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Dissolved Inorganic Carbon (DIC) is one of the main chemical components in water and very sensitive with environmental changes. DIC content in river water closely relates with natural weathering process and human activities in the whole basin. Therefore, DIC concentration reflects the impact of natural conditions and human activities in the basin to river water quality. This paper presents the survey results of the DIC concentrations at 4 sites in the Red River system during the period from January 2008 to December 2015 and simultaneously considers the relationship between some environmental variables and the DIC concentrations in the river water. The survey results showed that the DIC concentrations in the Red River water varied from 9.1 to 29.9 mgC.L -1 , averaging 19.6 mgC.L -1 during the study period. The DIC concentrations are positively correlated with pH values and some major ions concentrations in river water, such as K + , Na + , Ca 2+ , SO 4 2- but negatively correlated with water temperature. These relationships also indicate that the DIC concentrations in the Red River water are influenced by natural conditions, rather than by human activities in the river basin.

Relationship of dissolved inorganic carbon (DIC) concentrations with some environmental variables in the Red River water in the period 2008 - 2015