Speciation of vanadium (IV) and vanadium (V) with Eriochrome Cyanine R in natural waters by solid phase spectrophotometry |
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Authors: | J M Bosque-Sendra Ma_ Carmen Valencia and Said Boudra |
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Institution: | (1) Department of Analytical Chemistry, University of Granada, E-18071 Granada, Spain, ES |
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Abstract: | The separation and preconcentration of vanadium (IV) and vanadium (V) using Sephadex DEAE A-25 with Eriochrome Cyanine R
has been studied, based on the preconcentration of vanadium (IV) in the first step and V(V) after reduction with ascorbic
acid in the second step. Factors affecting the optimum fixation of the complex were investigated. The absorbance of the solid
phase is measured directly at 563 nm for V(IV), at 585 nm for V(V) and at 750 nm for both. The proposed method provides a
simple and specific procedure for the separation of vanadium in natural waters. The calibration graph is linear up to 150
ng/mL, with RSD of 4.7% for V(IV) and 4.0% for V(V). The detection limits are 1.6 and 1.4 ng/mL for V(IV) and V(V), respectively.
Received: 21 November 1996 / Revised: 15 April 1997 / Accepted: 18 April 1997 |
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