The spatiotemporal variations characteristic and pollution evaluation of water quality in Qujiang River, China

Abstract In order to study the spatiotemporal variations characteristic of water quality and potential pollution sources Qujiang River, data twelve parameters at three monitoring sections (Tuanbaoling, Baita, Sailong) from 2015 2019 were analyzed by using comprehensive index (CPI) multivariate statistical techniques (MST). The River basically meet class 3 value environmental standards for surface (GB3838-2002, China). CPI varies 0.62 1.06 is characterized slight sections. Cluster analysis (CA) results show that months can be divided into groups on basis similarities characteristics: Group 1 (dry season), which includes January-April November–December; 2 (flood is, July; (flat consists May–June August–October. Principal component (PCA) identify four principal components (PCs) dry season flood season, five PCs flat thus explaining 58.23%, 82.94%, 73.23% total variance, respectively. independent sample t-test significant differences among pH, Permanganate (COD Mn ), Ammonia nitrogen (NH –N), Total (TN), Fecal coliform (F. coli (Flow) Q in Moreover, more serious Baita than Tuanbaoling Sailong Section main problem high organic nutrient pollutant content. Hence, protection need strengthened section River.