Hydrochemical Characteristics and Ion Source Analysis of the Yarlung Tsangpo River Basin

In order to investigate the hydrochemical characteristics and their controlling factors, 212 water samples from Yarlung Tsangpo River its tributaries were collected over three precipitation periods in 2018 analyzed using mathematical statistics, Gibbs ion ratio methods, principal component analysis. The results showed following: (1) cations mainly Ca2+, Na+ Mg2+, anions HCO3− SO42− predominant, accounting for more than 97% of total anion concentrations. concentration dissolved solids (TDS) was 204.51 mg/L. chemistry type SO4·(HCO3)−Ca·(Mg) water. (2) concentrations major ions fluctuate, but general, vast majority follow trend both first increasing then decreasing periods. features Basin have seasonal differences. (3) model PCA analyses that chemical components are affected by rock weathering. addition, influence mining industry also plays an important role. heavy metal could reach standard first-class surface quality.