Use of Hydrazine Carboxamide-2-[(2-Hydroxy-1-Naphthalenyl) Methylene] as an Analytical Reagent for the Extractive Spectrophotometric Determination of U(Vi)

Abstract

Extraction and spectrophotometric determination of Uranium (VI) was carried out using Hydrazine Carboxamide-2-[(2-Hydroxy-1-Naphthalenyl) Methylene] as an analytical reagent. A reddish brown coloured complex is formed at pH 9.2 between U(VI):HCHNM which is extracted in n-butanol. An intense peak for the complex was observed at 385nm, well separated from that of ligand. Beer’s law is obeyed over the range of 2 to20 ppm. Composition of M:L in the complex was ascertained by Job’s method, mole ratio method and slope ratio method and found to be 1:2. Extraction and spectrophotometric determination of U(VI) was carried out using Hydrazine Carboxamide-2-[(2-Hydroxy-1-Naphthalenyl) Methylene] as an analytical reagent. A reddish brown coloured complex is formed at pH 9.2 between U(VI):HCHNM which is extracted in n-butanol. An intence peak for the complex was observed at 385nm, well separated from that of ligand. Beer’s law is obeyed over the range of 2 to 20 ppm. Composition of M:L in the complex was ascertained by Job’s method, mole ratio method and slope ratio method and found to be 1:2. Diverse ion effect was studied for various ions and the proposed method was found to be highly selective for the trace concentration of U(VI). Molar absorptivity and Sandell sensitivity values calculated are 0.1566 x104L mol-1cm-1 and 0.0585μg/cm2 respectively. Proposed method has been successfully applied to analyse synthetic samples and the results were found to be in good agreement with standard gravimetric methods.