Journal of Shandong University (Health Sciences) ›› 2021, Vol. 59 ›› Issue (12): 58-62.doi: 10.6040/j.issn.1671-7554.0.2021.1068

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Distribution of microplastics in drinking water in Qingdao

CHAI Ran, ZHANG Xiuqin, XU Chunsheng, WANG Yin, PAN Lu, WANG Bingling, DUAN Haiping   

  1. Department of Environmental Health, Qingdao Municipal Center for Disease Control and Prevention;
    Qingdao Institute of Preventive Medicine, Qingdao 266033, Shandong, China
  • Published:2021-12-29

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Abstract: Objective To explore the distribution of microplastics in drinking water in Qingdao. Methods Altogether 32 tap water samples were collected from different water sources and 500 mL of each sample was used for analysis. The type, particle number and size of microplastics were analyzed with laser direct infrared imaging(LDIR). Results Microplastics were detected in 25 samples(78.1%). The maximum value of microplastics in all samples was 360/L, and the M(P25,P75)was 18(2.5,91.5)/L. Among the 25 samples with microplastics detected, 2 with abundance higher than 300 particles/L were from urban surface water; 8 with abundance less than the median were from rural tap water. The highest detection rate 81.8%(9/11)of microplastics was found in urban surface water. The 8 types of microplastics detected included polyamide(PA), polyethylene terephthalate(PET), polystyrene, polypropylene, polyurethane, polyoxymethylene ester, polyvinyl chloride and polysulfone. PET showed the highest proportion(85.8%), followed by PA(8.5%). The abundance of microplastics in drinking water decreased with the increase of particle size. Particles 0-30 μm in size had the highest proportion(49.7%), followed by 30-50 μm(28.4%), 50-100 μm(15.7%)and 100-300 μm(6.1%). Conclusion The abundance and proportion of microplastics in tap water from different sources are different in Qingdao, of which the urban areas are higher than the rural areas. PET products, as the main source of microplastics in drinking water, should arouse due attention.

Key words: Microplastics, Drinking water, Laser direct infrared imaging, Abundance, Particle size

CLC Number: 

  • R123.1
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