Date of Award
Doctor of Philosophy
Strong-base anion exchangers with capacities ranging from 0.04 to 1.46 mequiv./g and from 0.0016 to 0.024 mequiv./g are prepared from Amberlite XAD resins. Distribution ratios of common inorganic and organic anions decrease with decreasing resin capacity, but selectivity coefficients are essentially constant for most of the anions studied;The effect of resin capacity on the distribution ratios for some of the metals that form anionic chloro complexes is also studied. The low-capacity resins are shown to be useful for practical chromatographic separations of mixtures containing palladium(II), platinum(IV), gold(III), bismuth(III) and mercury(II);A new and simple system of anion chromatography is described for the separation and determination of inorganic and organic anions. The anions are separated on a column containing a macroporous anion-exchange resin of a low capacity (0.007-0.07 mequiv./g). Only a dilute solution of an aromatic organic acid salt is needed as the eluent. The eluent conductance is sufficiently low so that a suppressor column is not needed and the separated anions can be detected with a simple conductance detector. Numerous examples of actual separations are shown. In some cases, concentrations of anions below 1 ppm could be detected. Equations are developed to help separate difficult mixtures of anions;A system of cation chromatography is described in which metal and ammonium ions are separated on a cation-exchange column of low capacity and are detected with a conductivity detector. No suppressor column is needed. A nitric acid eluent is used to separate mixtures of alkali metal and ammonium ions, and an eluent containing an ethylenediammonium salt is used for the separation of alkaline earth metal ions. The new method is used to determine sodium, potassium, ammonium, magnesium and calcium in drinking water;('1)DOE Reports IS-T-916. This work was performed under contract W-7405-Eng-82 with the U.S. Department of Energy.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Douglas Thomas Gjerde
Gjerde, Douglas Thomas, "Ion chromatography with low-capacity resins and low-conductivity eluents " (1980). Retrospective Theses and Dissertations. 6786.