ICP-OES was also used to further confirm the presence of silver ions in the structure and to measure the silver to zinc ratio, as can be seen in Table 3. The ratio of silver to zinc ions was shown to be around 0.5:1, which is very similar to the zinc to silver ratio during the adsorption process. Although the ratio calculated via ICP is slightly higher than the calculated ratio during adsorption, the difference is reasonably small and may have arisen from systematic and random errors throughout the experimental synthesis process. This shows that the silver adsorption into the structure was reasonably effective.