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This article compares the solid phase extraction (SPE) and coprecipitative preconcentration of cadmium and lead from dilute aqueous solutions as a function of pH and weight of chelating agent. SPE enriches cadmium and lead over a wider pH range (6.0–8.0) and requires lower weight of DBQ chelate embedded benzophenone. Among the quinoline-8-ol and its dihaloderivatives, DBQ embedded benzophenone allows...
The preparation of solid reagent 5,7-dichloroquinoline-8-ol modified benzophenone for preconcentration of thorium is described. The thorium-5,7-dichloroquinoline-8-ol complex is quantitatively retained on benzophenone in the pH range 6.0-6.5. The solid mixture consisting of the metal complex together with benzophenone is dissolved in 5 ml of acetone and thorium content was established spectrophotometrically...
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