Estuarine plastic dynamics: Analyzing export patterns from a typical semi-enclosed bay in Asia

文献类型： 外文期刊

第一作者： Wei, Nian

作者： Wei, Nian;Lu, Jungang;Jiao, Meng;Zong, Changxing;Zhang, Feng;Jiang, Chunhua;Zhu, Lixin;Liu, Kai;Cui, Tiefeng;Li, Daoji;Wei, Nian;Lu, Jungang;Jiao, Meng;Zong, Changxing;Zhang, Feng;Jiang, Chunhua;Zhu, Lixin;Liu, Kai;Cui, Tiefeng;Li, Daoji;Wei, Nian;Lu, Jungang;Jiao, Meng;Zong, Changxing;Zhang, Feng;Jiang, Chunhua;Zhu, Lixin;Liu, Kai;Cui, Tiefeng;Li, Daoji;Wei, Nian;Liu, Kai

作者机构：

关键词： Microplastic (MPs); Spatial distribution; Principal Coordinate Analysis (PCoA); Semi-enclosed bays; Hydrodynamic processes; Pollution management

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 492 卷

页码：

收录情况： SCI

摘要： Semi-enclosed estuarine systems are recognized as hotspots for microplastic (MP) pollution, yet their export dynamics remain poorly understood. This study investigates the distribution of microplastics (<5 mm) and macroplastics (>5 mm) in Sanya Bay, a typical semi-enclosed bay in southern China. Based on 45 surface water samples, MP concentrations ranged from 0.298 to 4.010 items/m(3) (mean: 1.628 +/- 1.055), significantly higher than macroplastics (mean: 0.109 +/- 0.338 items/m(3)). Most particles were fragments smaller than 5 mm, dominated by white, green, and transparent colors. The main polymers identified were polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET). A "dual-center" pattern was observed: low-density plastics (e.g., PP, PE) accumulated near river mouths and offshore islands, while high-density plastics (e.g., PET, PVC) settled in estuarine zones. Principal Coordinate Analysis (PCoA) revealed spatial clustering across estuarine, coastal, and offshore areas, influenced by land-based inputs, human activity, and hydrodynamic transport. This study provides new insights into plastic transport mechanisms in semi-enclosed bays and highlights the importance of integrating plastic properties with environmental forces. The findings support targeted pollution management in similar coastal environments.

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