Application of a solid‐phase microextraction fiber coated with a graphene oxide‐poly(dimethylsiloxane) composite for the extraction of triazoles from water

Abstract

A solid-phase microextraction fiber was prepared by mixing graphene oxide and hydroxyl-terminated polydimethylsiloxane together and then coating the mixture on the surface of etched stainless-steel wire by sol-gel technology. After aging by heating, the graphene oxide-polydimethylsiloxane composite coated fiber was used for the direct solid phase microextraction of triazole fungicides from water samples. The properties of the graphene oxide-polydimethylsiloxane coating were characterized by transmission electron microscopy and thermogravimetric analysis. And the chemical stability of the coating was tested as well. Several important experimental parameters that could influence the extraction efficiency such as desorption temperature and time, extraction temperature and time, sample pH and stirring rate, were investigated and optimized. Under the optimized conditions, the limits of detection were in the range from 0.01 to 0.03 μg/L. The results indicated that the homemade fiber had the advantages of good thermal and chemical stability and high extraction efficiency, which was successfully applied to the analysis of triazoles in water samples.

Development of a Simple Integrative Carbon Nanomaterial Microextraction Method with GC-MS for Assessing Pesticide Residues in Apples

“…Notably, our approach yields low LOD and LOQ values. Other studies that applied CNMs for pesticide analyses using SPME processes have reported detection or quantifcation limits similar to those presented above [44], even with a green coating (cork) [45]. Moreover, the results were better than [46] or similar to [47] using other extraction techniques.…”

Facile synthesis of magnetic zinc metal‐organic framework for extraction of nitrogen‐containing heterocyclic fungicides from lettuce vegetable samples

“…However, these detection methods suffer greatly from matrix interferences within the complex sample matrix, often resulting in false positives . Currently, SPE of nitrogen‐containing heterocyclic fungicides is challenging due to the low adsorption capacity, slow mass transfer, and challenging separation of available adsorbents . Consequently, it is therefore essential to explore inexpensive adsorbents with high, selective adsorption capacities, and high achievable separation for the concentration and treatment of nitrogen‐containing heterocyclic fungicides prior to detection .…”

Preparation of metal‐organic framework UiO‐66‐incorporated polymer monolith for the extraction of trace levels of fungicides in environmental water and soil samples

“…A preconcentration step prior to chromatographic analysis is usually needed to decrease the matrix effect and enrich the analytes. Traditional fungicide extraction methods were performed by complicated and solvent‐consuming procedures such as liquid‐phase extraction and SPE, which have been replaced by more environment‐friendly microextraction methods including solid‐phase microextraction (SPME), magnetic solid‐phase extraction, and liquid‐liquid microextraction.…”