Method for Analytical Determination of Extracting Agents

摘要

A spectrophotometric method is proposed for determining tributyl phosphate and diisoamyl ester of methylphosphonic acid in solvents such as saturated hydrocarbons and kerosene within concentration limits of 0.1 to 0.6% (by volume) and higher for the given compounds. The method consists of measuring the optical density in the solutions being analyzed at preselected wavelengths in the infrared region of the spectrum and determining the concentration using calibration diagrams. The accuracy of the analysis is considerably greater than that of the chemical method. The error of determination ranges from 4 rel. % at concentrations on the order of 10% to 8 rel. % at concentrations on the order of 0.01%. Sensitivity of determination is two orders of magnitude greater than for the known method and corresponds to the absolute sensitivity of 8 mg tributyl phosphate. The proposed method is simple. The procedure can be carried out on any infrared spectrometer. (ERA citation 07:059833)