Manbohi Ahmad, Mehdinia Ali, Rahnama Reza, Hamzehpour Ali, Dehbandi Reza
Iranian National Institute for Oceanography and Atmospheric Science, Tehran 1411813389, Iran.
Iranian National Institute for Oceanography and Atmospheric Science, Tehran 1411813389, Iran.
Mar Pollut Bull. 2023 Mar;188:114562. doi: 10.1016/j.marpolbul.2022.114562. Epub 2023 Jan 19.
The occurrence of microplastics (MPs) in beach sediments of the southern Caspian Sea was well documented, however, there are still many unknowns about the abundances and distributions of MPs in the rivers ending to the Caspian Sea. Here, bank sediments of 26 sites in the thirteen rivers were surveyed in two seasons. However, there was not any significant difference (p > 0.05) between the concentrations of MPs during the two seasons. MPs were detected in all samples with mean concentrations of 214.08 ± 14.35 MPs/kg. The most common size, shape, color, and polymer types of MPs were L < 300 μm, fragment/film, white/transparent, and polystyrene (PS), respectively. In all rivers, positive MP gradients from upstream to downstream were observed. Maximum concentrations of MPs were found in the downstream parts of Chalus, Haraz, and Safarud rivers. Recreational-tourism and fishing activities had significant positive relationships (p < 0.05) with concentration of MPs in the rivers.
里海南部海滩沉积物中微塑料（MPs）的存在已有充分记录，然而，流入里海的河流中微塑料的丰度和分布仍有许多未知之处。在此，对13条河流中26个地点的河岸沉积物进行了两季调查。然而，两季微塑料浓度之间没有显著差异（p>0.05）。在所有样本中均检测到微塑料，平均浓度为214.08±14.35个微塑料/千克。微塑料最常见的尺寸、形状、颜色和聚合物类型分别为L<300μm、碎片/薄膜、白色/透明和聚苯乙烯（PS）。在所有河流中，均观察到从上游到下游微塑料呈正向梯度。微塑料的最高浓度出现在查卢斯河、哈腊兹河和萨法鲁德河的下游部分。休闲旅游和捕鱼活动与河流中微塑料的浓度呈显著正相关（p<0.05）。
