Chromatographic separation of metal ions on low capacity, macroreticular resins

Ion-exchangers for gas-solid chromatography

“…By selecting a porous polymer which gave efficient separations in gas chromatography and modifying it only on the surface of the large pores, it was expected that the efficiency would be retained and tailing prevented, since no small pores would be produced. This has proved to be the case in liquid chromatography on similar materials; such ion exchangers allowed more rapid chromatographic separations than conventional, fully-sulfonated resins (6)(7)(8).…”

“…The resins were converted into the silver form by washing with 1 M AgN03, to the sodium form by washing with 1 M NaOH, to the nickel form by washing with 0.2 M Ni(N0J2, and to the cadmium form by washing with 0.5 M CdC12, followed in all cases by washes with water, and drying at 110 "C for at least 4 h. Porapak Q (80-100 mesh) was sulfonated by suspending a 10-g portion of the porous polymer in about 50 mL of concentrated sulfuric acid (6,9). The mixture was swirled vigorously for the prescribed time, and then about 50 mL of 50% aqueous sulfuric acid was added to quench the reaction.…”

“…These materials, which have previously found application in liquid chromatography (6)(7)(8), allow efficient separations a t 'On sabbatical leave at the Inorganic Chemistry Laboratory, Oxford, 1975-76. moderate temperatures. They are easy to prepare and require no special treatment prior to use.…”

Resins and Columns

“…Fritz and Story [25,26] prepared several low-capacity sulfonated resins for the chromatographic separation of various metal cations. Macroporous resins were used and their selectivity was somewhat different from that of conventional gel resins.…”

Recent developments in the high‐performance chelation ion chromatography of trace metals

“…The colorimetric reagent also needed to react with a wide range of metals and produce complexes with very high molar absorptivities, with a wavelength of maximum absorptivity well removed from that of the free reagent. 4-(2-Pyridyl)azoresorcinol (PAR) fulfilled all these criteria and after pioneering work by Fritz and Story [56] in the 1970s soon became established as the one of the best and most commonly used PCR reagents. PAR is particularly suited to the detection of most of the first row transition elements and Cd and Pb.…”