Speciation of Trace Metals in Waters: Direct Selective Separation and Preconcentration of Free Metal Ion by Supported Liquid Membrane

Article Article scientifique Article Speciation of Trace Metals in Waters: Direct Selective Separation and Preconcentration of Free Metal Ion by Supported Liquid Membrane eng 1999 author Parthasarathy Nalini 24785 author Buffle Jacques 24673 author Gassama Nathalie 93847 author Cuenod François 113429 455-470 0009-2223 The potentiality of species-selective supported liquid membrane device (SLM) for trace metal measurements under natural water conditions has been investigated. Cu(II) speciation studies with various synthetic hydrophilic ligands (sulphosalicylic acid, hydroxyquinoline sulphonic acid and oxalic acid) and natural ligands such as fulvic acids were done using 1,10-didecyl-1,10-diazacrown ether -lauric acid/phenyl hexane-toluene on flat and hollovv fibre supported liquid membranes. The salient features of the results obtained are that only free metal ions are transported across this SLM and the negatively charged complexes and neutral complex do not pass through within the time scale of the measurement. Low free metal concentrations can be measured and most importantly the experimentally observed values of degree of complexation(α<sub>s</sub>) are in good agreement with the theoretically calculated ones, the correlation, coefficient being 1.01± 0.02. These findings suggest that SLM can be used as an alternative method for speciation studies in natural waters. Speciation Trace metal analysis Separation Preconcentration Trace metal Ion Dewey 540 40 Département de chimie minérale, analytique et appliquée 145 false Chemia Analityczna 44 2962f86b-b357-414f-bba8-b488ee9df8b6 Article (Published version) Public CHAN1999V0044P00455.pdf 905675 application/pdf openAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

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Speciation of Trace Metals in Waters: Direct Selective Separation and Preconcentration of Free Metal Ion by Supported Liquid Membrane	Chemia Analityczna			1999	148	191

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Cuenod, François