Effect and fate study with blue mussels and microplastic in a laboratory experiment: O2 depletion over time@en

Adult blue mussels (Mytilus spp.) were exposed to microplastic particles in a controlled laboratory experiment. A significant loss of PS beads in pilot studies was traced back to the aeration of the exposure units. Therefore, the aeration was paused during the exposure phase of 2 hours. In a pilot study, the oxygen saturation was measured over 2 hours with mixing every 20 min in four treatment groups: with or without mussel in an aerated or non-aerated (static) set-up. Oxygen saturation lowered to 96.0 % (equivalent to 9.6 mg O2/ml) at the end of the 2 hours of exposure in the non-aerated set-up with mussels due to their respiration.本研究通过可控室内实验，将成年蓝贻贝（Mytilus spp.）暴露于微塑料颗粒环境中。前期预实验中观测到聚苯乙烯微球（PS beads）出现显著损失，经溯源确认该现象源于暴露装置的曝气操作。因此，在为期2小时的暴露阶段内，曝气操作将被暂停。在一项预实验中，研究人员对4组处理体系的氧饱和度开展了时长2小时的连续监测，每20分钟进行一次搅拌；4组处理分别为：曝气或非曝气（静态）环境下，各设置含贻贝与无贻贝两组对照。在放置贻贝的非曝气体系中，经过2小时暴露阶段后，水体氧饱和度降至96.0%（对应溶解氧浓度为9.6 mg O₂/ml），该变化由贻贝的呼吸作用所致。