Environmental Toxicology and Chemistry
Environmental Toxicology and Chemistry
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DOI：
10.1002/etc.4677
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发表时间：
2020-01
影响因子：
4.1
通讯作者：
Francis K. Migwi;J. Ogunah;J. Kiratu
中科院分区：
文献类型：
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作者：
Francis K. Migwi;J. Ogunah;J. Kiratu
微塑料是新出现的威胁污染物，已被证明可以提供有毒污染物，无论是来自环境还是来自其固有的有毒单体和添加剂，这是进入水生食物网的途径。在本研究中，确定了奈瓦沙湖（肯尼亚）地表水中微塑料负荷的发生、丰度和组成。地表水的理化参数进行了现场测量，微塑料样品收集浮游生物网拖网和处理过氧化氢分解有机物。回收的微塑料颗粒进行分类，通过目视观察和衰减全反射傅里叶变换红外光谱。地表水中的平均微塑料浓度范围为0.183 ± 0.017至0.633 ± 0.067个颗粒/m2，平均浓度为0.407 ± 0.135个颗粒/m2。识别出碎片、纤维和薄膜，主要由聚丙烯、聚乙烯和聚酯组成。相关性分析表明，微塑料数量与湖泊浊度、总氮、总磷之间存在较强的正相关关系。采样地点之间微塑料密度的高度变异性归因于人类活动，通过河流和支流的水和废水摄入，以及负责一般水循环的当地风模式的存在。我们的评估增加了淡水生态系统中微塑料存在的越来越多的文件，并为奈瓦沙湖和其他肯尼亚淡水系统的沉积物和生物群的未来监测和评估提供了基线。环境毒理化学2020;39：765-774。联系我们_SETAC
Microplastics are emerging threat contaminants that have been shown to provide toxic pollutants, either from the environment or from their inherent toxic monomers and additives, a pathway into the aquatic food web. In the present study, the occurrence, abundance, and composition of microplastic load in the surface water of Lake Naivasha (Kenya) was determined. The surface water physicochemical parameters were measured in situ; microplastic samples were collected using plankton net trawls and treated with H2O2 to decompose organic matter. The microplastic particles recovered were classified both by visual observation and by attenuated total reflection–Fourier transform infrared spectroscopy. The average microplastic concentration range in surface water was 0.183 ± 0.017 to 0.633 ± 0.067 particles/m2, with the mean concentration being 0.407 ± 0.135 particles/m2. Fragments, fibers, and films were identified and were mostly composed of polypropylene, polyethylene, and polyester. We also performed correlational analysis, which showed a strong positive association between microplastic quantity and turbidity, total nitrogen, and total phosphorus in the lake. The high variability in microplastic densities exhibited between the sampled locations was attributed to human activities, water and wastewater intake through rivers and tributaries, and the presence of local wind patterns responsible for the general water circulation. Our assessment adds to the growing documentation of microplastic presence in freshwater ecosystems, and provides a baseline for future monitoring and assessment in sediment and biota of Lake Naivasha and other Kenyan freshwater systems. Environ Toxicol Chem 2020;39:765–774. © 2020 SETAC