Laboratory of Integrated Sciences (LabInSciences), Universidade Federal de São Paulo (Unifesp), Diadema, SP CEP 09972-270, Brazil.
Department of Environmental Sciences, Universidade Federal de São Paulo (Unifesp), Diadema, SP CEP 09972-270, Brazil.
Sci Total Environ. 2020 Dec 20;749:141604. doi: 10.1016/j.scitotenv.2020.141604. Epub 2020 Aug 10.
We assessed the concentrations of microplastics in sediment samples collected in seven sites from Solimões, Negro and Amazon rivers, upstream and downstream the metropolitan region of Manaus. Concentrations ranged from 417 to 8178 particles/kg of dried sediment (microplastics: 0.063-5 mm), and from 0 to 5725 particles/kg of dried sediment (microplastics: 0.063-1 mm). The highest microplastics concentrations were observed in samples from shallow water (water depth of 5-7 m) sites with lower water velocity of the Negro river surrounding Manaus, and the lowest concentration in farthest sample collected in deeper zone (water depth of 34 m) of the Amazon river around 110 km downstream Manaus. The variation of microplastics concentrations within the studied area can be related to hydraulic characteristics defining the erosive-depositional behavior of the sampling sites and their proximity to Manaus. Our results represent the first report to show the ubiquitous presence and widespread distribution of microplastics in sediments from the lower Solimões, lower Negro and upper Amazon rivers.
我们评估了在马瑙斯大都市地区上下游的索利蒙伊斯河、内格罗河和亚马逊河七个地点采集的沉积物样本中的微塑料浓度。浓度范围从每公斤干燥沉积物中 417 到 8178 个颗粒（微塑料：0.063-5 毫米），和从每公斤干燥沉积物中 0 到 5725 个颗粒（微塑料：0.063-1 毫米）。在马瑙斯附近内格罗河水流速度较低的浅水（水深 5-7 米）地点的样本中观察到最高的微塑料浓度，而在离马瑙斯下游约 110 公里处最深区域（水深 34 米）采集的样本中浓度最低。研究区域内微塑料浓度的变化可能与水力特征有关，这些特征决定了采样点的侵蚀-沉积行为及其与马瑙斯的接近程度。我们的结果首次表明，在索利蒙伊斯河下游、内格罗河下游和亚马逊河上游的沉积物中普遍存在和广泛分布微塑料。
