Three kinds of new chelating resin containing /?-hydroxydithiocinnamic acid, ethyl /~-hydroxydithiocinnamate and N-(hydroxymethyl)-thioamide functional groups were synthesized. Cu(II), Cd(II) and Hg(II) were used as complex forming metal ions. By varying the combination of metal ion and chelating resin, a great variety of separation systems could be realized. For the on-line trace enrichment of 2-mercaptobenzimidazole, the copper-loaded N-(hydroxymethyl)-thioamide concentration column was found most suitable. UV detection at 300 nm was used. The detection limit was 0.2 ng/g. A 10 ml sample was found to be sufficient to attain the described sensitivity, and linear relationship was obtained-in the range of 0.75 ng/g to 12 ng/g. The best separation of the thiol compound mixture thioglycolic acid, methionine, cysteine and 2mercaptoethanol was obtained with coppeMoaded ethyl/~hydroxydithiocinnamate resin; UV absorbance detection was at 215 nm.

A novel chelating resin was obtained by incorporating 2-mercaptoethylamine into polystyrene divinylbenzene copolymer. Conversion of functional groups of the resin was confirmed by IR spectra, elemental analysis, hydrogen capacity, and protonation constants. The functionality of the resin is 0.45 mmol g". The water regain as a function of pH was determined. The coordination behavior of the resin was investigated by JR, EPR and potentiometry, Effects of pH on adsorption of metal ions to the resin, both at large excess and limited amount of metal ions were examined. The resin exhibits exceptionally high affinity for soft metal ions, even in highly acidic aqueous media. EPR measurements at different copper loading were made. The results showed that the copper(II)-resin complex might be distorted tetragonal. Protonation constants and stability constants of the resin were determined at 25 ·C and ionic strength of 0.5 M KCI solution. The selectivity of the resin toward metal ions decreased in the order: Au(lII) > Pt(IV) > Ag(I) > Pd(I1) > Hg(II) > Fe(III) > Cu(II) > Zn(II) > Cd(II) > Ni(Il) == Co(II). Metal ion coordination occurs primarily at the nitro-

A chelating resin with acetohydroxamate functional groups was synthesized and used as the stationary phase in ion chromatography for the determination of copper. As the reaction mechanism was mainly complexation, the coordination behavior of the synthesized resin toward Cu(II) was studied by means of EPR, IR and electronic spectrometry and potentiometry. The kinetic study shows that the resin is suitable for use in ion chromatography. We employed a resin column 250 mm long by 3 mm I.D. in conjunction with a mixture of hydrochloric acid and acetone as mobile phase for the determination of Cu(II). Detection of the chromatography system was carried out via post‐column derivatisation of the column effluent with PAR at 520nm. The detection limit is 0.22ppm, and the relationship was linear in the range 0.25‐1.20ppm. We investigated the effect of other metal ions, As(V), Cd(II), Cr(III), Hg(II), Ni(II), Pb(II) and Zn(II), or foreign ligands, EDTA, ascorbic acid, humic acid or sodium chloride on the determination of Cu(II) ion. A concentration column packed with acetohydroxamate resin combined with the above separation system was also used to determine of copper ion; the dynamic range is 2‐15 ppb and the detection limit is 0.70ppb. The proposed system was applied to the analysis of Cu(II) in sea water.