Fig. 3. X-ray diffraction patterns of phosphatic clay before Pb sorption (A) and after Pb sorption (B). Mineral abbreviations: s (smectite), pa (polygorskite), k (kaolinite), q (quartz), py (pyromorphite), and a (apatite).
Fig. 3. X-ray diffraction patterns of phosphatic clay before Pb sorption (A) and after Pb sorption (B). Mineral abbreviations: s (smectite), pa (polygorskite), k (kaolinite), q (quartz), py (pyromorphite), and a (apatite).