Abstract
A simple and convenient method for the determination of copper (II) has been developed, based on the extraction of the 8-quinolinol complex into propylene carbonate followed by differential-pulse polarography. A polarographic cell has been designed, in which the solvent extraction and deoxygenation can be done simultaneously by passing nitrogen through the aqueous and organic phases. An aqueous sample solution is placed with 2.0cm3 of 0.1mol dm-3 sodium acetate solution (pH 8.0), 1.0cm3 of 0.1 mol dm-3 sodium EDTA solution and then water to make up the total volume of 5.0cm3. To this solution is added 5.0cm3 of propylene carbonate solution containing 0.1 mol dm-3 tetrabutylammonium perchlorate and 0.1 mol dm-3 8-quinolinol. Emulsion is formed by stirring with a stream of nitrogen for 3 min. After the extraction, the three electrodes are inserted into the organic phase. The differential-pulse polarogram is recorded under the following conditions: scan rate 5 mV/s; modulation amplitude : 25 mV; drop-time; 2s. The peakcurrent at-0.45 V vs. Ag/AgCl is directly proportional to the Cu (II) concentration up to 3.0 μg/cm3. The lower limit of determination has been found to be 0.1 μg/cm3 Cu(II) in the aqueous phase. The method can be applied to the determination of copper in Bovine Liver and River Sediment of NBS standard sample.
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