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Aging behavior of microplastics affected DOM in riparian sediments: From the characteristics to bioavailability

Journal of Hazardous Materials 2022 105 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Mengli Chen Mohan Bi, Mengli Chen Mengli Chen Xiangyu Yang, Xiangyu Yang, Mohan Bi, Mengli Chen Mengli Chen Xiangyu Yang, Mengli Chen Shushan Liu, Mohan Bi, Shushan Liu, Mengli Chen Shushan Liu, Shushan Liu, Mohan Bi, Shushan Liu, Shushan Liu, Yi Chen, Yi Chen, Mohan Bi, Mohan Bi, Yi Chen, Ruoyu Deng, Ruoyu Deng, Xiangyu Yang, Mohan Bi, Mohan Bi, Yi Chen, Yi Chen, Mohan Bi, Ruoyu Deng, Ruoyu Deng, Yi Chen, Yi Chen, Mengli Chen Mengli Chen Mengli Chen Yi Chen, Yi Chen, Xiangyu Yang, Yi Chen, Shushan Liu, Mengli Chen Shushan Liu, Mengli Chen Mengli Chen Yi Chen, Mengli Chen Mengli Chen Yi Chen, Mengli Chen Mengli Chen Mengli Chen

Summary

Researchers examined how aging of microplastics in riparian sediments affects dissolved organic matter characteristics and bioavailability, finding that accumulated and weathered microplastics alter carbon cycling functions in these critical river-land interface zones.

Study Type Environmental

Riparian zone is a hub for microplastics (MPs), and MPs accumulation also changes the function of the riparian zone (e.g., carbon pool) to pose a great threat to river ecosystems. Although it is known that MPs can be aged for changing their characteristic after accumulating in riparian sediment, the effect of MP aging behavior on sediment dissolved organic matter (DOM) bioavailability and carbon emission has not been elucidated. In this study, effects of pristine and aged MPs on the DOM characteristics and components were investigated in sediment. The results showed that pristine MPs increased DOM humification and promoted the formation of larger molecular weight components, thereby reducing DOM bioavailability by approximately 16~23% and inducing negative priming effect. However, inhibition of MPs on DOM bioavailability and the priming effect decreased with aging behavior. Mathematical models revealed that the fulvic acid-like substance of sediment DOM was the driven factor in the influence of sediment carbon stability. Further microbial analysis found that higher carbohydrate metabolism promoted DOM humification, thereby reducing CO emissions approximately by 19~26% after MPs accumulation. Thus, this study provided an integrated picture to understand the risk of MPs accumulation in sediment for a long term on terrestrial and aquatic ecosystems.

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