Joint toxicity of microplastics with triclosan to marine microalgae Skeletonema costatum 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Environmental Pollution
年/卷/期
2019 / 246 / Mar.
页码
509-517
ISSN号
0269-7491
作者单位
Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, Peoples R China;Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Qingdao 266237, Peoples R China;
作者
Zhu, Zhi-lin;Wang, Su-chun;Zhao, Fei-fei;Wang, Shu-guang;Liu, Fei-fei;Liu, Guang-zhou;
摘要
Toxicity of single microplastics on organisms has been reported widely, however, their joint toxicity with other contaminants on phytoplankton is rarely investigated. Here, we studied the toxicity of triclosan (TCS) with four kinds of microplastics namely polyethylene (PE, 74 mu m), polystyrene (PS, 74 gm), polyvinyl chloride (PVC, 74 mu m), and PVC800 (1 mu m) on microalgae Skeletonema costatum. Both growth inhibition and oxidative stress including superoxide dismutase (SOD) and malondialdehyde (MDA) were determined. We found that TCS had obvious inhibition effect on microalgae growth within the test concentrations, and single microplastics also had significant inhibition effect which followed the order of PVC800 > PVC > PS > PE. However, the joint toxicity of PVC and PVC800 in combination with TCS decreased more than that of PE and PS. The higher adsorption capacity of TCS on PVC and PVC800 was one possible reason for the greater reduction of their toxicity. The joint toxicity of PVC800 was still most significant (PE < PVC < PS < PVC800) because of the minimum particle size. According to the independent action model, the joint toxicity systems were all antagonism. Moreover, the reduction of SOD was higher than MDA which revealed that the physical damage was more serious than intracellular damage. SEM images revealed that the aggregation of microplastics and physical damage on algae was obvious. Collectively, the present research provides evidences that the existence of organic pollutants is capable of influencing the effects of microplastics, and the further research on the joint toxicity of microplastics with different pollutants is urgent. (C) 2018 Elsevier Ltd. All rights reserved.
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关键词/主题词
Microplastics;Joint toxicity;Triclosan;Growth inhibition;Oxidative stress;Antagonism;
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