Spectrophotometric Determination of Copper in Alloys Using Acetoacetanilide

From 150 to 900 \(\mu\)g of copper (II) have been extracted aqueous solutions maintained at \(p\)H 7.1 to 8.0 into 10 ml of chloroform in one step using acetoacetanilide as complexing agent and have been deter­mined spectrophotometrically in these extracts at 340 \(m\mu\), using reagent blank or pure chloroform as re­ference. In addition to the advantage of one step extraction, the possibility of the estimation of the metal ion in the presence of appreciable amounts of Ni²⁺, Co²⁺, Mn²⁺, Zn²⁺,Hg²⁺,Mg²+, Pb²+, Ca²+, Ba²⁺, Bi³⁺, Al³⁺ and F^1- has been found to be very convenient. Thus copper has been determined in alloys like brass, white metal etc., without the separation of the former ions with high degree of accuracy.