Addition of biodegradable microplastics alters the quantity and chemodiversity of dissolved organic matter in latosol

Miao, Chen; Zhao, Xiaoru; Wu, Dongming; Peng, Licheng; Fan, Changhua; Zhang, Wen; Li, Qinfen; Ge, Chengjun

doi:10.1016/j.scitotenv.2021.151960

Cited by 50 publications

(12 citation statements)

References 54 publications

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“…Generally, biodegradable microplastics were reported to increase DOC contents. For instance, Chen et al 40 reported that the addition of 10% (w/w) biodegradable PBAT microplastics could significantly increase the soil DOC contents after 120-day incubation. These results suggested that, compared to conventional microplastics, biodegradable microplastics may more easily undergo biological or hydrolytic degradation, form water-soluble low-molecular-weight oligomers, and contribute to the soil DOC.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Deciphering the Fingerprint of Dissolved Organic Matter in the Soil Amended with Biodegradable and Conventional Microplastics Based on Optical and Molecular Signatures

Sun

et al. 2022

Environ. Sci. Technol.

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Biodegradable polymers are promoted as promising alternatives for conventional non-degradable plastics, but they may also negatively impact soil ecosystems. Here, we estimated the effects of biodegradable (polylactide (PLA) and polybutylene succinate (PBS)) and non-biodegradable (polyethylene (PE) and polystyrene (PS)) microplastics at a concentration of 1% (w/w) on dissolved organic matter (DOM) in two soil types, a black soil (BS) and a yellow soil (YS), by using fluorescence excitationemission matrix spectroscopy and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). PBS significantly increased the contents of soil dissolved organic carbon (DOC) and the relative intensities of protein-like components. The turnover rates of soil DOM were statistically higher in PBS treatments (0.106 and 0.196, p < 0.001) than those in other microplastic groups. The FT-ICR-MS results indicated that more labile-active DOM molecules were preferentially obtained in biodegradable microplastic treatments, which may be attributed to the polymer degradation. The conventional microplastics showed no significant effects on the optical characteristics but changed the molecular compositions of the soil DOM. More labile DOM molecules were observed in BS samples treated with PE compared to the control, while the conventional microplastics decreased the DOM lability in YS soil. The distinct priming effects of plastic-leached DOM may trigger the DOM changes in different soils. This study provided important information for further understanding the impact of microplastics on soil carbon processes.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Deciphering the Fingerprint of Dissolved Organic Matter in the Soil Amended with Biodegradable and Conventional Microplastics Based on Optical and Molecular Signatures

Sun

et al. 2022

Environ. Sci. Technol.

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“…For example, Zhang et al reported that the degradation of sulfamethoxazole (SMX) was decreased in the presence PS MPs and even more so in the presence of aged PS MPs, as the optical absorption capacity of PS MPs gradually increased with the photoaging time after the formation of new chromophores, such as carbonyl groups and conjugated double bonds . Additional studies also noted that the presence of photoaged MNPs resulted in decreased degradation of OPs compared to pristine ones. ,,, However, most studies reported that MNPs had a promoting effect on the photo-oxidation of OPs. ,,− Wang et al indicated that the photodegradation efficiency of atorvastatin (ATV) increased from 19.82% to 50.27% in the presence of 0.01 g/L and 0.5 g/L PS MPs, respectively .…”

Section: Photochemical Processes With Coexisting Constituentsmentioning

confidence: 99%

“…The photo-oxidation of MNPs may enhance or reduce the adsorption capacity toward pollutants, and thus change the mobility of pollutants. , Liu et al reported that the photoaged PS NPs increased the mobility of both nonpolar (pyrene) and polar contaminants (4-nonylphenol) in saturated loamy sand compared to pristine NPs due to increased binding with contaminants . In addition to affecting the adsorption behavior of other contaminants, the photo-oxidation of MNPs may also produce environmentally persistent free radicals (EPFRs) and ROS, and mediate the photochemical transformation of pollutants, such as organic pollutants (OPs), , heavy metals (HMs), and engineered nanoparticles (ENPs). , The modified surface properties, the generated EPFRs and ROS, and the leached polymer molecules and additives of MNPs after photo-oxidation can also change their toxicities to organisms and affect microorganisms in the surrounding matrix, such as biofilm formation on MPs, the growth of planktonic microbes, , as well as the microbial community in soil and sediment systems. , All in all, photo-oxidation can influence the physical, chemical, and biological processes of MNPs in aquatic and terrestrial environments.…”

Section: Introductionmentioning

confidence: 99%

Photo-oxidation of Micro- and Nanoplastics: Physical, Chemical, and Biological Effects in Environments

Xu,

Ou,

van der Hoek

et al. 2024

Environ. Sci. Technol.

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Micro-and nanoplastics (MNPs) are attracting increasing attention due to their persistence and potential ecological risks. This review critically summarizes the effects of photo-oxidation on the physical, chemical, and biological behaviors of MNPs in aquatic and terrestrial environments. The core of this paper explores how photo-oxidation-induced surface property changes in MNPs affect their adsorption toward contaminants, the stability and mobility of MNPs in water and porous media, as well as the transport of pollutants such as organic pollutants (OPs) and heavy metals (HMs). It then reviews the photochemical processes of MNPs with coexisting constituents, highlighting critical factors affecting the photo-oxidation of MNPs, and the contribution of MNPs to the phototransformation of other contaminants. The distinct biological effects and mechanism of aged MNPs are pointed out, in terms of the toxicity to aquatic organisms, biofilm formation, planktonic microbial growth, and soil and sediment microbial community and function. Furthermore, the research gaps and perspectives are put forward, regarding the underlying interaction mechanisms of MNPs with coexisting natural constituents and pollutants under photo-oxidation conditions, the combined effects of photo-oxidation and natural constituents on the fate of MNPs, and the microbiological effect of photoaged MNPs, especially the biotransformation of pollutants.

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“…The addition of PBAT biodegradable plastics increased microbial activity and external enzyme activity (such as Rhizopus oryzae lipase, invertase and cellulose). Therefore, the quantity and chemical diversity of soil DOM have changed (Chen et al., 2022). Compared with conventional MPs, the disintegration and formation of biofilms are more pronounced in soils containing BMPs, resulting in greater changes to the microbial community structure (Qi et al., 2020; Wang et al., 2020b).…”

Section: The Impact Of Mps On the C And N Cyclesmentioning

confidence: 99%

Effects and mechanism of microplastics on organic carbon and nitrogen cycling in agricultural soil: A review

Ma,

Yang,

et al. 2023

Soil Use and Management

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At present, microplastics (MPs) are a kind of emerging pollutants of concern in the environment, and have a wide and far‐reaching impact on terrestrial ecosystems. This paper summarizes the latest research progress of the impact of MPs pollution on the biogeochemical cycle of carbon (C) and nitrogen (N), and summarizes the current situation of MPs pollution in agricultural soil. On the basis of summarizing the effects of MPs on soil physicochemical properties, soil microorganisms, and soil plants and animals, this paper focuses on how soil MPs affect the C and N cycles by changing these factors. MPs can alter organic matter degradation and C and N cycles by changing the soil physicochemical properties, as well as the soil microbial and enzymatic activities. MPs may alter plants’ nutrient uptake processes, which in turn affects the ability of plants to photosynthesize and absorb C and N elements. MPs can affect the survival rate, the growth rate, and intestinal injury of soil animals, therefore indirectly affecting the soil C and N cycles. At the same time, this paper compares the different effects of conventional plastics and biodegradable plastics on soil, and looks forward to the current research deficiencies and the future research directions of ecotoxicology of MPs on C and N cycle.

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Addition of biodegradable microplastics alters the quantity and chemodiversity of dissolved organic matter in latosol

Cited by 50 publications

References 54 publications

Deciphering the Fingerprint of Dissolved Organic Matter in the Soil Amended with Biodegradable and Conventional Microplastics Based on Optical and Molecular Signatures

Deciphering the Fingerprint of Dissolved Organic Matter in the Soil Amended with Biodegradable and Conventional Microplastics Based on Optical and Molecular Signatures

Photo-oxidation of Micro- and Nanoplastics: Physical, Chemical, and Biological Effects in Environments

Effects and mechanism of microplastics on organic carbon and nitrogen cycling in agricultural soil: A review

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