Thorough Multianalytical Characterization and Quantification of Micro- and Nanoplastics from Bracciano Lake’s Sediments

Sustainability

Virginia Vinciguerra¹  Antonella Petri¹  Antonella Manariti¹  Andrea Corti¹  Mario Cifelli¹  Valter Castelvetro¹  Sabrina Bianchi¹  Valentina Domenici¹  Valentina Iannilli²  Loris Pietrelli² 

[1] Dipartimento di Chimica e Chimica Industriale, via Moruzzi 13, 56124 Pisa, Italy;ENEA Casaccia, Via Anguillarese 301, 00123 Rome, Italy;

关键词: microplastics;    nanoplastics;    freshwater sediment;    nmr-dosy;    liquid chromatography;    separation;    pet;    polyolefins;   

DOI  :  10.3390/su12030878

来源: DOAJ

【 摘 要 】

Lake basins can behave as accumulators of microplastics released in wastewaters as such or resulting from degradation of larger items before and/or during their journey toward the marine environment as a final sink. A novel multianalytical approach was adopted for the detection and quantification of microplastics with size < 2 mm in the sediments of the volcanic lake of Bracciano, Italy. Simple analytical techniques such as solvent extraction/fractionation (for polyolefins and polystyrene) or depolymerization (for polyethylene terephthalate, PET), along with chromatographic detection (SEC and HPLC), allowed quantitative and qualitative determination of the main synthetic polymer contaminants. In particular, PET microplastic concentrations of 0.8−36 ppm were found, with variability related to the sampling site (exposure to incoming winds and wave action). Proton Nuclear Magnetic Resonance (¹H-NMR) and Attenuated Total Reflectance Fourier Transformed InfraRed (ATR-FTIR spectroscopic investigations supported the identification and chemical characterization of plastic fragments and polymer extracts. The average molecular weight of solvent extractable polymers was evaluated from 2D ¹H-NMR diffusion ordered spectroscopy (DOSY) experiments. The proposed, easily accessible multianalytical approach can be considered as a useful tool for improving our knowledge on the nature and the concentration of microplastics in sediments, giving insights on the impact of human activities on the health status of aquatic ecosystems.

【 授权许可】

Unknown