DIFFERENTIAL-PULSE POLAROGRAPHIC-DETERMINATION OF COPPER AND BISMUTH IN VARIOUS REAL SAMPLES AFTER ADSORPTION OF THEIR MORPHOLINE-4-CARBODITHIOATES ON TO A MICROCRYSTALLINE NAPHTHALENE OR A RPHOLINE-4-DITHIOCARBAMATECETYLTRI-METHYL-AMMONIUM BROMIDE-NAPHTHALENE ADSORBENT

The morphsline-4-carbodithioates of copper and bismuth are quantitativ ely adsorbed on microcrystalline naphthalene in the pH range of 3.2-5. 7 and 6.5-11.2 respectively. These metals are desorbed with 10 mt of 1 M HCl and subsequently determined with a differential pulse polarogra ph. These metals can alternatively be quantita-tively adsorbed on morp holine-4- dithiocarbmate cetyltri-methylammonium bromide-naphthalene [ MCDT-CTMAB-Naphthalene] adsorbent packed in a column and determined si milarly. The detection limits are 0.1 ppm for copper and 0.05 ppm for bismuth at minimum instrumental settings (signal-to-noise ratio=2). Th e linearity is maintained in the concentration ranges of copper, 0.5-1 2.0/0.5-7.0 and of bismuth 0.50-10.0/0.05- 5.5 ppm with a correlation factor of 0.9996 and relative standard deviations of 0.80 and 0.89% fo r microcrystalline naphthalene and column method respectively. Various parameters have been optimized for trace estimation of these metals i n various real samples.