Microplastics as vector for heavy metal contamination from the marine environment
Microplastics as vector for heavy metal contamination from the marine environment
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DOI：
10.1016/j.ecss.2015.12.003
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发表时间：
2016-09-05
影响因子：
2.8
通讯作者：
Canning-Clode, Joao
中科院分区：
文献类型：
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作者：
Brennecke, Dennis;Duarte, Bernardo;Canning-Clode, Joao
微塑料在海洋环境中的永久存在被认为是对几种海洋动物的全球威胁。重金属和微塑料通常包括在两个不同类别的污染物，但这两个压力源之间的相互作用知之甚少。在14天的实验操作，我们研究了两种重金属，铜（Cu）和锌（Zn）的吸附，从一个油漆的原始聚苯乙烯（PS）珠和老化的聚氯乙烯（PVC）碎片在海水中浸出。我们证明了重金属从油漆中释放到水中，两种微塑料类型都吸附了两种重金属。用分配系数和数学模型描述了这种吸附动力学。颗粒和水之间的分配系数范围为650和850之间的铜对PS和PVC，分别。PVC碎片中Cu的吸附量明显大于PS，这可能是由于PVC具有更高的表面积和极性。铜和锌的浓度显着增加PVC和PS在实验过程中，除了锌对PS。因此，我们发现这些类型的微塑料和重金属之间存在显着的相互作用，这可能对海洋生物和环境产生影响。这些结果有力地支持了最近的发现，即塑料可以在海洋系统中作为重金属离子的载体发挥关键作用。最后，我们的研究结果强调了监测海洋垃圾和重金属的重要性，主要与油漆有关，特别是在海洋战略框架指令（MSFD）的框架内。(C)2016爱思唯尔有限公司版权所有
The permanent presence of microplastics in the marine environment is considered a global threat to several marine animals. Heavy metals and microplastics are typically included in two different classes of pollutants but the interaction between these two stressors is poorly understood.During 14 days of experimental manipulation, we examined the adsorption of two heavy metals, copper (Cu) and zinc (Zn), leached from an antifouling paint to virgin polystyrene (PS) beads and aged polyvinyl chloride (PVC) fragments in seawater. We demonstrated that heavy metals were released from the antifouling paint to the water and both microplastic types adsorbed the two heavy metals. This adsorption kinetics was described using partition coefficients and mathematical models. Partition coefficients between pellets and water ranged between 650 and 850 for Cu on PS and PVC, respectively. The adsorption of Cu was significantly greater in PVC fragments than in PS, probably due to higher surface area and polarity of PVC. Concentrations of Cu and Zn increased significantly on PVC and PS over the course of the experiment with the exception of Zn on PS. As a result, we show a significant interaction between these types of microplastics and heavy metals, which can have implications for marine life and the environment. These results strongly support recent findings where plastics can play a key role as vectors for heavy metal ions in the marine system. Finally, our findings highlight the importance of monitoring marine litter and heavy metals, mainly associated with antifouling paints, particularly in the framework of the Marine Strategy Framework Directive (MSFD). (C) 2016 Elsevier Ltd. All rights reserved.