Solid-Phase Extraction of Copper with Lead 4-benzylpiperidinedithiocarbamate on Microcrystalline Naphthalene and its Spectrophotometric Determination


Abstract: Using lead 4-benzylpiperidinedithiocarbamate complex (Pb(4-BPDC)_{2}), a solid-phase extraction method was developed for pre-concentration and spectrophotometric determination of copper in water samples. In this method, copper in large volume liquid phase quantitatively replaces lead on colorless Pb(4-BPDC)_{2} complex and naphthalene solid phase mixture forming Cu-4-benzylpiperidinedithiocarbamate complex (Cu(4-BPDC)_{2}). The solid phase containing colored Cu(4-BPDC)_{2} is dissolved in chloroform and its absorbance is measured at 437 nm against the reagent blank. The range of linearity is 0.4 -10 \mu gml^{-1} of copper in chloroform, the molar absorptivity of the complex determined from the linear portion of Beer's law plot is 8.197x10^{3} lmol^{-1}cm^{-1} and the sensitivity is 0.0013 \mu gcm^{-2} for an absorbance of 0.001.

Keywords: Solid-phase extraction, copper, 4-benzylpiperidinedithiocarbamate, UV-VIS spectrophotometry, microcrystalline naphthalene.

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