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Analysis of Release of Ions into Deionized Water From Raw and Acid Washed (AW) Fluoroaluminosilicate Glasses by Using Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES)

Shahab Ud Din, Muhammad Hassan, Mohtada Hassan, Bilal Ahmed Sheiks and Richard Billington

Aims and objectives: To evaluate the release of ions into deionized water from fluoroalumino silicate glasses (LG26Sr) before and after acid wash and to determine the effect of acid wash on the glasses. Materials and methods: Specimens of fluoroalumino silicate glasses (experimental glasses; LG26Sr raw and acid washed) were stored in polyethylene (PE) tubes at 37°C in deionized water for a time period of 28 days. Glass free solutions were collected after 1, 3, 7, 14, 21 and 28 days. The cumulative ions release from the glasses from 24 hours to 28 days was calculated to compare the pattern of ions release in deionised water. The ions released were analysed by using Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES). ICPOES has the ability to perform multi-element analysis simultaneously to determine the concentration of ions in aqueous solutions. Results and discussion: (a) The ions released from the fluoroalumino silicate glasses (experimental glasses; LG26Sr raw and acid washed) were observed at all-time points. It was seen that the release of ions decreased over time and there was minimal amounts of ion released in week four. (b) Acid washed glasses increased the amount of release of fluoride (F) and aluminium (Al) ions while the releases of strontium (Sr) ions were decreased. (c) The acid washing of the glasses demonstrated the higher amounts of release of F ions compared to Al ions. Although the amount of Al is increased after acid wash but it was too low as compared to F ions. (d) Immediately after week 3 the release of Al ions from raw glasses were decreased. Conclusion: (a) Considerable amounts of ions were released from both the glasses (raw and acid washed) into deionized water throughout the experimental period. (b) The release of ions was decreased after reaching a peak value and minimal quantities were released in week four. (b) F and Al ions were released more from AW glasses as compared to raw glasses. (c) Release of Al ions were suddenly dropped in week 4. (d) Release of Sr ions were greater from raw than AW.