Determination of iron at ng/ml level by solid phase spectrophotometry after preconcentration on cation exchange filters.
A cationic exchanger paper is used to retain analytes in solution and, after drying, to analyze directly by measuring the UV-Vis absorbance of the paper. The method was applied to determination of iron using its known 1,10-phenanthroline complex. Using 100 ml of sample the applicable concentration range was between 1.0 and 10.0 ng/ml with a detection limit of 0.2 ng/ml and a RSD around 2%. The method was applied to determination of iron total in snow, human serum and wine.
García
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FC
Department of Analytical Chemistry, University of Granada, Granada, Spain.
Checa
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Avidad
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Capitán-Vallvey
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LF