Determination of 28 Pesticides in Water Using Magnetic Hydroxylated Multi-walled Carbon Nanotubes and Gas Chromatography-Mass Spectrometry
Fe3O4 nanoparticle-modified hydroxylated multi-walled carbon nanotubes(Fe3O4-MWCNTs-OH)were synthesized using a co-precipitation method.The synthesized material was characterized using scanning electron microscopy,vibrating sample magnetometer,and X-ray diffraction.It was observed that the Fe3O4 particles were attached to MWCNTs-OH,forming nanoparticles with a diameter ranging from 100 to 300 nm.This nanoparticle modification resulted in a maximum magnetic strength of 5.48 emu/g,indicating excellent paramagnetic properties.Building upon this,a method for the simultaneous determination of 28 pesticides in water(such as phorate,alachlor,and fenpropathrin)was developed using gas chromatography-mass spectrometry-selected ion scanning technology.We conducted separate investigations on the effects of various factors such as the amount of sorbents,extraction time,and solvent on the extraction process.We optimized the extraction conditions and found that when the shaking and mixing time is set to 10 min,the material usage is 10 mg,and ethyl acetate is used as the optimal desorption solvent,the method shows a good linear relationship(r2≥0.991).The method detection limit ranges from 13.5 to 300 ng/L,and the limit of quantification ranges from 44.8 to 1 000 ng/L.These results demonstrate that this method offers high sensitivity and a wide linear range,making it suitable for the simultaneous determination of multiple pesticides in water.
Magnetic multiwalled carbon nanotubePesticideGas chromatography-Mass spectrometrySelective ion scanning
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