天然淡水中微塑料的存在导致有机物的浸出和消毒副产物的形成

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Kok Yuen Koh , Zhihao Chen , Shihan Lin , Kishan Chandra Mohan , Xiaohong Luo , J. Paul Chen
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引用次数: 8

摘要

微塑料在环境中无处不在,可能对水生生物和人类健康造成负面影响。它们存在于水和废水中,这些水和废水有多种来源,例如不适当的处理和乱扔垃圾。因此,评价MPs在不同水类型和氧化过程中的特征,研究溶解有机碳(DOC)浸出和氯仿生成具有重要意义。聚乙烯(PE)是一种常见的塑料物质,它被放置在不同的水中,并经历了芬顿反应和氯化反应。结果表明,在低剂量辐照/暗环境下,无论水类型如何,PE对DOC的浸出量几乎相同(1 mg L−1)。浸出的DOC导致水体氯化后形成氯仿。在与PE的fenton样反应过程中,与氯化反应(~ 0.8 mg L−1)相比,检测到更高的浸出量(~ 3 mg L−1)。氧化过程对聚乙烯的DOC浸出程度可以通过对聚乙烯表面结构的破坏程度来反映。然而,氯化导致PE生成更多的氯仿(~ 20 μg L−1),因为芬顿样反应降解了氯仿。次氯酸钠浓度越高,氯仿浓度越高。当氯仿与PE同时存在于水中时,首先观察到氯仿在PE上的吸附;但最终挥发速率大于吸附速率。本研究为我国淡水和饮用水中MPs的风险评估和可能的缓解策略提供了有用的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Leaching of organic matters and formation of disinfection by-product as a result of presence of microplastics in natural freshwaters

Leaching of organic matters and formation of disinfection by-product as a result of presence of microplastics in natural freshwaters

Microplastics (MPs) are ubiquitous in the environment that may cause negative impacts on the aquatic organisms and human health. They exist in water and wastewater, which are from several sources, such as inappropriate disposal and littering. Therefore, it is important to evaluate the characteristics of MPs in different water types and oxidation processes and study dissolved organic carbon (DOC) leaching and chloroform formation. A commonly existing plastic matter, polyethylene (PE) was placed in different waters and gone through the Fenton-like reaction and the chlorination. The result showed that the PE leached nearly a similar amount of DOC (<1 mg L−1), which was regardless of the water types and under low-dosed irradiation/dark environment. The leached DOC caused the chloroform formation after the chlorination in the waters. During the Fenton-like reaction with the PE, a higher amount of leached DOC (∼3 mg L−1) was detected compared with that in the chlorination (∼0.8 mg L−1). The degree of DOC leaching from the PE caused by the oxidation processes was reflected by the degree of surface structural damage on the PE. However, the chlorination resulted in a higher chloroform formation from the PE (∼20 μg L−1) as the Fenton-like reaction degraded the chloroform. The higher the sodium hypochlorite concentration, the higher the chloroform concentration. When the chloroform existed in the water with the PE, adsorption of chloroform onto the PE was initially observed; however the rate of volatilization would be higher than the rate of adsorption eventually. This study offers useful information for the risk assessment of MPs in our fresh water and drinking water and possible mitigation strategies.

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来源期刊
Chemosphere
Chemosphere 环境科学-环境科学
CiteScore
15.80
自引率
8.00%
发文量
4975
审稿时长
3.4 months
期刊介绍: Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.
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