"Potentiometric Flow Injection Determination Of Cadmium In Waste Waters Including Inline Ion-exchange Separation/concentration"
Anal. Chim. Acta
1998 Volume 366, Issue 1-3 Pages 155-161
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Cristina M. C. M. Coutoa, José L. F. C. Limaa, M. Conceição B. S. M. Montenegroa, Boaventura F. Reisb and Elias A. G. Zagattob,*
Abstract:
A flow injection system including an ion exchange resin mini-column was proposed for potentiometric determination of Cd in wastewater. Cd was preferential and quantitatively retained as chloro-complex by a strongly basic anion exchange resin (AG 1-X8, 200-400 mesh, chloride form) mini-column (2.0 cm height, 1.85 mm inside diameter), whereas other sample metallic cations and inert components were wasted. Retained complexes were further eluted towards detection. The flow-through detector was a Cd homogeneous crystalline double membrane tubular electrode of increased sensitivity; summation of the potentials related to each membrane was performed using an external electronic device. This system was used to determine Cd in residual wastewater; Cd concentrations were 0.056-56.2 mg/L. Precise results (relative standard deviation ~7%) in agreement with those obtained by flame atomic absorption spectrometry were obtained at a rate of 15-20 determinations/h.
Cadmium
Waste
Complexation
Resin
Preconcentration
Method comparison
