Extraction-Spectrophotometric Determination of Traces of Copper with 2-Hydroxy-1-naphtaldehyde 2-Benzothiazolylhydrazone

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Abstract
A method has been proposed for the spectrophotometric determination of microgram amounts of copper, after extraction of copper(II) from an aqueous solution into chloroform with 2-hydro xy-1-haphtaldehyde 2-benbthiazolylhydrazone(NBH) Various factors such as pH concentration of HNBH vo1ume ratio of two phases, shaking time, diverse ions, etc have been studied, and the optimum conditions for the determination of copper(II) have been established. The ratio of copper to HNBH has er of sample selution S n a 50 ml separatory funnel, and make the volume up to 20 ml with water. djusted to 5.3.v9.5 with acetate buffer solution, and then make the Extract the complex with 10.O m of chloroforme two phases for 5 minutes.After the phases have been sepa- bottle containing sodium sulfate, and the absorbance at 426 nm against the complexwhlch co1d be extracted The extracted coex had an ab- beenE, 60nfirmed to be o ntalnlng up to A linear relationship was found between the concentration of copper and the absorbance. The molar extinction coe cient and the se nstivity for 1o9(Icll)=O OOI were 2 2104 and 2 9 103pg Cu/ma, respectively. Several ions such as silver(1), cobalt(III), mercury(11), titanium('V), thiocyanate, tartrate and citrate interfered with the determination.

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