Hydrochemical characteristics and sources of Nanpanjiang and Beipanjiang river basins during dry seasons
MA Kuo
WU Qixin
HAN Guilin
DONG Aiguo
Abstract：Water samples were collected in dry seasons to analyze the hydrochemical components of Nanpan-jiang and Beipanjiang basins,the upper reaches of the Pearl River.The results show that pH values of the water from the two catchments,ranges from7.85 to 8.75 during dry seasons,slightly alkaline,with an aver-age TDS of 358 mg·L-1 .The anions are dominated by HCO -3 and SO 2 -4 with the mean equivalent concen-tration accounting for 65％ and 26％ of the total anions,respectively.The main cations are Ca2 + and Mg2 + , accounting for 65％ and 24％ of the total cations,respectively.Compared with the research about the con-centrations of major ions in wet seasons,the concentrations of Ca2 + ,Mg2 + ,Na+ ,SO 2 -4 ,HCO -3 ,and Cl-in dry seasons are higher,while K+ and NO -3 contents almost remain the same.Piper diagrams,end mem-bers of lithology and ion concentration ratios collectively indicate that the chemical composition of river water is mainly controlled by carbonate weathering where sulfuric acid and carbonic acid both participate.Nanpan-jiang and Beipanjiang are all influenced by agricultural activities.In addition,Beipangjiang is mainly affected by coal mining and coal-combustion industry,while Nanpanjiang is mainly affected by wastewater from in-dustries at upper reach and the cities and towns along the river.Compared with previous data,it is found that the impact of anthropogenic activities on water has increased over the past 15 years.
Keywords：Nanpanjiang and Beipanjiangwater chemistryion sourcesanthropogenic activitiesrock weathering
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 192-202 )