Arends J, Davidson C L
Calcif Tissue Res. 1975 Jul 4;18(1):65-79. doi: 10.1007/BF02546227.
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.
测定了健康牙釉质以及从人工龋损处采集的材料中HPO₂⁻₄和CO₂⁻₃的含量。所述方法表明，如果对CO₂⁻₃的贡献进行校正，可从875 cm⁻¹红外吸收带测定HPO₂⁻₄的含量。红外光谱显示，健康人牙釉质或牛牙釉质中HPO₂⁻₄的含量约为5%（重量）。在人工龋损（pH = 4.0）中，HPO₂⁻₄的含量约为15%（重量）。很可能，健康牙釉质和龋损牙釉质中的HPO₂⁻₄离子所处环境不同。
