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Volume 40 Issue 4
Aug.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(4): 572-579
WANG Wuyan, LI Qingguang. Buffering effect of chemical equilibrium of CaCO3—CO32-—HCO3-—CO2 on CO2 in freshwater carbonate lake：A case study of Baihua lake, Guizhou[J]. CARSOLOGICA SINICA, 2021, 40(4): 572-579.
Citation: WANG Wuyan, LI Qingguang. Buffering effect of chemical equilibrium of CaCO3—CO32-—HCO3-—CO2 on CO2 in freshwater carbonate lake：A case study of Baihua lake, Guizhou[J]. CARSOLOGICA SINICA, 2021, 40(4): 572-579.
shu

Buffering effect of chemical equilibrium of CaCO3—CO32-—HCO3-—CO2 on CO2 in freshwater carbonate lake：A case study of Baihua lake, Guizhou

  • 1.

    College of Chemistry and Chemical Engineering，Xiamen University

  • 2.

    College of Resources and Environmental Engineering，Guizhou University

  • Publish Date: 2021-08-25
    Abstract
  • CO2 can be absorbed by water and transformed into HCO3-. This process is well known as the buffering of carbonate system，which can be quantified using the Revelle factor（R）. CO2 released by terrestrial freshwater systems is an important component of the global carbon cycle. On the one hand，CO2 released by lake water is from the input of carbonate weathering products in the basin；on the other hand，the buffering effect of carbonate is an important factor regulating CO2 release of inland water. These two conclusions seem to be contradictory. In order to reveal the effect of carbonate cycling on CO2 in freshwater lakes，in this study， we investigated the variation of Revelle factor R in a stratified lake（Baihua lake）located in carbonate area，and compared to the data obtained from lakes from non-karst areas. The results show that the average of Revelle factor in the lake water is 20.1± 8.1（8.0-50.0），which is larger than 10.0（8.0-15.0）in the surface sea water and also much larger than 3.9±3.9 in lakes in non-karst areas. A higher Revelle factor means a weaker CO2 buffering capacity. The maximum value of R，46.4，occurred in the thermocline in summer，where corresponding variations of inorganic carbon concentration（2.1 mmol?L-1），ratio of total inorganic carbon to alkalinity（1.0），ratio of CO2/CO3（1.0）and pH （8.38）are well coincident with the theoretical values. This consistency indicates that chemical equilibrium of carbonate is primary factor controlling Revelle factor of lake water. Lake waters with lower pH in non-karst areas could dissolve carbonate and then raise pH and alkalinity，thus elevate the Revelle factor to the maximum value while dissolution of carbonate reaches an equilibrium. Thereafter，Revelle factor will decrease and the buffering capability resulted by the metabolism increase，regardless of carbonate precipitation due to photosynthesis or carbonate dissolution during respiration.

     

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