Table 2: Sample Notations

Samples Time of Soaking in Days
4 6 8 10
Sr-c-SBF Sr-2p* Sr-3p Sr-4p Sr-5p
Zn-c-SBF Zn-2p Zn-3p Zn-4p Zn-5p

* p stands for period, each last for 2 days after which the solution was replenished with freshly prepared one.