Journal of Shandong University (Health Sciences) ›› 2021, Vol. 59 ›› Issue (12): 50-57.doi: 10.6040/j.issn.1671-7554.0.2021.1217

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Spatiotemporal distribution characteristics of nitrates and health risks in drinking water in Zibo City

LIU Fangying1,2,3, ZHAO Zhiqiang1,2,3, MENG Chao1,2,3, WANG Dan1,2,3, LI Ping1,2,3, LIU Xiaoli1,2,3, ZHANG Dianping1,2,3, WANG Qin1,2,3, WANG Min1,2,3   

  1. 1. Zibo Center for Disease Control and Prevention, Zibo 255026, Shandong, China;
    2. Key Laboratory of Environmental Organic Pollution and Human Health Monitoring and Analysis, Zibo 255026, Shandong, China;
    3. Joint Office of Environmental and Health of Shandong University-Zibo Center for Disease Control and Prevention, Jinan 250012, Shandong, China
  • Published:2021-12-29

Abstract: Objective To conduct health risk assessment of nitrate in drinking water, and provide technical basis for water quality intervention. Methods In 2016-2020, nitrate content in 2,575 urban and rural drinking water samples were tested. Based on "Technical Guidelines for Environmental Health Risk Assessment of Chemical Substances"(WS/T 777-2021), spatiotemporal distribution characteristics of nitrate content and non-carcinogenic health risks were analyzed in different years, types, water sources, and water treatment methods. Results A total of 2,575 water samples were tested in 2016-2020, and the exceeding standard rate of the nitrate was 10.76%. The nitrate content of drinking water was spatially agglomerated. The high values were mainly concentrated in the middle and east of Yiyuan County and the southwest of Boshan District, while the low values were concentrated in Gaoqing and Huantai Counties. Nitrate content and non-carcinogenic health risks of drinking water were generally increasing year by year, with rural water higher than urban water, groundwater higher than surface water, and untreated water higher than treated water. The 5-year overall average non-carcinogenic risk was 0.21, with the relatively low non-carcinogenic risk; the highest non-carcinogenic risk was 1.99, and the areas with the highest non-carcinogenic risk value higher than 1 were mainly concentrated in Yiyuan County, which has long-term non-carcinogenic risk to humans. Conclusion Nitrate pollution in drinking water is serious in some areas of Zibo City, and there is a non-carcinogenic health risk. It should be paid attention to and water quality intervention measures should be taken.

Key words: Drinking water, Nitrate, Health risk, Spatiotemporal distribution

CLC Number: 

  • R123
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