Abstract
A chelating resin with dithiocarbamate functional groups to which silica gel was used as a matrix and silanes were used with diamino functional groups as a spacer was synthesized. The structure and the conversion of functional groups of the resin were confirmed by IR spectra and elemental analysis. The influence of pH on the adsorption of the resin for metal ions was also examined. The resin under optimum pH conditions formed a 1:1 metal complex with copper ion. The affinity of metal ions toward the synthesized resin decreased in the order Hg(II) >; Cu(ll) >; Cd(II) >; Zn(II). The resin exhibited efficient complexation of transition metal cations. The cadmium, copper and zinc complexes were investigated for application as stationary phase for the gas chromatographic analysis of dialkyl sulphides. The material was packed in a 2.1 m × 3.2 mm I.D. spiral glass column. Factors affecting the retention and sample selectivity were also studied. A shorter retention time and sharp peaks were obtained when ammonia was introduced into the mobile phase. At an oven temperature of 100°C, a flow-rate of 60 ml min −1 and use of a flame ionization detector, the analysis of dialkyl sulphides showed that the copper resin complex as the stationary phase gave the best results. The stationary phase was also used for the separation of dialkyl sulphide from a hydrocarbon mixture.
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