SURFACE CHEMISTRY TRACKING OF SiO2 PRODUCT OF PSTA-ZIRCONIUM PURIFICATION TECHNOLOGY FACILITY. Surface chemistry tracking of SiO2 product of PSTA-Zirconium Purification Technology Facility had been done. The objective of the investigation is to track the functional groups of xylanol (≡Si-OH), siloxane (≡Si-O-Si≡) as well as water (OH) at the surface product of SiO2 gel. The processing parameters conducted were temperature, time and concentration of HF acid. Tracking of SiO2 gel was conducted by using Fourier-transform infrared (FT-IR) spectroscopy and the detection of Fe 3+ impurities desorption using atomic absorption spectroscopy (AAS). The maximum purification product of