Binary solvent extraction of microplastics from a complex environmental matrix

IF 2.1 3区 地球科学 Q2 LIMNOLOGY
Oluniyi O. Fadare, Leisha Martin, Nigel Lascelles, Jessica T. Myers, Karl Kaiser, Wei Xu, Jeremy L. Conkle
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Abstract

Separating microplastics (MPs) (smaller particle size, < 1 mm) from complex environmental samples such as particulate organic matter (POM) is challenging, particularly for polyethylene and polypropylene, which are buoyant like POM. It is often done using a time-consuming procedure, often with hazardous waste generation. We developed a simple, low-cost procedure using a binary solvent mixture (ethanol–water) followed by water solvation to separate MPs from estuarine POM and surface water. The isolated MPs were quantified and characterized using μFT-IR and scanning electron microscopy, with particle sizes ranging from 30 to 2500 μm and percentage mass from 2.62–21.3% wt/wt in POM and 0.04–0.42% wt/vol for surface water, respectively. Different polymer types, colors, and shapes were observed. Method recovery assessed using spiking yielded 89–93.1% and the method was validated by visual sorting with dye staining. This method is low-cost, simple, and aligns with Green Chemistry approaches while efficiently separating plastics of various particle sizes, shapes, and compositions. Furthermore, this low-cost approach and the near-universal availability of ethanol make this method more accessible in research and education throughout regions of the world where plastic debris is a major challenge but resources to study the problem are limited.

Abstract Image

二元溶剂从复杂环境基质中提取微塑料
分离微塑料(MP)(较小的颗粒尺寸,<; 1. mm)是具有挑战性的,特别是对于像POM一样具有浮力的聚乙烯和聚丙烯。它通常使用耗时的程序来完成,通常会产生危险废物。我们开发了一种简单、低成本的程序,使用二元溶剂混合物(乙醇-水),然后进行水溶剂化,将MPs从河口POM和地表水中分离出来。使用μFT-IR和扫描电子显微镜对分离的MP进行定量和表征,颗粒尺寸范围为30-2500 μm,POM和地表水的质量百分比分别为2.62–21.3%wt/wt和0.04–0.42%wt/vol。观察到不同的聚合物类型、颜色和形状。方法使用加标法评估回收率,回收率为89–93.1%,并通过染料染色的视觉分选验证该方法。该方法成本低、简单,符合绿色化学方法,同时有效分离各种颗粒大小、形状和成分的塑料。此外,这种低成本的方法和乙醇几乎普及,使这种方法在世界各地的研究和教育中更容易获得,在这些地区,塑料碎片是一个主要挑战,但研究这一问题的资源有限。
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来源期刊
CiteScore
4.80
自引率
3.70%
发文量
56
审稿时长
3 months
期刊介绍: Limnology and Oceanography: Methods (ISSN 1541-5856) is a companion to ASLO''s top-rated journal Limnology and Oceanography, and articles are held to the same high standards. In order to provide the most rapid publication consistent with high standards, Limnology and Oceanography: Methods appears in electronic format only, and the entire submission and review system is online. Articles are posted as soon as they are accepted and formatted for publication. Limnology and Oceanography: Methods will consider manuscripts whose primary focus is methodological, and that deal with problems in the aquatic sciences. Manuscripts may present new measurement equipment, techniques for analyzing observations or samples, methods for understanding and interpreting information, analyses of metadata to examine the effectiveness of approaches, invited and contributed reviews and syntheses, and techniques for communicating and teaching in the aquatic sciences.
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