coated fiber was used for the solid-phase microextraction of trace levels of phthalate esters (diallyl phthalate, di-iso-butyl ortho-phthalate, di-n-butyl ortho-phthalate, benzyl-n-butyl ortho-phthalate, and bis(2-ethylhexy) ortho-phthalate) from tea beverage samples before gas chromatography with mass spectrometric analysis. Several experimental parameters that could influence the extraction efficiency such as extraction time, extraction temperature, sample pH, sample salinity, stirring rate, desorption temperature and desorption time, were investigated. Under the optimal conditions, the linearity existed in the range of 0.05-30.00 μg/L for green jasmine tea beverage samples, and 0.10-30.00 μg/L for honey jasmine tea beverage samples, with the correlation coefficients (r) ranging from 0.9939 to 0.9981. The limits of detection of the analytes for the method were 2.0-3.0 ng/L for green jasmine tea beverage sample, and 4.0-5.0 ng/L for honey jasmine tea beverage sample, depending on the compounds. The recoveries of the analytes for the spiked samples were in the range of 82.0-106.0%, and the precision, expressed as the relative standard deviations, was less than 11.1%.

“…In particular, the development of MSPE overcomes the limitations of conventional SPE processes . Compared with traditional SPE, MSPE is based on the adsorption and release of target analytes by a small amount of magnetic or magnetizable sorbents that is dispersed in solution . Moreover, mass transfer of analytes could be facilitated by drastically increasing the interfacial area between adsorbent and sample solution, thus improving sample preparation efficiency .…”

Section: Introductionmentioning

confidence: 99%

Enrichment and determination of polybrominated diphenyl ethers in environmental water samples by magnetic solid‐phase extraction with core–shell magnetic carbon microspheres before gas chromatography with mass spectrometry

Zhou

She

Xing

et al. 2016

Core-shell magnetic carbon microspheres were synthesized by a simple hydrothermal method and used as a novel magnetic solid-phase extraction adsorbent for the sensitive determination of polybrominated diphenyl ethers in environmental water samples. Gas chromatography with negative chemical ionization mass spectrometry was adopted for the detection. Box-Behnken design was used to investigate and optimize important magnetic solid-phase extraction parameters through response surface methodology. Under the optimal conditions, low limits of detection (0.07-0.17 ng·L(-1) ), a wide linear range (1-1000 ng·L(-1) ), and good repeatability (0.80-4.58%) were achieved. The developed method was validated with several real water samples, and satisfactory results were obtained in the range of 72.8-97.9%. These results indicated that core-shell magnetic carbon microspheres have great potential as an adsorbent for the magnetic solid-phase extraction of polybrominated diphenyl ethers at trace levels from environmental water samples.