Application of different methods for quality evaluation of groundwater drinking water sources: A case study of Tianjin

• Main Authors: ZHAO Xing-hua, LI Ze-li, JIA Bing-ying, WANG Ya-shu, XIAO Chuan-ning, GAO Kai, MEI Peng-yu, ZHANG Zhen
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2021-07-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: groundwater; single factor assessment; principal component analysis; water quality index valuation; tianjin
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2021/4/20210416.htm
• ISSN: 2095-6819; 2095-6819

In order to determine the spatial variation and main influencing factors of groundwater drinking water quality, a total of 202 sampling sites were studied across all the groundwater drinking water sources in five districts of Tianjin. Water samples were collected at each sampling site during the low water period and high water period in 2018, and water quality parameters were analyzed. Single factor assessment, principal component analysis, and water quality index valuation were used to identify the spatial variation and assess the water quality. The results of different evaluation methods for groundwater drinking water quality were slightly different. There were some differences among the regions in Tianjin. Overall, the water quality of rural groundwater drinking water sources in the Ninghe District and Jizhou District was better than that in Wuqing District, Beichen District, and Jinghai District. There were nine main indicators of groundwater quality in Tianjin, namely fluoride, pH, sodium, bacterial count, chroma, chlorine, oxygen consumption, nitrate nitrogen, and sulfate, and most were affected by geological factors. The results of the water quality index valuation could better reflect the actual situation of rural groundwater drinking water quality. The influence of geological factors on groundwater was inevitable. Combined with the current management of township-level drinking water sources and the characteristics of water quality, the safety of drinking water should be improved through the installation of water purification facilities.