Removal of Metal Contaminants from Contaminated Saline Waters Using an Iminodiacetic Acid Ion-exchange Resin, Thala Valley Tip, Casey Station, Antarctica

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The effect of salinity on the removal of dissolved contaminant metals from water by an Iminodiacetic acid (IDA) ion-exchange resin, Amberlite IRC748, was investigated under batch equilibrium conditions at ambient temperature. The efficiency of contaminant metal removal increased with salinity. The resin was most selective for calcium and magnesium ions at low salinity, and for contaminant metal ions at high salinity. It is proposed that a high concentration of sodium ions limits protonation of the resin, causing a shift from a chelation to an ion-exchange binding mechanism for calcium and magnesium ions.

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