State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China.
Institute of Marine Sciences, University of Chittagong, Chittagong 4331, Bangladesh.
Mar Pollut Bull. 2022 Jul;180:113820. doi: 10.1016/j.marpolbul.2022.113820. Epub 2022 Jun 9.
The Karnafullly River, which flows through Chattogram and falls into the Bay of Bengal, Bangladesh, is vulnerable to microplastic contamination. In this study, we looked at microplastics in the Karnafully River's surface water (5 sites), sediment (9 sites), and biota (4 species). Microplastic concentrations ranged from 0.57 ± 0.07 to 6.63 ± 0.52 items/L in surface water, 143.33 ± 3.33 to 1240 ± 5.77 items/kg dry weight in sediment, and 5.93 ± 0.62 to 13.17 ± 0.76 items/species in biota. A significant difference (P < 0.05) was found in the concentration of MPs in the Karnafully River's sediment, biota, and surface water. High percentage of fiber-shaped and small-sized MPs (<1 mm) were detected throughout the samples. Water and sediment MPs were often transparent/white and blue, whereas biota MPs were mostly black and red, indicating a color preference during biological uptake. The Bay of Bengal received 61.3 × 10 microplastic items per day. The feeding zone of biota influenced the level of microplastics, with a trend of pelagic > demersal > benthic > benthopelagic. Polyethylene and polyethylene terephthalate were the most abundant polymer. Using the average fish intake rate in Bangladesh, we computed a possible consumption of 4015-7665 items of MPs/person/year.
卡纳夫利河（Karnafully River）流经吉大港（Chattogram），最终流入孟加拉湾（Bay of Bengal），该河流易受到微塑料污染。本研究调查了卡纳夫利河地表水（5 个地点）、沉积物（9 个地点）和生物群（4 个物种）中的微塑料。微塑料浓度范围为地表水 0.57±0.07 至 6.63±0.52 个/升，沉积物 143.33±3.33 至 1240±5.77 个/千克干重，生物群 5.93±0.62 至 13.17±0.76 个/物种。卡纳夫利河沉积物、生物群和地表水的 MPs 浓度存在显著差异（P<0.05）。样品中纤维状和小尺寸（<1 毫米）的 MPs 占比很高。水和沉积物中的 MPs 通常为透明/白色和蓝色，而生物群中的 MPs 主要为黑色和红色，表明在生物摄取过程中存在颜色偏好。孟加拉湾每天接收 6130 万个微塑料颗粒。生物群的摄食区影响微塑料水平，趋势为浮游>底栖>底内>底上。最丰富的聚合物是聚乙烯和聚对苯二甲酸乙二醇酯。根据孟加拉国鱼类平均摄入量，计算出每人每年可能摄入 4015-7665 个微塑料颗粒。
