Distribution and potential health impacts of microplastics and microrubbers in air and street dusts from Asaluyeh County, Iran
Distribution and potential health impacts of microplastics and microrubbers in air and street dusts from Asaluyeh County, Iran
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DOI：
10.1016/j.envpol.2018.10.039
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发表时间：
2019-01-01
影响因子：
8.9
通讯作者：
Jaafarzadeh, Neemat
中科院分区：
文献类型：
--
作者：
Abbasi, Sajjad;Keshavarzi, Behnam;Jaafarzadeh, Neemat
虽然微塑料（MP）在水生系统中的分布和影响已得到广泛研究，但关于其在陆地环境中的存在及其对人类健康的潜在影响的信息很少。在本研究中，街道灰尘和悬浮灰尘收集从城市和县的Asaluyeh，伊朗。通过各种显微技术（荧光、偏振光、SEM）对样品进行了表征，以便对城市和工业环境中可能被人类摄入或吸入的MP和微橡胶（MR）进行定量和分类。在从15个站点取回的< 5 mm街道灰尘中，每15 g样品平均有900个MP和250个MR，MP显示出一系列颜色和大小（1000 μ m）。大多数街道灰尘样品中占主导地位的球形和薄膜状颗粒和MR主要由不同大小的黑色碎片和纤维状颗粒。在两个地点每天收集的空气中的灰尘在八天的时间里显示，纤维状MP的大小从约2 μ m到100 μ m不等，每米（-3）约有1个。这些样本含有小的MR碎片，其精确特征更难以定义。根据街道灰尘中的中位浓度，建筑工人和幼儿通过摄入急性接触的估计值分别约为5和15 MP d（-1）以及2和7 MR d（-1）。可吸入颗粒物的毒性更难定义，但通过这种途径摄入的MP和MR的潜在毒性是在人工肺液存在下使用从街道灰尘中分离的颗粒物进行的试验中评价的。这两种类型的颗粒表现出氧化潜力，与国会议员显示消费不同的抗氧化剂，与相应的值为参考城市颗粒灰尘，但低于那些伦敦周围的颗粒物。因此，MP和MR有助于城市和工业粉尘的健康影响，但其确切的作用仍不清楚，需要进一步研究。(C)2018爱思唯尔有限公司版权所有
While the distribution and effects of microplastics (MPs) have been extensively studied in aquatic systems, there exits little information on their occurrence in the terrestrial environment and their potential impacts on human health. In the present study, street dust and suspended dust were collected from the city and county of Asaluyeh, Iran. Samples were characterized by various microscopic techniques (fluorescence, polarized light, SEM) in order to quantify and classify MPs and microrubbers (MRs) in the urban and industrial environments that are potentially ingestible or inhalable by humans. In < 5-mm street dust retrieved from 15 sites, there were an average of 900 MPs and 250 MRs per 15 g of sample, with MPs exhibiting a range of colours and sizes (1000 mu m). Most street dust samples were dominated by spherical and film-like particles and MRs largely made up of different sizes of black fragments and fibrous particulates. Airborne dust collected daily over an eight-day period at two locations revealed the ubiquity of fibrous MPs of sizes ranging from about 2 mu m to 100 mu m and an abundance of about 1 per m(-3). These samples contained small MR fragments whose precise characteristics were more difficult to define. Based on the median concentrations in street dust, estimates of acute exposure through ingestion are about 5 and 15 MP d(-1) and 2 and 7 MR d(-1) for construction workers and young children, respectively. Quantities of inhalable particulates were more difficult to define but the potential toxicity of MPs and MRs taken in by this route was evaluated from assays performed using particulates isolated from street dusts in the presence of an artificial lung fluid. Both types of particle exhibited oxidative potential, with MPs displaying consumptions of different antioxidants that were comparable with corresponding values for a reference urban particulate dust but lower than those for London ambient particulate matter. Thus, MPs and MRs contribute towards the health impacts of urban and industrial dusts but their precise roles remain unclear and warrant further study. (C) 2018 Elsevier Ltd. All rights reserved.