Rimondi Valentina, Monnanni Alessio, De Beni Eleonora, Bicocchi Gabriele, Chelazzi David, Cincinelli Alessandra, Fratini Sara, Martellini Tania, Morelli Guia, Venturi Stefania, Lattanzi Pierfranco, Costagliola Pilario
Department of Earth Sciences, University of Florence, Via G. La Pira 4, 50121 Florence, Italy.
IGG-CNR, Via G. La Pira 4, 50121 Florence, Italy.
Toxics. 2022 Mar 26;10(4):159. doi: 10.3390/toxics10040159.
The terrestrial environment is an important contributor of microplastics (MPs) to the oceans. Urban streams, strictly interwoven in the city network and to the MPs' terrestrial source, have a relevant impact on the MP budget of large rivers and, in turn, marine areas. We investigated the fluxes (items/day) of MPs and natural fibers of Mugnone Creek, a small stream crossing the highly urbanized landscape of Florence (Italy) and ending in the Arno River (and eventually to the Tyrrhenian Sea). Measurements were done in dry and wet seasons for two years (2019-2020); stream sediments were also collected in 2019. The highest loads of anthropogenic particles were observed in the 2019 wet season (10 items/day) at the creek outlet. The number of items in sediments increased from upstream (500 items/kg) to urban sites (1540 items/kg). Fibers were the dominant shape class; they were mostly cellulosic in composition. Among synthetic items, fragments of butadiene-styrene (SBR), indicative of tire wear, were observed. Domestic wastewater discharge and vehicular traffic are important sources of pollution for Mugnone Creek, especially during rain events. The study of small creeks is of pivotal importance to limit the availability of MPs in the environment.
陆地环境是海洋微塑料（MPs）的重要来源。城市溪流紧密交织在城市网络中，且与微塑料的陆地来源相关，对大河以及进而对海洋区域的微塑料收支有着重要影响。我们调查了穆尼奥内河的微塑料和天然纤维通量（数量/天），穆尼奥内河是一条穿过意大利佛罗伦萨高度城市化地区并最终汇入阿诺河（最终流入第勒尼安海）的小溪。在2019年至2020年的两年时间里，分别在旱季和雨季进行了测量；2019年还采集了溪流沉积物。在2019年雨季，小溪出水口处观测到的人为颗粒负荷最高（10个/天）。沉积物中的颗粒数量从上游（500个/千克）到城市区域（1540个/千克）有所增加。纤维是主要的形状类别；其成分大多为纤维素。在合成物品中，观察到了丁二烯 - 苯乙烯（SBR）碎片，这表明存在轮胎磨损。生活污水排放和车辆交通是穆尼奥内河的重要污染源，尤其是在降雨期间。对小溪的研究对于限制环境中微塑料的存在至关重要。
