Wang Duojia, Jiang Sabrina Yanan, Fan Changchang, Fu Longshan, Ruan Huada Daniel
Environmental Science Program, Department of Life Science, Faculty of Science and Technology, Beijing Normal University-Hong Kong Baptist University United International College, Zhuhai, Guangdong Province 519087, PR China.
National Observation and Research Station of Coastal Ecological Environments in Macao, Macao Environmental Research Institute, Macau University of Science and Technology, Taipa 999078, Macao.
Mar Pollut Bull. 2023 Dec;197:115759. doi: 10.1016/j.marpolbul.2023.115759. Epub 2023 Nov 20.
Microplastics have been identified as the novel contaminants in various environments. Phthalates would be released from plasticized microplastics into a riverine environment while transporting to a marine region, but data on their relationship in rivers have been scarce. In this study, the occurrence, distribution and correlation of microplastics and dibutyl phthalate (DBP) in two rivers from the Pearl River Estuary were investigated. The elevated level of DBP in the Qianshan River (2.70 ± 0.20 μg/L) was in alignment with the presence of highest microplastic concentration at the same sampling site (15.8 ± 9.8 items/L). A positive correlation was observed between microplastics and DBP in all sampling sites (p < 0.05). The results showed that UV irradiation from sunlight was a majorly inducing factor of DBP leaching from polyethylene microplastics. The concentrations of chemical additives in some degrees reflect the microplastic pollution, but environmental factors and multidimensionality of microplastics such as residence times and types may cause spatial differences of chemical additives in aquatic systems.
微塑料已被确定为各种环境中的新型污染物。邻苯二甲酸酯在增塑微塑料运输至海洋区域的过程中会释放到河流环境中，但关于它们在河流中关系的数据却很稀少。在本研究中，对珠江口两条河流中微塑料和邻苯二甲酸二丁酯（DBP）的存在情况、分布及相关性进行了调查。前山河中DBP的含量升高（2.70±0.20μg/L），这与同一采样点微塑料浓度最高（15.8±9.8个/升）的情况一致。在所有采样点，微塑料与DBP之间均观察到正相关（p<0.05）。结果表明，阳光中的紫外线辐射是导致DBP从聚乙烯微塑料中浸出的主要诱导因素。化学添加剂的浓度在一定程度上反映了微塑料污染，但环境因素以及微塑料的多维度特征（如停留时间和类型）可能会导致水生系统中化学添加剂的空间差异。
