Determination of Diethyldithiocarbamate in the Solid Phase of a Fibrous Cation Exchanger in the Cu-Form Using Diffuse Reflectance Spectroscopy

Abstract

Diffuse reflectance spectroscopy was used to study the interaction of sodium diethyldithiocarbamate (DEDTC) with copper ions adsorbed on the disks of a PANF–KU-2 fibrous cation exchanger. The conditions for obtaining the substrate in the Cu-form are determined. The dependence of the analytical signal on the adsorption conditions of DEDTC was studied: the pH of the solution, the contact time of the solution with the substrate, the volume of the solution, and the concentration of DEDTC in the solution. Diffuse reflectance spectra of the PANF–KU-2–Cu substrate and the complex of DEDTC with Cu in the PANF–KU-2 phase were recorded. The best analytical signal was observed at 450 nm. A probability of the formation of Cu(DEDTC) and Cu(DEDTC)₂ complexes on the adsorbent surface depending on the concentration of DEDTC in the solution was noted. The PANF–KU-2–Cu substrate can be used for the adsorption and determination of 0.1–0.6 µg/mL of DEDTC in alkaline solutions (pH 7–10) by measuring the diffuse reflectance coefficient of disks at 450 nm. The procedure was tested on model solutions of tap water.