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Manuscript prepared for submission to environmental toxicology and pharmacology pollution in drinking water source areas: Microplastics in the Danjiangkou Reservoir, China
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Researchers investigated microplastic contamination in surface water and sediments of the Danjiangkou Reservoir, the source area for China's South-to-North Water Diversion Project, finding microplastics in all samples at abundances ranging from 467 to 15,017 particles/m3 in water and 15 to 40 particles/kg in sediment. Fibrous particles smaller than 2 mm dominated, with micro-Raman spectroscopy identifying polypropylene as the primary polymer type.
As the source of water for the South-to-North Water Diversion Project of China, the water quality of the Danjiangkou Reservoir (DJKR) is related to the safety of drinking water for billions of residents. Consequently, microplastics in surface water and sediment samples of the DJKR were investigated in this study. Microplastics were observed in all water and sediment samples with abundances varying from 467 to 15,017 n/m and 15 to 40 n/kg wet weight, respectively. Microplastics were rich in colour and dominated by fibrous items. Small-sized particles (< 2 mm) were more frequently observed than other sizes. Analysis by micro-Raman spectroscopy showed that polypropylene was the major polymer type. These systematic results demonstrated that the DJKR is suffering from the pollution of microplastics, which should be paid more attention based on its potential threat to the aquatic organisms and residents impacted by the drinking water source pollution.
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