Microplastics are recognized as an emerging global issue in marine environments. In this study, microplastic pollution in subtidal sediments from nine typical stations in the Bohai Sea was investigated. The mean concentration was 458.6 ± 150.0 items/kg of dry weight, varying from 280.0 to 773.4 items/kg. All of the microplastics were categorized according to shape, color and size. Among these microplastics, fiber (77.1%), white/blue/black (85.0%) and small microplastics (< 1500 μm) (82.9%) were the most abundant types. Seven polymer types were identified and were, in decreasing order of abundance, rayon > PE > PS > PP > PET > ABS > PA. The microplastics abundance was of the same order of magnitude as that of other similar areas. The microplastic characteristics suggest that tourism, maritime activities and sewage discharge are possible sources. Our results provide useful information for performing an environmental risk assessment of microplastic pollution in this area.

中文翻译：

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渤海海岸线近岸沉积物中的微塑料污染。

微塑料被认为是海洋环境中一个新兴的全球问题。本研究对渤海九个典型站点的潮下带沉积物中的微塑料污染进行了调查。平均浓度为 458.6 ± 150.0 项/公斤干重，从 280.0 到 773.4 项/公斤不等。所有的微塑料都根据形状、颜色和大小进行分类。在这些微塑料中，纤维（77.1%）、白/蓝/黑（85.0%）和小微塑料（<1500 μm）（82.9%）是最丰富的类型。确定了七种聚合物类型，按丰度降序排列，人造丝 > PE > PS > PP > PET > ABS > PA。微塑料丰度与其他类似区域的数量级相同。微塑料特征表明，旅游业、海上活动和污水排放是可能的来源。我们的结果为在该地区进行微塑料污染的环境风险评估提供了有用的信息。