Spectrophotometric Determination of Microgram Amounts of Aliphatic Amines with Quinalizarin

Abstract

ABSTRACT A simple, rapid and sensitive spectrophotometric method for the determination of aliphatic amines was developed. The method is based on the proton transfer reaction with quinalizarin reagent in aqueous neutral solution to form violet product which shows maximum absorbance at 560 nm with molar absorptivity ranged between 3600 l.mol-1.cm-1 for ter-butyl amine to 6720 l.mol-1.cm-1 for sec-butyl amine. The accuracy (average recovery) of the method was 100.15% and the precision (RSD) was less than 3.1%. The effect of various compounds on the determination of aliphatic amines has been studied. The nature and stability constant of the products have been estimated.

Keywords

• spectrophotometric determination
• aliphatic amines
• quinalizarin