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Impact of polyamide microplastics on riparian sediment structures and Cd(II) adsorption: A comparison of natural exposure, dry-wet cycles, and freeze-thaw cycles

Journal of Hazardous Materials 2024 34 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 65 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Wenjuan He, Wenjuan He, Si Liu, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Si Liu, Si Liu, Wenjuan He, Wenjuan He, Si Liu, Jinhui Huang, Wenjuan He, Jinhui Huang, Jinhui Huang, Jinhui Huang, Jinhui Huang, Jinhui Huang, Si Liu, Jinhui Huang, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Wenjuan He, Si Liu, Si Liu, Lixiu Shi, Wenjuan He, Lixiu Shi, Lixiu Shi, Lixiu Shi, Wenjuan He, Wenjuan He, Wenjuan He, Enjie Li, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Lixiu Shi, Wenjuan He, Lixiu Shi, Lixiu Shi, Lixiu Shi, Enjie Li, Chenyu Zhang Wei Zhang, Jinhui Huang, Haoliang Pang, Enjie Li, Haoliang Pang, Haoliang Pang, Enjie Li, Enjie Li, Enjie Li, Enjie Li, Lixiu Shi, Haoliang Pang, Haoliang Pang, Chenyu Zhang Lixiu Shi, Jinhui Huang, Chenyu Zhang Haoliang Pang, Haoliang Pang, Haoliang Pang, Haoliang Pang, Haoliang Pang, Haoliang Pang, Wenjuan He, Wenjuan He, Enjie Li, Haoliang Pang, Chenyu Zhang

Summary

This study looked at how polyamide microplastics affect riverbank sediments and their ability to absorb cadmium, a toxic heavy metal, under different weather conditions like freeze-thaw and dry-wet cycles. Microplastics destabilized the sediment structure and changed how organic matter behaved, which in turn altered how cadmium moved through the environment. These findings suggest microplastics in waterways could change how toxic metals travel and potentially reach drinking water sources.

Polymers

Study Type Environmental

Microplastics (MPs) accumulation in sediments has posed a huge threat to freshwater ecosystems. However, it is still unclear the effect of MPs on riparian sediment structures and contaminant adsorption under different hydrological processes. In this study, three concentrations of polyamide (PA) MPs-treated sediments (0.1%, 1%, and 10%, w/w) were subjected to natural (NA) exposure, dry-wet (DW) cycles, and freeze-thaw (FT) cycles. The results indicated that PA MPs-added sediment increased the micro-aggregates by 10.1%-18.6% after FT cycles, leading to a decrease in aggregate stability. The pH, OM, and DOC of sediments were significantly increased in DW and FT treatments. In addition, the increasing concentration of PA MPs showed an obvious decrease in aromaticity, humification, and molecular weight of sediment DOM in FT treatments. Also, high level of MPs was more likely to inhibit the formation of humic-like substances and tryptophan-like proteins. For DW and FT cycles, 0.1% and 1% PA MPs-treated sediments slightly increased the adsorption capacity of Cd(II), which may be ascribed to the aging of MPs. Further correlation analysis found that DW and FT altered the link between DOM indicators, and aggregate stability was directly related to the changes in sediment organic carbon. Our findings revealed the ecological risk of MPs accumulating in riparian sediments under typical hydrological processes.

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