Dissolution Kinetics Of CaCO3 In Common Laboratory Solvents
Dissolution Kinetics Of CaCO3 In Common Laboratory Solvents
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DOI：
10.1306/d4267b9a-2b26-11d7-8648000102c1865d
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发表时间：
1993-07
影响因子：
2
通讯作者：
N. Pingitore;S. Fretzdorff;B. P. Seitz;L. Estrada;P. Borrego;G. M. Crawford;K. Love
中科院分区：
文献类型：
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作者：
N. Pingitore;S. Fretzdorff;B. P. Seitz;L. Estrada;P. Borrego;G. M. Crawford;K. Love
摘要对碳酸钙在有机溶剂和水溶剂中的溶解进行了定量和动力学研究。乙醇和丙酮在25°C下都不能溶解明显的文石或方解石，即使在近十天后也是如此。漂白剂（次氯酸钠）是比去离子水低得多的有效溶剂，在与碳酸钙接触的溶液中产生很少或不产生净钙。虽然暴露于氢氧化钠溶液中也产生了相对较小的钙浓度的流体中，暴露的碳酸盐颗粒的X-射线粉末衍射和光学显微镜的表征揭示了广泛的替代的CaCO 3的Ca（OH）2，氢氧化钙（钙钛矿）。AlconoxTM（一种商业实验室阴离子洗涤剂）溶液的效力约为去离子水的一半，并且过氧化氢证明对碳酸钙的腐蚀性比去离子水大许多倍。这些结果与实验室制备方案对碳酸钙影响的已发表和轶事观察结果一致。我们的定量数据允许研究人员评估使用任何这些解决方案的处理程序的可能性，以损害碳酸钙样品的完整性。
ABSTRACT The dissolution of calcium carbonate with both organic and aqueous solvents was examined quantitatively and kinetically. Neither ethanol and nor acetone at 25°C dissolved appreciable aragonite or calcite, even after nearly ten days. Bleach (sodium hypochlorite) was a much less effective solvent than deionized water, producing little or no net calcium in solutions in contact with calcium carbonate. Although exposure to sodium hydroxide solutions also yielded relatively small concentrations of calcium in the fluid, characterization of the exposed carbonate grains by X-ray powder diffraction and by light microscopy revealed extensive replacement of the CaCO3 by Ca(OH)2, calcium hydroxide (portlandite). A solution of AlconoxTM, a commercial laboratory nionic detergent, was about half again as potent as deionized water, and hydrogen peroxide proved to be many times more corrosive of calcium carbonate than deionized water. These results are consistent with published and anecdotal observations of the effects of laboratory preparation protocols on calcium carbonate. Our quantitative data permit the researcher to assess the potential for a treatment procedure using any of these solutions to compromise the integrity of a sample of calcium carbonate.