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- Noresson, B, et al.
(författare)
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Effects of capacity on the preconcentration of trace metals and matrix elimination by an iminodiacetate chelating adsorbent
- 1998
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Ingår i: Talanta. - 0039-9140. ; 46:5, s. 1051-1063
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Tidskriftsartikel (refereegranskat)abstract
- Low capacity adsorbents, based on iminodiacetic acid and a crosslinked agarose, Novarose(TM), have been synthesised for the enrichment of metal ions. Test ions Cu2+ with high, and Cd2+ with a moderate affinity for the sorbent were selected. The study includes the effect of specific capacity and matrix composition on the rate of uptake and recovery of these ions. Using a column packed with 0.25 ml of a sorbent and a sample volume of 100 ml, Cu2+ is quantitatively accumulated from all of the matrices studied even at a capacity of 6 mu mol ml(-1) of adsorbent and a flow rate as high as 100 ml min(-1). The enrichment of Cd2+ is affected by the matrix and for quantitative recovery the flow rate and capacity must be properly adjusted. In the presence of 0.01 M Ca2+, a specific capacity of 45 mu mol ml(-1) is needed for quantitative retainment and a flow rate of 100 ml min(-1), whereas a capacity of 10 mu mol ml(-1) suffices at 10 ml min(-1). The advantage of low specific capacity on the removal of matrix elements has been demonstrated. A method based on the determination of conditional stability constants of the metal sorbent complex is suggested for predicting the sorbent capacity needed to acquire quantitative recovery and optimal matrix elimination.
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