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<p>Environmental contamination with high-density polyethylene microplastics (MPs) can alter the dynamics of Cd adsorption in soil. The objective of the present study was to identify changes induced by MPs in the Cd<sup>2+</sup> adsorption on soils with contrasting texture, organic matter, and clay mineralogy. Leaching columns (three sections of 0.05 × 0.15&#xa0;m) were filled with disturbed samples (&lt; 2&#xa0;mm) of the A and Bi horizons of Udic Inceptisol (UI), and Humic Inceptisol (HI) and A, E and Bh of Orthod Spodosol (OS). The first layer of soil (0–0.05&#xa0;m) was mixed with 2% (w/w) of MPs (two sizes: 150&#xa0;µm and 40–48&#xa0;µm). The soil columns were incubated for 90&#xa0;days, with 10 periodic Cd applications (1 L each) (92, 185, 231, 527, 1186&#xa0;mg L<sup>−1</sup>) in column surface. The pseudo-total, water-soluble, exchangeable (outer sphere), and inner sphere Cd fractions were extracted by selective and sequential treatments and determined by ICP-OES. MPs did not result in impacts on pseudo-total Cd in soils layers. The pseudo-total Cd for the sandy soil (OS) (clay &lt; 100&#xa0;g&#xa0;kg<sup>−1</sup>) accumulated in the first layer due to its higher organic carbon (18.2&#xa0;g&#xa0;kg<sup>−1</sup>). A negative effect was observed for the smaller MPs on the outer sphere adsorption of Cd<sup>2+</sup> in the most electronegative first layer (A horizon) of HI and OS. There was difference among soil class on total Cd<sup>2+</sup> collected in leaching solution collected in the column base (mg column<sup>−1</sup>): OS—695.1 &gt; UI—367.8 &gt; HI—214.1. In practical case of double environmental contamination, the addition of &lt; 2% (w/w) of MPs did not interfere in the cationic heavy metal dynamics, independent of the texture, organic matter content and mineralogy of the clay fraction of the used soils.</p> Graphical abstract <p></p>

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Microplastics in soils with contrasting texture, organic carbon and mineralogy: changes in cadmium adsorption forms and their mobility in soil columns

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Gabriel dos Santos da Cruz,
  • Carla Gomes de Albuquerque,
  • Vander de Freitas Melo,
  • André Carlos Auler,
  • Eloana Janice Bonfleur

摘要

Environmental contamination with high-density polyethylene microplastics (MPs) can alter the dynamics of Cd adsorption in soil. The objective of the present study was to identify changes induced by MPs in the Cd2+ adsorption on soils with contrasting texture, organic matter, and clay mineralogy. Leaching columns (three sections of 0.05 × 0.15 m) were filled with disturbed samples (< 2 mm) of the A and Bi horizons of Udic Inceptisol (UI), and Humic Inceptisol (HI) and A, E and Bh of Orthod Spodosol (OS). The first layer of soil (0–0.05 m) was mixed with 2% (w/w) of MPs (two sizes: 150 µm and 40–48 µm). The soil columns were incubated for 90 days, with 10 periodic Cd applications (1 L each) (92, 185, 231, 527, 1186 mg L−1) in column surface. The pseudo-total, water-soluble, exchangeable (outer sphere), and inner sphere Cd fractions were extracted by selective and sequential treatments and determined by ICP-OES. MPs did not result in impacts on pseudo-total Cd in soils layers. The pseudo-total Cd for the sandy soil (OS) (clay < 100 g kg−1) accumulated in the first layer due to its higher organic carbon (18.2 g kg−1). A negative effect was observed for the smaller MPs on the outer sphere adsorption of Cd2+ in the most electronegative first layer (A horizon) of HI and OS. There was difference among soil class on total Cd2+ collected in leaching solution collected in the column base (mg column−1): OS—695.1 > UI—367.8 > HI—214.1. In practical case of double environmental contamination, the addition of < 2% (w/w) of MPs did not interfere in the cationic heavy metal dynamics, independent of the texture, organic matter content and mineralogy of the clay fraction of the used soils.

Graphical abstract