HPO2-4 content in enamel and artificial carious lesions.
The HPO2-4 and CO2-3 content was determined in sound enamel and in material collected from artificially produced carious lesions.  The method described shows that the HPO2-4 content can be determined from the 875 cm(-1) infrared absorption band if correction for the CO2-3 contribution are made.  The I.R. spectra show that the HPO2-4 content in sound human or bovine enamel is about 5% by weight.  In artificially produced carious lesions (pH=4.0), the HPO2-4 content is in the order of 15 wt%.  Most likely, the HPO2-4 ions in sound and carious enamel have a different enviroment.
D000818:Animals; D000838:Anions; D001031:Apatites / Q000032:analysis; D002254:Carbonates / Q000032:analysis; D002417:Cattle; D003731:Dental Caries / Q000378:metabolism*; D003743:Dental Enamel / Q000032:analysis*; D010756:Phosphoric Acids / Q000032:analysis*; D013053:Spectrophotometry
D000838:Anions; D001031:Apatites; D002254:Carbonates; D010756:Phosphoric Acids