SYNTHESIS OF A MORIN CHELATING RESIN AND ENRICHMENT OF TRACE AMOUNTS OF MOLYBDENUM AND TUNGSTEN PRIOR TO THEIR DETERMINATION BY INDUCTIVELY COUPLED PLASMA OPTICAL-EMISSION SPECTROMETRY

A morin chelating resin was synthesized using aminated poly(vinyl chloride) as the starting material, and the optimum conditions for the synthesis were established. The parameters governing the characteristics of the resin for the adsorption of Mo(VI) and W(IV) including acidity, flow rate, rate constant, saturated capacity of adsorption, effect of re-use, interfering ions and desorption were investigated. The Mo(VI) and W(VI) concentrations in standard samples were determined by using inductively coupled plasma optical emission spectrometry, with satisfactory results. For concentrations of Mo(VI) and W(VI) of 0.4 mg l-1, the relative standard deviation was 2.8% for Mo(VI) and 2.6% for W(VI). The structure of the chelating resin was deduced by infrared spectrometry, and the mechanism of the enrichment of Mo(VI) and W(VI) is discussed.