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01-09-2020 | Original Article | Issue 18/2020

Environmental Earth Sciences 18/2020

Characteristics of soil CO2 under different conditions and its influence on water chemical composition: an experimental and modeling study in the laboratory

Journal:
Environmental Earth Sciences > Issue 18/2020
Authors:
Zongjun Gao, Hongying Zhang, Mengjie Shi, Shaoyan Fang, Yechen Cui, Jiutan Liu
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Abstract

The water quality of the rainwater is obviously different from that of the groundwater after it reaches the surface and passes through the vadose zone. This study aims to further evaluate and analyze how soil CO2 changes under natural conditions, to provide a theoretical background for the establishment of CO2 geological storage, and to provide a basis for the detection of CO2 leakage in order to provide insights for expanding CO2 research. The changes in soil CO2 concentration under different conditions were simulated and analyzed by laboratory experiments, and the effects of CO2 on water chemical composition were also analyzed. In this study, two experimental groups (vegetation group (V) and high-temperature sterilization group (R)) and one blank group (B) were established. The results showed that the CO2 concentration in column R was the lowest, while that in column V was the highest. With rainfall infiltration, soil CO2 concentration gradually increased. When the rainwater infiltrated to 215 cm, the CO2 concentrations in the columns V, B, and R were 5100 mg·m−3, 4450 mg·m−3, and 32,000 mg·m−3, respectively. At infiltration depths from 5 to 215 cm, the Na+, Ca2+, Mg2+, SO42−, and HCO3 concentrations in columns V and B decreased, whereas they increased in soil column R. The simulation revealed that the CO2 concentration ranged from 560 mg·m−3 to 50,000 mg·m−3; pH value decreased; NO3 and Cl remained stable; SO42− decreased; and fCO2, HCO3, Ca2+ and Mg2+ increased.

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