张明兴,
王莹,
王立军,
张微微,
王菊英
国家海洋环境监测中心, 海洋垃圾和微塑料研究中心, 大连 116023

作者简介: 张明兴(1991-),男,助理工程师,研究方向为污染物的生态毒理,E-mail:zmxs_1991@163.com.

基金项目: 国家重点研发计划专项(2016YFC1402204)；海洋公益性行业科研专项(201505034)


中图分类号: X171.5

Combined Toxicity of Polystyrene Microplastics and Heavy Metals to Brine Shrimp (Artemia parthenogenetica)

Zhang Mingxing,
Wang Ying,
Wang Lijun,
Zhang Weiwei,
Wang Juying
Marine Debris and Microplastics Research Center, National Marine Environmental Monitoring Center, Dalian 116023, China

CLC number: X171.5

-->

摘要
HTML全文
图(0)表(0)
参考文献(0)
相关文章
施引文献
资源附件(0)
访问统计

摘要:微塑料是一类重要的海洋污染物，由于其性质稳定、难以降解，对海洋生态系统具有潜在的危害。微塑料粒径小，比表面积大，容易吸附海洋中的重金属等污染物产生二次危害，因此研究微塑料与重金属的复合毒性效应对于正确评价微塑料的生态风险具有重要意义。本文以卤虫(Artemia parthenogenetica)作为研究对象，考察了10 μm聚苯乙烯微球与2种重金属(Cu²⁺和Cd²⁺)对卤虫无节幼体的单一及复合急性毒性。同时使用电感耦合等离子体质谱仪(ICP-MS)测定了卤虫体内Cu²⁺和Cd²⁺浓度随时间的变化情况，比较分析了聚苯乙烯微球对重金属在卤虫体内富集的影响。研究发现，Cu²⁺和Cd²⁺单一暴露时对卤虫无节幼体的24 h半数致死浓度(24 h-LC₅₀)分别为(1.26±0.15) mg·L^-1和(164.5±27.3) mg·L^-1，与聚苯乙烯微球共同作用时24 h-LC₅₀分别为(1.38±0.23) mg·L^-1和(178.3±36.4) mg·L^-1，聚苯乙烯微球的存在显著促进了卤虫对Cu²⁺和Cd²⁺的摄入和排出，但并未影响二者急性毒性。研究结果可为海洋环境中微塑料和重金属的生态风险评价提供理论依据。
关键词: 铜(Cu²⁺)/
镉(Cd²⁺)/
聚苯乙烯微球/
卤虫/
复合毒性

Abstract:As a kind of important marine pollutants, microplastics (MPs) are potentially harmful to the marine ecosystem because of their stable and non-degradable properties. MPs can easily absorb heavy metals and other pollutants in the ocean due to their small particle size and large specific surface area, which would result in additional ecological risks. Therefore, it is of great significance to study the mixture toxicity of MPs and heavy metals for their ecological risk assessment. The individual and mixture acute toxicities of 10 μm polystyrene (PS) and Cu²⁺ and Cd²⁺ on nauplii of brine shrimp, Artemia parthenogenetica, were investigated. The concentrations of Cu²⁺ and Cd²⁺ in nauplii were measured by inductively coupled plasma mass spectrometry (ICP-MS), and then the effects of the presence of polystyrene particles on the accumulation of heavy metals in nauplii were explored. The results showed that the 24-h median lethal concentration (LC₅₀) of Cu²⁺ and Cd²⁺ were (1.26±0.15) mg·L^-1 and (164.5±27.3) mg·L^-1, respectively. In contrast, the 24 h-LC₅₀ of Cu²⁺ and Cd²⁺ combined with PS were (1.38±0.23) mg·L^-1 and (178.3±36.4) mg·L^-1, respectively. Furthermore, the time-dependent concentrations of heavy metals in nauplii showed that the presence of polystyrene microspheres significantly promoted the uptake and excretion rates of Cu²⁺ and Cd²⁺ by nauplii of A. parthenogenetica. However, this promotion did not affect the acute toxicities of Cu²⁺ and Cd²⁺ compared with the absence of MPs. Our results could provide a theoretical basis for ecological risk assessment of microplastics and heavy metals in the marine environment.
Key words:Cu²⁺/
Cd²⁺/
polystyrene microsphere/
Artemia parthenogenetica/
combined toxicity.