A bulk liquid membrane–flow injection (BLM–FI) coupled system for the preconcentration and determination of vanadium in saline waters

A bulk liquid membrane–flow injection (BLM–FI) system has been developed for the preconcentration and spectrophotometric determination of vanadium in saline waters. The preconcentration step was based on a bulk liquid membrane containing Aliquat 336 (acting as a carrier) dissolved in dodecane/dodeca...

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Bibliographic Details
Published in:Talanta (Oxford) 2013-01, Vol.103, p.161-165
Main Authors: Pinto, Juan J., García-Vargas, Manuel, Moreno, Carlos
Format: Article
Language:English
Subjects:
Bulk liquid membrane
Coloring Agents - chemistry
Di-2-pyridyl ketone benzoylhydrazone
Flow Injection Analysis
Hydrazones - chemistry
Limit of Detection
Liquids
Membranes
Membranes, Artificial
Pyridines - chemistry
Quaternary Ammonium Compounds - chemistry
Saline water
Salt water
Seawater
Seawater - analysis
Spectrophotometry
Transport
Vanadium
Vanadium - analysis
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Summary:A bulk liquid membrane–flow injection (BLM–FI) system has been developed for the preconcentration and spectrophotometric determination of vanadium in saline waters. The preconcentration step was based on a bulk liquid membrane containing Aliquat 336 (acting as a carrier) dissolved in dodecane/dodecanol. Vanadium species were chemically pumped due to the pH gradient between the sample (pH 3.2) and the receiving solution (pH 9.8). Vanadium transport through the membrane was monitored by a new and sensitive spectrophotometric method based on its reaction with di-2-pyridyl ketone benzoylhydrazone (dPKBH) in an acidic medium. As a consequence of membrane transport, vanadium was recovered in an ammonium solution, where total vanadium concentration was spectrophotometrically determined at 375nm, as the pentavalent species, by using a flow injection analysis (FIA) system. Under optimal conditions, this FIA system provided a detection limit of 4.7μgL−1 (3sblank/m) and RSD 2.72%, for vanadium determination in saline samples. Both preconcentration and determination steps were previously optimized by modified simplex methodologies. The proposed coupled method was successfully applied to the determination of vanadium in a certified reference material (TMDA-62) and in two seawater samples. ► Preconcentration and determination of vanadium in seawater samples is achieved. ► Aliquat 336 is used as the carrier in the bulk liquid membrane. ► Di-2-pyridyl ketone benzoylhydrazone is employed as the colorimetric reagent. ► Limit of detection of 4.7μgL−1 is obtained. ► Sample and reagents consumption is reduced and wastes minimized.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2012.10.026