Fig. 12

Energy X-ray dispersive spectroscopy (SEM–EDS) of MICP treated Blessington and Ottawa F-110 sand for comparison of precipitated calcite morphology. (A,B) SEM view and SEM–EDS layered image, respectively, of MICP treated Blessington sand showing the detected elements. (C,D) Silicon and Calcium element map scan, respectively, of MICP treated Blessington sand show in (A,B). (E–F) SEM view and SEM–EDS layered image, respectively, of MICP treated Ottawa F-110 sand showing the detected elements. The difference in precipitated calcite morphology on natural carbonate and silica particles can be observed from SEM–EDS and elemental scans.