Research on dissolution kinetics of calcite and aragonite in seawater with very low saturation state and near saturation

TAO Xiao-wan; PU Xiao-qiang; WANG Hai-qiang; YUAN Zhi; ZHOU Bo

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TAO Xiao-wan, PU Xiao-qiang, WANG Hai-qiang, YUAN Zhi, ZHOU Bo. Research on dissolution kinetics of calcite and aragonite in seawater with very low saturation state and near saturation[J]. Haiyang Xuebao, 2011, 33(3): 63-73.

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Research on dissolution kinetics of calcite and aragonite in seawater with very low saturation state and near saturation

1.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
2.
Engineering College, Guangdong Ocean University, Zhanjiang 524088, China
3.
CNPC Drilling Research Institute,Beijing 100195,China

Received Date: 2009-06-15

Abstract

Abstract

The influence of variations of carbon doxide partial pressure(pCO₂) in seawater on the dissolution rate and kinetics of calcite and aragonite was studied using free-drift open reaction system which was kept at constant temperature(25.0±0.2)℃ and pCO₂(101.325 kPa). The results show that: If the pCO₂between mixture gas and reaction solution is out of balance, the deserved dissolution reaction order is smller than the actual one.The imbalance of pCO₂is the main reason for different reaction orders at different stage. In pCO₂ balance stage, the reaction order of aragonite and calcite is between 8.0 and 9.5. The reaction orders of calcite are 8.1 and 9.0 respectively with pCO₂ of 2 600×10^-6 and 320×10^-6, while for aragonite they are 9.5 and 9.0 respectively with pCO₂ of 2 600×10^-6 and 320×10^-6.When pCO₂reached a balance between the mixture gas and reaction solution, if Ω<0.75, the dissolution rate of aragonite is larger than that of calcite and if Ω>0.8 the dissolution rate of aragonite is smaller than that of calcite with the same temperature, Ω and pCO₂.
- artifical seawater,
- calcite,
- aragonite,
- dissolution,
- reaction equation,
- reaction order

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References

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