Salinity-enhanced release of trace metals from sandstone and variations in mineral compositions after water-rock interactions in the presence of supercritical CO 2

Jiin Shuh Jean, Huan Wen Lin, Zhaohui Li, Huai Jen Yang, Hsing I. Hsiang, Kenn Ming Yang, Chien Li Wang, Yun Hwei Shen, Chun Chih Kuo, Wen Chin Kuo

研究成果: Article

摘要

This research is aimed toward an understanding of the effects of the chemical characteristics and mineral compositions of sandstone and formation water based on saline water-rock-supercritical CO 2 interaction simulation experiments. These experiments were conducted to assess whether toxic trace elements could be dissolved and released in formation water from sandstone in a CO 2 storage layer after CO 2 geological sequestration, thus affecting groundwater quality. The experimental results reveal that the concentrations of Cd and Pb in the water under examination exceeded the national primary drinking standard as a result of saline/fresh water-rock-supercritical CO 2 interactions after 40 d of sandstone immersion in saline/fresh water and 20 d of interaction. In addition, the Mn concentration in the saline/fresh water exceeded the national secondary drinking standard after 40 d of sandstone immersion and 20–80 d of interaction. However, Cd, Pb, and Mn were released to a greater extent (in terms of concentration, 2-fold for Cd, 7-fold for Pb, and 1.7-fold for Mn) in the presence of salinity, revealing that salinity may enhance the dissolution of Cd, Pb, and Mn after 20 d of saline water-rock-scCO 2 interaction. After a long period of supercritical CO 2 -sandstone interaction, the trace metals previously mobilized can be immobilized again by an increase in alkalinity due to aragonite dissolution.

原文English
頁(從 - 到)639-648
頁數10
期刊Aerosol and Air Quality Research
19
發行號3
DOIs
出版狀態Published - 2019 三月

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution

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