聚苯乙烯微塑料对水培小麦幼苗（Triticum aestivum L.）吸收和铜镉毒性的影响。
Effects of polystyrene microplastic on uptake and toxicity of copper and cadmium in hydroponic wheat seedlings (Triticum aestivum L.).
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
出版信息
Ecotoxicol Environ Saf. 2021 Jul 1;217:112217. doi: 10.1016/j.ecoenv.2021.112217. Epub 2021 Apr 13.
Microplastics are widespread in freshwater environments, their biological effects and combined effects of other pollutants have attracted extensive attention. In this study, we investigated the adsorption properties of heavy metals onto polystyrene (PS) microplastics as well as the bioavailability and toxicity of microplastics and heavy metals by hydroponic wheat seedlings experiment. Results showed that PS microplastics (0.5 µm, 100 mg/L) had no significant effect on wheat seedlings growth, photosynthesis, and reactive oxygen species (ROS) content. However, PS microplastics could adsorb copper and cadmium, with a predominantly chemisorption. The accumulation of copper and cadmium in wheat seedlings reduced in the presence of PS microplastics, which meant the toxic effect by heavy metals might be mitigated. Compared with single heavy metals treatments, the combination of PS microplastics and heavy metals increased chlorophyll content, enhanced photosynthesis and reduced the accumulation of ROS. These findings suggest that PS microplastics (0.5 µm, 100 mg/L) have a mitigating effect on the bioavailability and toxicity of copper and cadmium.
微塑料广泛存在于淡水环境中，其生物效应和与其他污染物的联合效应引起了广泛关注。在这项研究中，我们通过水培小麦幼苗实验研究了重 金属在聚苯乙烯（PS）微塑料上的吸附特性以及微塑料和重金属的生物可利用性和毒性。结果表明，0.5 µm、100 mg/L 的 PS 微塑料对小麦幼苗生长、光合作用和活性氧（ROS）含量没有显著影响。然而，PS 微塑料可以吸附铜和镉，主要是化学吸附。PS 微塑料的存在减少了小麦幼苗中铜和镉的积累，这意味着重金属的毒性可能得到缓解。与单一重金属处理相比，PS 微塑料和重金属的组合增加了叶绿素含量，增强了光合作用，减少了 ROS 的积累。这些发现表明，0.5 µm、100 mg/L 的 PS 微塑料对铜和镉的生物可利用性和毒性具有缓解作用。
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