Simultaneous Separation and Preconcentration Trace Amounts of Cd2+, Mn2+, Ni2+, Zn2+ and Fe2+ onto Modified Amberlite XAD-4 Resin that Loaded with Pyrocatechol Violet

Abstract

In this work, a procedure for simultaneous separation and preconcentration of trace amounts of Cd²⁺, Mn²⁺, Ni²⁺, Cu²⁺, Zn²⁺ and Fe²⁺ has been proposed. It is based on the adsorption of these ion solutions on to a column of amberlite XAD-4 resin that modified with benzyldimetyltetradecylammonium chloride and loaded with pyrocatechol violet reagent. These ions are quantitatively retained on the column in the pH range of 7.4-8.2 at a flow rate of 3 mL min^-1. The retained anaiyte on the resin recovered with 10.0 mL of 4 mol L^-1 nitric acid with a flow rate of 1 mL min^-1 and then the ions were determined by flame atomic absorption spectrometry. In this case, 0.50 μg of cadmium, 0.60 μg of manganese, 3.0 μg of nickel, 0.40 μg of zinc and 2.0 μg of iron can be concentrated in the column from 850 mL of aqueous sample whose preconcentration factor is 85. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the trace determination of these ions in various standard samples. Determination of the ions in standard samples indicated that the method has good accuracy.