首页|The effect of microplastics on the depuration of hydrophobic organic contaminants in Daphnia magna: A quantitative model analysis

The effect of microplastics on the depuration of hydrophobic organic contaminants in Daphnia magna: A quantitative model analysis

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  • NETL
  • NSTL
  • Elsevier
Microplastics are emerging pollutants that can absorb large amounts of hydrophobic organic contaminants (HOCs). However, no biodynamic model has yet been proposed to estimate their effects on HOC depuration in aquatic organisms, where the HOC concentrations are time-varying. In this work, amicroplastic-inclusive biodynamic model was developed to estimate the depuration of HOCs via ingestion of microplastics. Several key parameters of the model were redefined to determine the dynamic HOC concentrations. Through the parameterized model, the relative contributions of dermal and intestinal pathways can be distinguished. Moreover, the model was verified and the vector effect of microplastics was confirmed by studying the depuration of polychlorinated biphenyl (PCB) in Daphnia magna (D. magna) with different sizes of polystyrene (PS) microplastics. The results showed that microplastics contributed to the elimination kinetics of PCBs because of the fugacity gradient between the ingested microplastics and the biota lipids, especially for the less hydrophobic PCBs. The intestinal elimination pathway via microplastics would promote overall PCB elimination, contributing 37-41 % and 29-35 % to the total flux in the 100 nm and 2 μm polystyrene (PS) microplastic suspensions, respectively. Furthermore, the contribution of microplastic uptake to total HOC elimination increased with decreasing microplastic size in water, suggesting that microplastics may protect organisms from HOC risks. In conclusion, this work demonstrated that the proposed biodynamic model is capable of estimating the dynamic depuration of HOCs for aquatic organisms. The results can shed light on a better understanding of the vector effects of microplastics.

Biodynamic modelHOCsIntestinal eliminationKineticsVector effects

Wei Lin、Yu Li、Xiaoying Xiao、Fuqiang Fan、Jiakun Jiang、Ruifen Jiang、Yong Shen、Gangfeng Ouyang

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Guangdong-Hong Kong Joint Laboratory for Water Security,Beijing Normal University,Zhuhai 519087,China, Center for Water Research,Advanced Institute of Natural Sciences,Beijing Normal University,Zhuhai 519087,China, KLGHEI of Environment and Energy Chemistry,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China

Guangdong-Hong Kong Joint Laboratory for Water Security,Beijing Normal University,Zhuhai 519087,China, Center for Water Research,Advanced Institute of Natural Sciences,Beijing Normal University,Zhuhai 519087,China

KLGHEI of Environment and Energy Chemistry,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China, Shantou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Shantou 515000,China

Center for Statistics and Data Science,Beijing Normal University,Zhuhai 519087,China

Guangdong Key Laboratory of Environmental Pollution and Health,School of Environment,Jinan University,Guangzhou 510632,China

KLGHEI of Environment and Energy Chemistry,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China

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2023

10.1016/j.scitotenv.2023.162813

Science of the Total Environment

Science of the Total Environment

EISCI
ISSN：0048-9697
年,卷(期)：2023.877(Jun.15)
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