Journal
ANALYTICAL CHEMISTRY
Volume 93, Issue 10, Pages 4559-4566Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c04996
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Funding
- National Natural Science Foundation of China [21827815, 21620102008]
- National Key R&D Program of China [2016YFA0203102]
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The study developed a novel sample pretreatment method for the respective detection of MPs and NPs, which was applied to analyze real water samples with satisfactory recovery rates for both MPs and NPs.
Respective detection of microplastics (MPs) and nanoplastics (NPs) is of great importance for their different environmental behaviors and toxicities. Using spherical polystyrene (PS) and poly(methyl methacrylate) (PMMA) plastics as models, the efficiency for sequential isolation of MPs and NPs by membrane filtration and cloud-point extraction was evaluated. After filtering through a glass membrane (1 mu m pore size), over 90.7% of MPs were trapped on the membrane, whereas above 93.0% of NPs remained in the filtrate. The collected MPs together with the glass membrane were frozen in liquid nitrogen, ground, and suspended in water (1 mL) and subjected to pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) determination. The NPs in the filtrate were concentrated by cloud-point extraction, heated at 190 degrees C to degrade the extractant, and then determined by Py-GC/MS. For MPs and NPs spiked in pure water, the method detection limits are in the range of 0.05-1.9 mu g/L. The proposed method is applied to analyze four real water samples, with the detection of 1.6-7.6 mu g/L PS MPs and 0.6 mu g/L PMMA MPs in three samples, and spiked recoveries of 75.0-102% for MPs and 67.8-87.2% for NPs. Our method offers a novel sample pretreatment approach for the respective determination of MPs and NPs.
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