Currently, plastic pollutants in the aquatic environment have received much attention. The studies on the abundance of microplastics in the river system are consequently lower compared to the studies on the marine system. The study aimed to determine the abundance of microplastics in water and riverbank sediments of Miri River and classify their spatial distribution patterns. In this study, water and sediment samples were collected from five sampling points in Miri River to investigate the abundance and distribution of microplastics as well as the characteristics of microplastics in Miri River. The abundance of microplastics in water samples was within the range of 0.8 to 2.1 mg/L or 10.7 to 14.3 particle /L. In sediment samples, the abundance of microplastics was within the range of 26.2 to 62.5 mg/kg or 283.7 to 456.2 particle/kg. The main type of microplastics detected in both water and sediment samples was fragment type with proportions of 57.3% and 57.9%, respectively. The most abundance particle size of microplastics was size of less than 1 mm. Colored microplastics such as black and blue were mainly found in both water samples and sediment samples. The polymer types were identified using FTIR which were polyethylene, polypropylene, polyurethane, ethylene propylene diene monomer, Butyl-Branham, and ethylene vinyl acetate.

目前，水环境中的塑料污染物备受关注。因此，与对海洋系统的研究相比，对河流系统中微塑料丰度的研究较少。该研究旨在确定美里河水和河岸沉积物中微塑料的丰度，并对其空间分布模式进行分类。本研究从美里河的五个采样点采集水和沉积物样品，以调查微塑料的丰度和分布以及美里河中微塑料的特征。水样中微塑料的丰度在 0.8 至 2.1 毫克/升或 10.7 至 14.3 个粒子/升的范围内。在沉积物样本中，微塑料的丰度在 26.2 至 62.5 毫克/公斤或 283.7 至 456.2 颗粒/公斤的范围内。在水样和沉积物样品中检测到的微塑料主要类型为碎片型，占比分别为 57.3% 和 57.9%。微塑料最丰富的粒径小于1mm。黑色和蓝色等有色微塑料主要存在于水样和沉积物样品中。聚合物类型是使用 FTIR 鉴定的，它们是聚乙烯、聚丙烯、聚氨酯、乙烯丙烯二烯单体、丁基-Branham 和乙烯醋酸乙烯酯。