Reagents
Double-distilled water and analytical grade reagents were used to prepare all solutions. Cadmium nitrate, cobalt sulphate, manganese chloride, zinc acetate, ammonium reineckate and sodium cobaltinitrite (Aldrich products) were used.
The aminoquinoline antimalarials studied are AQCl, CQP and PQP, all of pharmaceutical grade. Representative dosage forms are obtained from commercial sources. The purity of these drugs was checked by their official methods of analysis [4] and [23].