Aquatic toxicity of iron-oxide-doped microplastics to Chlorella pyrenoidosa and Daphnia magna

Zhang, Fan1; Wang, Zhuang1; Song, Lan2,3; Fang, Hao1; Wang, De-Gao4

2020

10.1016/j.envpol.2019.113451

Environmental Pollution   影响因子和分区

18736424

1873-6424

Novel metal-oxide-doped microplastic particles (MMPs) have become emerging particulate plastics. The toxicity of MMPs in the aquatic environment remains unknown yet. In this study, toxicological effects of a representative MMP (iron-oxide core) with the nominal diameter of 1 μm and two different surface functional groups, amine-modified (MPS (Fe)–NH2) and carboxyl-modified (MPS (Fe)–COOH) polystyrene, were investigated by toxicity testing using Chlorella pyrenoidosa and Daphnia magna. The aquatic toxicity of two microplastic particles (MPS-NH2 and MPS-COOH) with the same particle size and surface modification in the absence of iron-oxide core was also observed and compared. Results show that the toxicity of MPS (Fe)–NH2 to the studied organisms (in terms of median effective concentration) was greater than the MPS (Fe)–COOH and non-iron-oxide-doped microplastic particles. Moreover, the MMPs mainly contributed to the toxicity rather than their dissolved fraction. The accumulation (based on total Fe) of MPS (Fe)–NH2 in C. pyrenoidosa was higher than the MPS (Fe)–COOH at low effect concentrations. The observations by optical microscopy indicated that the MPS (Fe)–NH2 was heavily adsorbed on the surface and distributed over the antennae, carapace, and apical spine of D. magna body whereas the MPS (Fe)–COOH was mainly accumulated inside the digestive tract of the daphnia. Furthermore, the analysis of intracellular reactive oxygen species level and antioxidant capacity confirmed that the intensities of the toxic effects cannot be linked to oxidative stress induced by the particles in the algae and daphnids. This work provides valuable insights into the ecological effects of MMPs, which is helpful for the quantitative assessment of food chain transfer of microplastics. It is worth noting that amine-modified metal-oxide-doped microplastics exhibited stronger aquatic toxicity than non-metal-oxide-doped microplastics.
© 2019 Elsevier Ltd

Microplastics Polystyrene Toxicity Alage Water flea

SCI ; EI

英语

其他

Natural Science Foundation of Jiangsu Province[BK20191403]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000514746800020

Elsevier Ltd

20194807739713

Algae ; Metals ; Microplastic ; Particle size ; Particle size analysis ; Polystyrenes ; Toxicity

Health Care:461.7 ; Inorganic Compounds:804.2 ; Organic Polymers:815.1.1 ; Materials Science:951

ENVIRONMENT/ECOLOGY

Web of Science

1.School of Environmental Science and Engineering, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, Nanjing; 210044, China
2.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen; 518055, China
3.Shenzhen Institute of Sustainable Development, Shenzhen; 518055, China
4.College of Environmental Science and Engineering, Dalian Maritime University, Dalian; 116026, China

Zhang, Fan,Wang, Zhuang,Song, Lan,et al. Aquatic toxicity of iron-oxide-doped microplastics to Chlorella pyrenoidosa and Daphnia magna[J]. Environmental Pollution,2020,257.

Zhang, Fan,Wang, Zhuang,Song, Lan,Fang, Hao,&Wang, De-Gao.(2020).Aquatic toxicity of iron-oxide-doped microplastics to Chlorella pyrenoidosa and Daphnia magna.Environmental Pollution,257.

Zhang, Fan,et al."Aquatic toxicity of iron-oxide-doped microplastics to Chlorella pyrenoidosa and Daphnia magna".Environmental Pollution 257(2020).