Extraction - Spectrophotometric Determination of Palladium with Tetrabutyl Ammonium Iodide

Abstract

<em>A sensitive and selective extraction - spectrophotometric method for the determination of trace amounts of palladium is reported. The method is based on quantitative extraction of brownish tetrabutylammoium tetraiodopalladium (II) ion pair into a small valume of chloroform at pH 1.3-12.0, followed by spectrophotometric measurements. The Beer's law is obeyed over the range 0.02-1.09 </em><em>m</em><em>gml^-1 at 445 nm with the molar absorptivity of 5.3</em><em>´</em><em>10³ lmol^-1cm^-1. The Sandell's sensitivity is 0.80 mg cm^-2 for 0.001 absorbance unit. The method has a wide range and is simple, rapid and free from interferences from many cations and anions. The procedure was applied to the determination of palladium in the activated carbon.</em>