Figure 7.
FTIR analysis of encrustations formed in the in vitro-encrustation system. Measured absorption spectra (red) of mineral deposits of the synthetic urine without polymer (a) or the precipitations on the polymer samples (Elastollan: b, Tecophilic: c). Absorption spectra of the OPUS™ reference library with the best match are shown in purple, black, and blue, respectively. The amount of calcium phosphate (carbonate apatite and whitlockite) precipitates is higher on Elastollan. In contrast, on Tecophilic, the amount of magnesium phosphates (struvite) is elevated compared to complete urine precipitates. (ALPHA FTIR spectrometer, OPUSTM library, Bruker).