Detection method of nanoplastics in farmland soils by pyrolysis-gas chromatography-mass spectrometry
Nanoplastics have attracted extensive attention due to ubiquitous distribution in the environment and potential adverse impacts.Although nanoplastics have been detected in aquatic ecosystems,their detection and quantitative analysis in soil remain an unsolved challenge.Therefore,a sensitive,effective,and low-cost extraction procedure is put forward for identification and quantification of nanoplastics(NPs)based on Pyrolysis-Gas Chromatography-Mass Spectrometry(Py-GC-MS)with polystyrene(PS)particles as a model NPs in soil samples.The procedures of extracting nanoplastics from farmland soils included density flotation,alkaline digestion,water bath evaporation and membrane filtration.The highest extraction efficiency for PS was achieved using the 10％KOH as digestion solution and ZnCl2(ρ=1.6 g·cm-3)as flotation solution.Furthermore,six actual soil samples were collected and detected to verify the feasibility of the proposed approach.The results demonstrated that the recovery of PS was 77.8％-88.3％with 25 nm PS of 100 μg·g-1 added in six actual soil samples.The test results showed that PS were detected in four soil samples at concentrations ranging from 3.45 μg·g-1to 10.26 μg·g-1,while no PS were detected in the other two samples,due to the concentration of PS was below the detection limit.The analysis and detection method of NPs was feasible.Therefore,this study provided an efficient method for nanoplastics analysis in soil.
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