Abstract：
Microplastics, which are usually recognized as artificial polymer particles with a particle size <5 mm, have attracted much attention as new pollutants in recent years. Urban areas are a major contributor of microplastics to the environment, but their microplastic emission intensity and characteristics are not clear. In this paper, the microplastic abundances and characteristics in the Southern Jiangsu Canal were studied to reveal the effect of riverside cities on microplastics in river water. The results show that the microplastic abundance in the water body of the South Jiangsu Canal ranges from 3.41 to 19.07 particles L-1, with an average of 9.59 ± 3.95 particles L-1, which is at the same level as major urban agglomerations in the world. The top five polymers were polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE), chlorinated polyethylene (CPE) and polyurethane (PU). Fragments accounted for the largest proportion (68.47 %), followed by beads and fibers. Most microplastics were <100 μm (83.87 %). Human life and industry in riverside cities contribute significantly to microplastics in the Southern Jiangsu Canal water. After flowing through the cities, the microplastic abundance in the canal water increased by 26 % ~ 211 %. The overall economic and social development of the city affects the occurrence characteristics of the canal water microplastics. The average abundance of microplastics was positively correlated with Regional Gross Domestic Product (GDP) per capita. Wastewater treatment plant effluent is an important point source of microplastics in canal water. The microplastic abundances downstream of WWTPs increased by 21.8 % ~ 64.6 % compared with those upstream.
摘要：
微塑料,通常被认为是粒径<5毫米的人造聚合物颗粒，近年来作为新型污染物引起了人们的广泛关注。城市地区是微塑料对环境的主要贡献者，但是它们的微塑料发射强度和特性并不清楚。在本文中,研究了苏南运河的微塑料丰度和特征，以揭示沿江城市对河水中微塑料的影响。结果表明，苏南运河水体中微塑性丰度范围为3.41～19.07颗粒L-1，平均为9.59±3.95颗粒L-1，与世界主要城市群处于同一水平。前五名的聚合物是聚对苯二甲酸乙二醇酯（PET），聚碳酸酯(PC),聚乙烯(PE),氯化聚乙烯（CPE）和聚氨酯（PU）。碎片所占比例最大(68.47%),其次是珠子和纤维。大多数微塑料<100μm(83.87%)。沿江城市的人类生活和工业对苏南运河水中的微塑料做出了重要贡献。流经城市后，运河水中的微塑性丰度增加了26％〜211％。城市经济社会的整体发展影响着运河水微塑料的发生特征。微塑料的平均丰度与地区人均国内生产总值（GDP）呈正相关。污水处理厂出水是运河水中微塑料的重要点源。污水处理厂下游微塑料丰度比上游增加21.8%~64.6%。
