日本冲绳亚热带岛屿沿海地表水样品中小微塑料的原位分析
In-situ analysis of small microplastics in coastal surface water samples of the subtropical island of Okinawa, Japan
摘要：
海洋塑料废弃物被广泛认为是一个全球性的环境问题。太阳微米级的塑料颗粒，尺寸上限为20微米，已被确定为对海洋生态系统造成损害的可能性最大。拥有精确的方法来量化自然环境中此类颗粒的丰度，对于确定它们所造成的问题的程度至关重要。使用光学显微拉曼镊子设置，我们已经确定了被困在海洋聚集体收集的亚热带岛屿冲绳周围的沿海地表水的颗粒的组成。单颗粒水平的化学成分分析表明，低密度聚乙烯占主导地位，占分析的亚微米塑料总量的75%。我们的研究结果显示，所有测试地点都存在塑料，其中人类活动频繁的地区浓度最高。聚苯乙烯的平均最小亚微米塑料尺寸为（2.53 +/- 0.85）μ m。我们还观察到额外的拉曼光谱上的塑料碎片的大小，这可能是由于风化或嵌入有机物的结构修改减少的峰。通过单颗粒水平的亚微米塑料识别，我们可以开始了解它们在海洋中的分散情况，并确定它们的毒性以及对海洋生物多样性和食物链的影响。
英文摘要：
Marine plastic debris is widely recognized as a global environmental issue. Sun-micron plastic particles, with an upper size limit of 20 um, have been identified as having the highest potential for causing damage to marine ecosystems. Having accurate methods for quantifying the abundance of such particles in a natural environment is essential for defining the extent of the problem they pose. Using an optical micro-Raman tweezers setup, we have identified the composition of particles trapped in marine aggregates collected from the coastal surface waters around the subtropical island of Okinawa. Chemical composition analysis at the single-particle level indicates dominance by low-density polyethylene, which accounted for 75% of the total sub-micron plastics analyzed. Our results show the occurrence of plastics at all test sites, with the highest concentration in areas with high human activities. The average, smallest sub-micron plastics size is (2.53 +/- 0.85)um for polystyrene. We also observed additional Raman peaks on the plastics spectrum with decreasing debris size which could be related to structural modification due to weathering or embedding in organic matter. By single-particle level sub-micron plastics identification, we can begin to understand their dispersion in the ocean and define their toxicity and impacts on marine biodiversity and food chain.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
