DETERMINATION OF IRON AT NG ML LEVEL BY SOLID-PHASE SPECTROPHOTOMETRYAFTER 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 it s known 1,10-phenanthroline complex. Using 100 ml of sample the applic able concentration range was between 1.0 and 10.0 ng/ml with a detecti on limit of 0.2 ng/ml and a RSD around 2%. The method was applied to d etermination of iron total in snow, human serum and wine.