Preparation of some thiol amine surfactants for sensors fabrication to determine the metal ions in polluted water

Abstract

In this thesis, some amino thiol surfactants were prepared by addition polymerization of some thiols to acrylic acid followed by amidation reactions. The characterization of the prepared products was carried out using FTIR spectrometer and GPC analysis. The data of surface active parameters and thermodynamic parameters of the prepared surfctants were determined. Two of the prepared surfactants were utilized for the fabrication of iphI-modified carbon paste (iphI-MCPE; electrode IV) and iphII-modified carbon paste (iphII-CPE; electrode X) sensors. Fast, highly sensitive and wide dynamic range potentiometric sensors were constructed using the prepared compounds to quantitatively determine Cr(III) in different water samples. The electrodes exhibited an excellent Nernstian response to Cr(III) ion ranging from 4.8 × 10-7 to 1.0 × 10-2 and 6.0 × 10-5 to 1.0 × 10-2 mol L-1 with a detection limit of 4.8 × 10-7 and 6.0 × 10-5 mol L-1 and a slope of 19.59±0.45 and 13.83±1.54 mV decade-1 for electrode (IV) and electrode (X), respectively. The results obtained compared well with those obtained using atomic absorption spectrometry. Keywords: Aminothiol surfactants, surface active and thermodynamic parameters, potentiometric sensors, chromic ions in water samples.