Abstract
The present paper provides a calibration of the Beer-Lambert law allowing the determination of the ammonium (NH4) content of biotite using infrared (IR) spectroscopy. Single biotite crystals were analyzed by Fourier Transform Infrared spectroscopy. Using a linear correlation between the NH4 infrared absorption band intensity and the NH4 content as determined by vacuum techniques, the NH4 molar absorption coefficient at 1430 cm-1 was found to be 441 ± 31 L/mol·cm. After having calibrated the biotite thickness to Si-O absorption band, the NH4 content of biotite can be calculated directly from its IR spectrum by the relation:
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