Abstract
The HPO 2−4 and CO 2−3 content was determined in sound enamel and in material collected from artificially produced carious lesions. The method described shows that the HPO 2−4 content can be determined from the 875 cm−1 infrared absorption band if correction for the CO 2−3 contribution are made. The I. R. spectra show that the HPO 2−4 content in sound human or bovine enamel is about 5% by weight. In artificially produced carious lesions (pH=4.0), the HPO 2−4 content is in the order of 15 wt%. Most likely, the HPO 2−4 ions in sound and carious enamel have a different environment.
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