期刊
TALANTA
卷 59, 期 4, 页码 831-836出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-9140(02)00638-0
关键词
FT-IR; calcite; aragonite; vaterite; quantitative analysis; synthetic calcium carbonate
Fourier Transform Infrared Spectroscopy (FT-IR) was used successfully for the simultaneous quantitative analysis of calcium carbonate phases (calcite, aragonite, vaterite) in ternary mixtures. From the FT-IR spectra of pure calcite, aragonite and vaterite powders with KBr, the absorptivities, alpha, of the absorption bands at 713 cm(-1) for calcite, 745 cm(-1) for vaterite, 713 and 700 cm(-1) for aragonite, were determined. In order to overcome the absorption band overlapping a set of equations based on Beer's law was developed. The detection limits were also established and found to be 1.1 x 10(-4) mg calcite per mm(2) of pellet at 713 cm(-1), 3.6 x 10(-4) mg aragonite per mm(2) of pellet at 700 cm(-1), 1.8 x 10(-4) mg aragonite per mm(2) of pellet at 713 cm(-1) and 3.1 x 10(-4) mg vaterite per mm 2 of pellet at 745 cm(-1). Analysis of a known ternary mixture of calcium carbonate polymorphs tested the validity of the method. (C) 2003 Elsevier Science B.V. All rights reserved.
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