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Sample Preparation Techniques for the Analysis of Microplastics in Soil-A Review

Thomas, Daniela and Schuetze, Berit and Heinze, Wiebke Mareile and Steinmetz, Zacharias (2020). Sample Preparation Techniques for the Analysis of Microplastics in Soil-A Review. Sustainability. 12 , 9074
[Article Review/Survey]

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Abstract

Although most plastic pollution originates on land, current research largely remains focused on aquatic ecosystems. Studies pioneering terrestrial microplastic research have adapted analytical methods from aquatic research without acknowledging the complex nature of soil. Meanwhile, novel methods have been developed and further refined. However, methodical inconsistencies still challenge a comprehensive understanding of microplastic occurrence and fate in and on soil. This review aims to disentangle the variety of state-of-the-art sample preparation techniques for heterogeneous solid matrices to identify and discuss best-practice methods for soil-focused microplastic analyses. We show that soil sampling, homogenization, and aggregate dispersion are often neglected or incompletely documented. Microplastic preconcentration is typically performed by separating inorganic soil constituents with high-density salt solutions. Not yet standardized but currently most used separation setups involve overflowing beakers to retrieve supernatant plastics, although closed-design separation funnels probably reduce the risk of contamination. Fenton reagent may be particularly useful to digest soil organic matter if suspected to interfere with subsequent microplastic quantification. A promising new approach is extraction of target polymers with organic solvents. However, insufficiently characterized soils still impede an informed decision on optimal sample preparation. Further research and method development thus requires thorough validation and quality control with well-characterized matrices to enable robust routine analyses for terrestrial microplastics.

Authors/Creators:Thomas, Daniela and Schuetze, Berit and Heinze, Wiebke Mareile and Steinmetz, Zacharias
Title:Sample Preparation Techniques for the Analysis of Microplastics in Soil-A Review
Series Name/Journal:Sustainability
Year of publishing :2020
Volume:12
Article number:9074
Number of Pages:28
Publisher:MDPI
ISSN:2071-1050
Language:English
Publication Type:Article Review/Survey
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:plastic debris, microplastics, sample pretreatment, soil organic matter, density separation, digestion
URN:NBN:urn:nbn:se:slu:epsilon-p-109366
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109366
Additional ID:
Type of IDID
DOI10.3390/su12219074
Web of Science (WoS)000589475400001
ID Code:19775
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:23 Dec 2020 17:43
Metadata Last Modified:15 Jan 2021 19:46

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