Inter-storm variation in microplastic concentration and polymer type at stormwater outfalls and a bioretention basin
Inter-storm variation in microplastic concentration and polymer type at stormwater outfalls and a bioretention basin
复制标题
DOI：
10.1016/j.scitotenv.2021.151104
复制
发表时间：
2022-01-12
影响因子：
9.8
通讯作者：
Fahrenfeld, N. L.
中科院分区：
文献类型：
--
作者：
Boni, William;Arbuckle-Keil, Georgia;Fahrenfeld, N. L.
微塑料（MP）是淡水、海洋和土壤环境中常见的污染物。到目前为止，很少有研究报告了在雨水中观察到的MP浓度和聚合物类型，特别是没有单独的雨水管道集水区。本研究的目的是确定微塑料浓度，聚合物指纹，和风暴间的变化MP在两个雨水排放口和生物滞留盆地。复合雨水样本收集在每个站点的三个降雨事件，每个集水区与城市和郊区的土地利用。收集250至2000 μ m的颗粒，分成两个尺寸类别，用湿过氧化物氧化处理，用NaCl分离密度，并收集漂浮颗粒（碎片、薄膜和球体），用衰减全反射傅里叶变换红外光谱法（ATR-FTIR）进行分析。在采样点之间的总聚合物浓度和配置文件中观察到显着差异，可能是由于采样集水区内的土地利用差异，但不是大小类之间。最高的MP浓度观察到的样品相比，从生物滞留盆地的雨水排放口采样，表明潜在的绿色基础设施，以捕获MP在这里研究的大小范围。累积降雨量（1.5至4.5厘米）和MP浓度之间呈弱但显着的负相关，但没有相关性，前期干旱天数和MP浓度之间观察。这些数据代表MP浓度的保守测量值，因为纤维、颗粒（1.2 g/mL）未被靶向，但所有靶向颗粒均采用ATR-FTIR进行分析。总体而言，这些结果提供了深入了解的负载和字符（大小，形态，聚合物类型）的浮力MP颗粒在雨水中，可能是有用的，在设计缓解策略。(C)2021爱思唯尔有限公司版权所有。
Microplastics (MP) are a commonly reported pollutant in the freshwater, marine, and soil environment. Few studies to date have reported MP concentrations and polymer types observed in stormwater, particularly not for catchments with separate storm sewers. The objectives of this study were to determine the microplastic concentration, polymer fingerprints, and the inter-storm variation of MP in two stormwater outfalls and a bioretention basin. Composite stormwater samples were collected at each site across three rain events each in catchments with urban and suburban land use. Particles 250 to 2000 mu m were collected, separated into two sizes classes, treated with a wet peroxide oxidation, density separated with NaCl, and buoyant particles (fragments, films, and spheres) were collected for analysis with attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Significant differences were observed in the total polymer concentrations and profiles between the sampling sites, potentially due to differences in land use within the catchments sampled, but not between size classes. The highest MP concentrations were observed in samples from the bioretention basin compared to the stormwater outfalls sampled, indicating the potential for green infrastructure to capture MP in the size range studied here. A weak but significant negative correlation was observed between cumulative rainfall (1.5 to 4.5 cm) and MP concentrations but no correlation was observed between antecedent dry days and MP concentrations. These data represent a conservative measure of MP concentrations given that fibers, particles 1.2 g/mL) were not targeted, but all targeted particles were analyzed with ATR-FTIR. Overall, these results presented provide insight into the loading and character (size, morphology, polymer type) of buoyant MP particles in stormwater that may be useful in designing mitigation strategies. (C) 2021 Elsevier B.V. All rights reserved.