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. 2024 Jun 22;46(7):260.
doi: 10.1007/s10653-024-02082-4.

What is the most effective analytical method for quantification and identification of microplastics in contaminated soils?

Maura Gabriela da Silva Brochado  1 , Bruno Gomes de Noronha  2 , Alessandro da Costa Lima  2 , Allana Grecco Guedes  3 , Renê Chagas da Silva  4 , Denise Cunha Fernandes Dos Santos Dias  2 , Kassio Ferreira Mendes  5
Affiliations

What is the most effective analytical method for quantification and identification of microplastics in contaminated soils?

Maura Gabriela da Silva Brochado et al. Environ Geochem Health. .

Abstract

The increasing concern over microplastics (MPs) contamination in agricultural soils due to excessive plastic use is a worldwide concern. The objective of this study was to determine which analytical technique is most effective for the analysis of MPs in agricultural soils. Near-infrared spectroscopy (NIR), scanning electron microscopy (SEM), multispectral analysis, and X-ray diffraction were used to analyze sections of clay soil containing varying percentages of virgin white MPs from 0 to 100%. X-ray analysis only detected MPs at high concentrations (20%). However, NIR at 2.300 nm and multispectral analysis at 395 nm demonstrated greater accuracy and sensitivity in distinguishing between all MPs levels. SEM revealed that MPs have an amorphous structure that is distinct from crystalline soil, potentially influencing their interactions with other soil constituents. These findings highlight the value of NIR and multispectral analysis in accurately identifying and measuring MPs in soil. Efficient management plans rely on increased awareness of MPs' environmental impact.

Keywords: Contaminants in soils; Detection techniques; Plastic pollution; Polymer characterization; Sustainable agriculture.

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