Chair of Urban Water Systems Engineering, Technical University of Munich, 85748 Garching, Germany.
Analytisches Forschungsinstitut für Non-Target Screening GmbH (AFIN-TS GmbH), Am Mittleren Moos 48, 86167 Augsburg, Germany.
Biomolecules. 2022 Jul 6;12(7):953. doi: 10.3390/biom12070953.
Assessing the sorption of trace organic compounds (TOrCs) into micro- and nanoplastic particles has traditionally been performed using an aqueous phase analysis or solvent extractions from the particle. Using thermal extraction/desorption-gas chromatography/mass spectrometry (TD-Pyr-GC/MS) offers a possibility to analyze the TOrCs directly from the particle without a long sample preparation. In this study, a combination of two analytical methods is demonstrated. First, the aqueous phase is quantified for TOrC concentrations using Gerstel Twister and TD-GC/MS. Subsequently, the TOrCs on the particles are analyzed. Different polymer types and sizes (polymethyl methacrylate (PMMA), 48 µm; polyethylene (PE), 48 µm; polystyrene (PS), 41 µm; and PS, 78 nm) were analyzed for three selected TOrCs (phenanthrene, triclosan, and α-cypermethrin). The results revealed that, over a period of 48 h, the highest and fastest sorption occurred for PS 78 nm particles. This was confirmed with a theoretical calculation of the particle surface area. It was also shown for the first time that direct quantification of TOrCs from PS 78 nm nanoparticles is possible. Furthermore, in a mixed solute solution, the three selected TOrCs were sorbed onto the particles simultaneously.
评估痕量有机化合物（TOrCs）在微纳米塑料颗粒中的吸附作用，传统上采用水相分析或从颗粒中溶剂萃取的方法进行。采用热提取/解吸-气相色谱/质谱联用（TD-Pyr-GC/MS），可以在无需进行长时间样品制备的情况下，直接从颗粒中分析 TOrCs。本研究展示了两种分析方法的结合使用。首先，使用 Gerstel Twister 和 TD-GC/MS 对水相中的 TOrC 浓度进行定量分析。随后，对颗粒上的 TOrCs 进行分析。选择了三种痕量有机化合物（菲、三氯生和α-氯氰菊酯），对不同类型和粒径的聚合物（聚甲基丙烯酸甲酯（PMMA），48 µm；聚乙烯（PE），48 µm；聚苯乙烯（PS），41 µm 和 PS，78 nm）进行了分析。结果表明，在 48 小时的时间内，PS 78nm 颗粒的吸附量最高且最快。这一结果通过对颗粒表面积的理论计算得到了证实。这也是首次证明可以直接从 PS 78nm 纳米颗粒中定量分析 TOrCs。此外，在混合溶质溶液中，三种选定的 TOrCs 同时被吸附到颗粒上。
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