Synthesis of magnetic Cu/CuFe2O4@MIL-88A(Fe) nanocomposite and application to dispersive solid-phase extraction of chlorpyrifos and phosalone in water and food samples

Amini, Shima; Amiri, Maryam; Ebrahimzadeh, Homeira; Seidi, Shahram; Kandeh, Saeed Hejabri

doi:10.1016/j.jfca.2021.104128

Cited by 37 publications

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“…The bond at 3350 cm -1 is related to -OH stretching vibrations in EVA. Despite that the vinyl acetate monomer does not have -OH group in its structure, there is an interaction between the carbonyl group with a neighbor hydrogen atom for forming the hydrogen bonds and conjugated carbonyls, either with the methylene of the vinyl acetate or the ethylene monomer (Fig S. 4. In this pattern spectra, there is a broad peak at approximately 2θ = 24˚, that is representative of amorphous structure of PVC/EVA/CS/Str nano bers.…”

Section: Characterization Of Electrospun Nano Bersmentioning

confidence: 98%

“…Despite that the vinyl acetate monomer does not have -OH group in its structure, there is an interaction between the carbonyl group with a neighbor hydrogen atom for forming the hydrogen bonds and conjugated carbonyls, either with the methylene of the vinyl acetate or the ethylene monomer (Fig S.3.) (Ramírez-Hernández et al 2019).The XRD of PVC/EVA/CS/Str nano bers is demonstrated in Fig S 4…”

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confidence: 96%

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Efficient thin-film micro extraction of trace herbicides from food samples using composite electrospun PVC/EVA/CS/Str nanofibers prior to CD-IMS analysis

Nejabatia

Aminia

Ebrahimzadeh

2022

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An electrospun composite of poly vinyl chloride/ethylene vinyl acetate/chitosan/starch (PVC/EVA/CS/Str) was synthesized and used as a new sorbent for thin film-micro solid phase extraction (TF-µSPE) of atrazine (ATZ) and ametryn (AMT) prior to corona discharge-ionic mobility spectrometry (CD-IMS) analysis. From the evaluation of scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy, the synthesis of composite nanaofibers was approved. Based on the investigations, thanks to the existence of CS/Str, the synthesized composite nanofibers exhibited large surface area, high porosity, and acceptable reusability. Also, the sorbent provided various interactions with the intended analytes, (hydrophobic contacts, hydrogen bonding, and π-π stacking interactions) resulting in the improvement of extraction efficiency. Effective factors on adsorption and desorption steps were optimized by using both design-expert and one at time method. Under the optimized conditions, the linearity was obtained 8.0-300.0 ng. mL− 1 with determination coefficient (r2) ≥ 0.9821. Limits of detection (LOD) based on S/N = 3 were 2.5 ng.mL− 1 and 2.3 ng. mL− 1 for ATZ and AMT, respectively. The relative standard deviations (RSDs) were in range of between 4.8 and 7.0%. Finally, the efficiency of the TF-µSPE-CD-IMS method was evaluated for the determination of ATZ and AMT in lettuce, tomato, and milk samples with good recoveries (88.6 to 98.1%).

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Section: Characterization Of Electrospun Nano Bersmentioning

confidence: 98%

mentioning

confidence: 96%