This study investigated the abundances and characteristics of microplastics in sediments and sandfish (Holothuria scabra) in Lampung and Sumbawa, Indonesia. Microplastics were found in 89.02% of all sandfish samples, with an average abundance of 2.01 ± 1.59 particles individual⁻¹. The abundance of microplastics was 58.42 ± 24.33 particles kg⁻¹ in surface sediments. Furthermore, there was a positive relationship between the abundance of microplastics in sandfish and sediments. Fragments and fibers with small-sized microplastics (300–1000 μm) were the most abundant types found in sandfish and sediments. Fourier-transform infrared (FTIR) analysis showed that polyethylene (30.08%), polypropylene (30.08%), polyurethane (12.20%), and polyethylene terephthalate (8.94%) were the most abundant polymers in the samples. Our results strongly indicate that microplastics in Lampung and Sumbawa originate from the fragmentation of large plastics. Better solid waste management in Indonesia is needed to reduce plastic waste leakage, which could become microplastics.

本研究调查了印度尼西亚楠榜和松巴哇的沉积物和沙鱼 ( Holoturia scabra ) 中微塑料的丰度和特征。在所有沙鱼样本中发现了 89.02% 的微塑料，平均丰度为 2.01 ± 1.59 个颗粒个体^-1。微塑料的丰度为 58.42 ± 24.33 个颗粒 kg ^-1在地表沉积物中。此外，沙鱼中微塑料的丰度与沉积物之间存在正相关关系。具有小尺寸微塑料（300-1000 μm）的碎片和纤维是在沙鱼和沉积物中发现的最丰富的类型。傅里叶变换红外 (FTIR) 分析表明，聚乙烯 (30.08%)、聚丙烯 (30.08%)、聚氨酯 (12.20%) 和聚对苯二甲酸乙二醇酯 (8.94%) 是样品中含量最多的聚合物。我们的研究结果强烈表明，楠榜和松巴哇的微塑料源自大型塑料的碎裂。印度尼西亚需要更好的固体废物管理，以减少可能变成微塑料的塑料废物泄漏。