Determination of Pd(II) with flame atomic absorption spectrometry after flow injection on-line microcolumn preconcentration and separation with thiourea-formaldehyde resin immobilized silica gel as packing

Abstract

A flow injection on-line preconcentration and separation-flame atomic absorption spectrometric method is developed and applied to analysis of trace Pd (II) with thiourea-formaldehyde resin immobilized silica gel as packing. With a sample acidity of 0.2 mol/l HCl, Pd(II ) is effectively preconcentrated on the microcolumn packing and then eluted with thiourea solution. When 0.1 μg/ml of Pd(II) is preconcentrated for 60 s with a sample flow rate of 4.8 ml/min, the system can tolerate 20.0 mg/ml of anion and 5.0 mg/ml of common metal ions. The limit of detection is 1.5 ng/ml with the relative standard deviation being not more than 2.0% . The proposed method has been applied for

analysis of metallurgical samples and results are in good agreement with the certified values.