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<p>Microplastics (MPs) have been widely detected in marine environments, yet the pollution in terrestrial fresh waters in economically underdeveloped and remote areas is poorly understood. We investigated the abundance and distribution of MPs in inland waters (including open waters in river, lake, reservoir, stream, and tap water and bottled water) in Guizhou, SW China, detected by Nile Red staining. Results show that MPs were detected in all samples, with the mean abundance of 3.5±1.9 items/mL in 34 river water samples, 3.9±1.9 items/mL in 14 lake and reservoir water samples, 3.4±2.4 items/mL in 87 stream water samples, 3.8±3.8 items/mL in 164 tap water samples, and 1.3±3.2 items/mL in 12 bottled water samples from 4 different brands. The MP abundance in open field waters (3.6±3.0 items/mL) was significantly higher than that in bottled water (1.3±3.2 items/mL) (<i>P</i>&lt;0.05). The microplastics with particle sizes of 10–20 µm accounted for more than 50% of all samples. The composition ratio of small-and medium-sized microplastics in open waters was higher than in tap and bottled water (<i>P</i>&lt;0.05). The MPs abundance tended to increase with the decrease in particle size. Therefore, microplastic pollution varied in different degrees in open waters in economically underdeveloped and remote areas of the southwestern China, which is consistent with microplastic pollution in other similar water environments. This study provided a reference for understanding the microplastic content and pollution control in the inland waters in western and remote areas of China.</p>

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On microplastics abundance in waters of Guizhou, China

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Shimin Xiong,
  • Gaofeng Bai,
  • Xubo Shen,
  • Yuanzhong Zhou

摘要

Microplastics (MPs) have been widely detected in marine environments, yet the pollution in terrestrial fresh waters in economically underdeveloped and remote areas is poorly understood. We investigated the abundance and distribution of MPs in inland waters (including open waters in river, lake, reservoir, stream, and tap water and bottled water) in Guizhou, SW China, detected by Nile Red staining. Results show that MPs were detected in all samples, with the mean abundance of 3.5±1.9 items/mL in 34 river water samples, 3.9±1.9 items/mL in 14 lake and reservoir water samples, 3.4±2.4 items/mL in 87 stream water samples, 3.8±3.8 items/mL in 164 tap water samples, and 1.3±3.2 items/mL in 12 bottled water samples from 4 different brands. The MP abundance in open field waters (3.6±3.0 items/mL) was significantly higher than that in bottled water (1.3±3.2 items/mL) (P<0.05). The microplastics with particle sizes of 10–20 µm accounted for more than 50% of all samples. The composition ratio of small-and medium-sized microplastics in open waters was higher than in tap and bottled water (P<0.05). The MPs abundance tended to increase with the decrease in particle size. Therefore, microplastic pollution varied in different degrees in open waters in economically underdeveloped and remote areas of the southwestern China, which is consistent with microplastic pollution in other similar water environments. This study provided a reference for understanding the microplastic content and pollution control in the inland waters in western and remote areas of China.