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Insights into effects of drying–wetting cycles on dissolved organic matter and Cd bioavailability in riparian sediments amended with microplastics

Environmental Research 2025 20 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 63 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

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

Summary

This study examined how microplastics interact with cadmium, a toxic heavy metal, in riverside sediments during wet and dry cycles that mimic natural flooding conditions. Biodegradable polylactic acid microplastics increased cadmium availability more than conventional plastics, likely because they release chemical additives as they break down. The results suggest that even biodegradable plastics in soil and sediment can make heavy metal contamination worse, raising concerns about their impact on water quality and food safety.

Polymers

PLA PS rubber

Study Type Environmental

Microplastics (MPs) affect the fractionation of cadmium (Cd) by altering physicochemical properties of sediment. However, differences in the effect of drying-wetting cycles on the bioavailability of heavy metals and dissolved organic matter (DOM) in sediment amended with MPs remain unclear. In this study, we investigated the influence of polystyrene (PS), polylactic acid (PLA), and tire wear particles (TWPs) at concentrations of 0.5% and 5% (w/w) on Cd fractionation and DOM properties of sediment under drying-wetting alternation conditions. The results showed that the surface of MPs displayed obvious increase in surface roughness and oxygen-containing functional groups after drying-wetting cycles. At the end of drying-wetting cycles, 0.5% and 5% MPs significantly decreased the sediment pH. And 5% PLA MPs and TWPs significantly increased the content of dissolved organic carbon (DOC). Besides, Cd bioavailability showed a slight decrease under wet conditions. However, 5% PLA MPs significantly increased F1 fraction by 7.82%-13.50%, which may be related to the release of additives. The aromaticity and humification degree of sediment-derived DOM were improved under drying-wetting alternation conditions. Further correlation analysis indicated that MPs indirectly affected Cd fractionation by influencing the sediment DOM properties. This study provides a new perspective for understanding the influence of MPs on the relationship between DOM and heavy metals in riparian sediments under typical hydrological condition.

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