Abstract
The transport of Cu2+ through a supported liquid membrane (SLM) consisting of 1,10-didecyldiaza-18-crown-6, a fatty acid and a mixture of toluene and phenylhexane (1 + 1) under natural water conditions was studied. Long-chain fatty acids having various numbers of carbon atoms Cn (n = 10-18) were tested to obtain a reasonably high Cu2+ transport rate. The rate of transport of Cu(II) was found to be fast when lauric acid (n = 12) was included in the membrane phase. The transport Cu2+ by the SLM in the presence of Cu(II) complexants such as Tiron and oxalate was investigated. The results showed that the flux of Cu(II) through the membrane depends specifically on the free metal ions. These results were verified by means of a Cu(II) ion=selective electrode. The SLM was applied to the determination of Cu2+ in fresh waters and the results were compared with those obtained by ultrafiltration.
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