water Article Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China Yilei Yu 1,2 , Xianfang Song 3,*, Yinghua Zhang 3 and Fandong Zheng 4 1 Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China;
[email protected] 2 Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China 3 Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
[email protected] 4 Beijing Water Science and Technology Institute, Beijing 10048, China;
[email protected] * Correspondence:
[email protected]; Tel.: +86-010-6488-9849 Received: 3 August 2020; Accepted: 10 September 2020; Published: 12 September 2020 Abstract: Dry rivers could be effectively recovered by reclaimed water in North China, while river water quality would be an important issue. Therefore, it is important to understand the spatiotemporal variation and controlling factors of river water. Water samples were collected during March, May, July, September, and November in the year 2010, then 20 parameters were analyzed. The water environment was oxidizing and alkaline, which was beneficial for nitrification. Nitrate was the main nitrogen form. Depleted and enriched isotopes were found in reclaimed water and river water, respectively. Total nitrogen (TN) and total phosphorus (TP) of reclaimed water exceed the threshold of reclaimed water reuse standard and Class V in the surface water quality criteria. Most river water was at the severe eutrophication level. The sodium adsorption ratio indicated a medium harmful level for irrigation purpose.