Uptake of Pb(II) onto microplastic-associated biofilms in freshwater: Adsorption and combined toxicity in comparison to natural solid substrates
| Autor: | Kun Qi, Shunqing Zhang, Weiwei Wang, Nan Lu, Jiunian Guan, Zirui Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Microplastics
Environmental Engineering Health Toxicology and Mutagenesis Daphnia magna 0211 other engineering and technologies Fresh Water 02 engineering and technology 010501 environmental sciences 01 natural sciences Adsorption Environmental Chemistry Animals Waste Management and Disposal Ecosystem 0105 earth and related environmental sciences 021110 strategic defence & security studies biology Chemistry Biofilm Sediment Heavy metals biology.organism_classification Pollution Lead Ionic strength Environmental chemistry Biofilms Toxicity Plastics Water Pollutants Chemical |
| Zdroj: | Journal of hazardous materials. 411 |
| ISSN: | 1873-3336 |
| Popis: | In the present study, microplastic-associated biofilms were cultivated in an urban lake and a reservoir using virgin expanded polystyrene (PS). The uptake of Pb(II) onto both natural (suspended particles and surficial sediment) and anthropogenic (virgin microplastics and microplastic-associated biofilms) solid substrates was investigated and compared as a function of contact time, pH, and ionic strength in batch adsorption experiments. The adsorption isotherms revealed that biofilms enhanced the adsorption capacity of Pb(II) onto microplastics; however, natural substrates still exhibited a higher capacity. Ionic strength and pH significantly influenced the adsorption of Pb(II) onto all of the solid substrates. Under neutral conditions, competitive adsorption of Pb(II) was observed between anthropogenic solid substrates and natural substrates, which may further alter the distribution of Pb(II) among these solid substrates. The combined toxicity tests of Pb(II) and each solid substrate were carried out using Daphnia magna, the results indicated biofilm enhanced the combined toxicity of Pb(II) and microplastics. Therefore, biofilms not only intensified the vector role of microplastics in the migration of heavy metals in freshwater, but also enhanced their combined toxicity, which may have further potential ecological risks to freshwater ecosystems. |
| Databáze: | OpenAIRE |
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