1. Zeolitic imidazolate framework-8 decorated with gold nanoparticles for solid-phase extraction of neonicotinoids in agricultural samples.
- Author
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Martínez-Pérez-Cejuela H, Pravcová K, Česlová L, Simó-Alfonso EF, and Herrero-Martínez JM
- Subjects
- Agave chemistry, Chromatography, High Pressure Liquid, Food Contamination analysis, Gold chemistry, Imidazoles chemistry, Limit of Detection, Neonicotinoids analysis, Pesticide Residues analysis, Reproducibility of Results, Soil Pollutants analysis, Soil Pollutants isolation & purification, Water Pollutants, Chemical analysis, Water Pollutants, Chemical isolation & purification, Zeolites chemistry, Metal Nanoparticles chemistry, Metal-Organic Frameworks chemistry, Neonicotinoids isolation & purification, Pesticide Residues isolation & purification, Solid Phase Extraction methods
- Abstract
A composite built with aminated zeolitic imidazolate framework and gold nanoparticles (AuNPs) for solid-phase extraction (SPE) of neonicotinoids in agricultural samples is presented. The composite was prepared through the assembly of AuNPs onto the surface of metal-organic framework based on the strong interaction between the amino group and AuNP. These metallic surfaces provided additional interactions based on the affinity of amino and cyano groups present in the target compounds. The composite was characterized by scanning electron microscopy, powder X-ray diffraction, Fourier-transform infrared spectroscopy, and surface area measurements. Regarding the SPE protocol, several parameters that can influence the extraction performance were optimized, such as sample volume or composition of elution solvent, among others. After elution, the analytes were determined via HPLC with diode-array detection. Under the selected conditions, satisfactory recoveries of five pesticides (thiamethoxan, clothianidin, imidacloprid, acetamiprid, and thiacloprid) were obtained (between 80 and 110%) in real samples, whereas the limits of detection ranged from 0.019 to 0.041 μg L
-1 in aqueous samples and 0.3 to 0.8 μg g-1 in solid samples.- Published
- 2021
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