The calcium holding capacity of FECa was identified and confirmed using AAS. 
AAS
Ion complexation of FECa was characterized using 1H-NMR, UV, SEM and EDS, and FTIR. 
1H-NMR
Ion complexation of FECa was characterized using 1H-NMR, UV, SEM and EDS, and FTIR. 
UV
Ion complexation of FECa was characterized using 1H-NMR, UV, SEM and EDS, and FTIR. 
SEM
Ion complexation of FECa was characterized using 1H-NMR, UV, SEM and EDS, and FTIR. 
EDS
Ion complexation of FECa was characterized using 1H-NMR, UV, SEM and EDS, and FTIR. 
FTIR