This study aimed to provide the first description of the presence, quantity, and diversity of microplastics (MPs) in intertidal sediments from the world's longest natural beach, Cox's Bazar. MPs were extracted from 24 surficial sediment samples through the density separation method, and identification was carried out using a stereomicroscope. Results showed that the abundance of MPs varied from 200 to 378.8 items kg⁻¹ with the mean abundance of 368.68 ± 10.65 items kg⁻¹. Fibers were the dominant (53%) MPs in this study, followed by films (20%) and fragments (12%). The dominant plastic particle color was purple (18%), followed by pink (14%) and red (7%), with shapes that were mainly filamentous (53%) and irregular (41%). The majority (59%) of the MPs measured were 1–5 mm in size, followed by 0.5–1 mm (27%) and <0.5 mm (14%).

这项研究旨在提供对来自世界上最长的天然海滩Cox's Bazar的潮间带沉积物中微塑料（MPs）的存在，数量和多样性的首次描述。通过密度分离法从24个表层沉积物样品中提取MPs，并使用体视显微镜进行鉴定。结果表明，MP的丰度从200到378.8千克^-1不等，平均丰度为368.68±10.65千克^-1。在这项研究中，纤维是主要的MPs（53％），其次是薄膜（20％）和碎片（12％）。主要的塑料颗粒颜色是紫色（18％），其次是粉红色（14％）和红色（7％），形状主要是丝状（53％）和不规则形状（41％）。所测量的MP的大部分（59％）为1-5 mm，其次为0.5-1 mm（27％）和<0.5 mm（14％）。