Extraction-spectrophotometric determination of traces of copper with salicylidene-ο-aminophenol

Abstract

A study was carried out on the spectrophotometric determination of 0∼40 μg of copper by extracting its salicylidene-ο-aminophenol(SAP)complex in to methyliso-butylketone (MIBK). Copper (II) was extracted as its SAP complex from weakly acidic to alkaline aqueous media into MIBK phase and a constant absorbance was obtained in the pH range between 4.3 and 8.3. The complex extracted was very stable and had an absorption maximum at 423 mμ. Its composition was confirmed to be 1 to 1. A linear relationship was maintained between the concentration of copper and the absorbance. The molar extinction coefficient and the sensitivity for log(I0/I)=0.001 at 423 mμ were 16200 and 3.9×10-3μg Cu/cm2, respectively. Several ions including iron-(III), vanadium (IV and V), molybdenum (VI), perchlorate and citrate interfered with the determination. Interference due to iron (III) could be removed by reducing it to ferrous state with ascorbic acid. © 1969, The Japan Society for Analytical Chemistry. All rights reserved.