Frost Ray L, Reddy B Jagannadha, Bahfenne Silmarilly, Graham Jessica
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Apr;72(3):597-604. doi: 10.1016/j.saa.2008.10.043. Epub 2008 Nov 7.
The proposal to remove greenhouse gases by pumping liquefied CO(2) several kilometres below the ground implies that many carbonate containing minerals will be formed. Among these minerals brugnatellite and coalingite are probable. Two ferric ion bearing minerals brugnatellite and coalingite with a hydrotalcite-like structure have been characterised by a combination of infrared and near-infrared (NIR) spectroscopy. The infrared spectra of the OH stretching region are characterised by OH and water stretching vibrations. Both the first and second fundamental overtones of these bands are observed in the NIR spectra in the 7030-7235 cm(-1) and 10,490-10,570 cm(-1) regions. Intense (CO(3))(2-) symmetric and antisymmetric stretching vibrations support the concept that the carbonate ion is distorted. The position of the water bending vibration indicates the water is strongly hydrogen bonded in the mineral structure. Split NIR bands at around 8675 and 11,100 cm(-1) indicate that some replacement of magnesium ions by ferrous ions in the mineral structure has occurred. Near-infrared spectroscopy is ideal for the assessment of the formation of carbonate minerals.
通过将液化二氧化碳泵入地下数公里来去除温室气体的提议意味着将形成许多含碳酸盐矿物。其中，水碳镁铁矿和库林钙石很可能会形成。两种具有水滑石状结构的含铁离子矿物——水碳镁铁矿和库林钙石，已通过红外光谱和近红外光谱（NIR）的组合进行了表征。OH伸缩区域的红外光谱以OH和水的伸缩振动为特征。这些谱带的第一和第二泛音在近红外光谱的7030 - 7235 cm⁻¹和10490 - 10570 cm⁻¹区域中均有观测到。强烈的（CO₃）²⁻对称和反对称伸缩振动支持了碳酸根离子发生畸变的概念。水弯曲振动的位置表明水在矿物结构中形成了强氢键。在8675和11100 cm⁻¹左右出现的近红外谱带分裂表明矿物结构中部分镁离子被亚铁离子取代。近红外光谱对于评估碳酸盐矿物的形成非常理想。
