Chemical Characteristics and Genesis of Major Ions in the Pearl River Basin

Abstract:

According to water chemistry data from 1959 to 1984 at 109 monitoring stations collected from the water yearbook edited by the Water Conservancy Ministry of China, the chemical characteristics and genesis of major ions of the Pearl River System were investigated. The results are as follows. The contents of total dissolved solids in the Dongjiang River are relatively low (about 66.1mg/L) and the hydro-chemical type is C^Na . The contents of total dissolved solids in the Xijiang River are relatively high (about 202.5mg/L) and the hydro-chemical type is C^Ca , and those of the Beijiang River are between these of Dongjiang and Xijiang. The ionic runoff modules in pearl River Basin are much higher than those in the other river basin of China. The composition of major ions in the Dongjiang is dominated by the weathering of alumno-silicates stones and the ionic composition in the Xijiang is dominated by the leaching of limestones.

Key words:

Chinese river; Pearl River; water chemistry; ionic runoff modulus

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