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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 58, Number 3
JKCSEZ 58(3)
June 20, 2014 

Application of Polyurethane Foam Loaded with a Schiff Base Ligand for Determination of Trace Amounts of Copper in Water Samples by Flame Atomic Absorption Spectroscopy
Mahdieh Koorehpazan Moftakhar, Mohammad Reza Yaftian*, Samaneh Nahaei, Abbas Ali Zamani
Polyurethane foam, Schiff base, Solid phase extraction, Cu(II), Determination
A column solid phase extraction procedure based on modified polyurethane foam (PUF) by a newly synthesized Schiff base ionophore, named 2,2'-{iminobis[propane-3,1-diylnitrilo(1E)prop-1-yl-1-ylidene]}diphenol, was developed for preconcentration step of trace amounts determination of copper ions in water samples by atomic absorption flame spectroscopy. The influence of parameters on the adsorption process such as sample pH, amount of modified PUF packed in the column, type and volume of stripping reagent and its flow rate were investigated and optimized. Under optimum experimental conditions, the calibration graph was linear in a relatively wide range (0.005-210 μg/ml) with a limit of detection 0.002 μg/ml of copper. The proposed method allows achieving to a concentration factor of >133. The capacity of a column (1.6 cm i.d.) packed by 6 g of PUF modified by 12 mg of the Schiff base was found to be 247.7 (± 2.1) μg of copper. It was found that the adsorption process was highly selective towards copper ions with respect to some associated metal ions. The presented procedure was successfully applied for determination of copper in some water samples.
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