โ Scribed by Shirley B. Radding; Russell C. Phillips; Nevin K. Hiester
No coin nor oath required. For personal study only.
, it bccamc apparent that evaluation of the experimental results in terms of ion concentrations in the solution and on the resin, would bc considerably enhanced by ;L careful study of the analytical procedures involved. The present paper describes the analytical methods used, the problems which were encountered, uncl how they were solved.
In order to simplify theoretical problems as much as possible, lithium ion (Li+) and potassium ion (K+) were chosen as the ions to bc separated, and hyclrogcn ion (Hmk) as the carrier and elutant. This particular system was selected bccausc : (I) the three ions are of equal valcncc, thus simplifying the exchange mechanism ; (2) Li+ and K' are both available in pure form, as the chlorides, at rcnsonable costs: (3) as the second and fourth elements in the alkali metal series, Lie'-and Kf differ sufficiently to make separation feasible; and (4) H+ may be analyscd easily. A nuclear-sulfonic polystyrcnc-base type resin, Chempro C-zo cation cxchangcr, was used because of its homogeneity of structure and uniform exchange strength.
The objectives of the analytical program, then, were (I) the accurate determination of the concentrations of the alkali metal ions in solution in the presence of I-Ij-and each other, and (z) the quantitative removal of the alkali metal ions from the resin in a form suitable for solution analysis. ANALYSIS 01: SOLUTIONS The flame photometer was chosen for the analysis of the Li+ and K+ because it offered the highest potential (and speed) available for analysis of the alkali metal ions in the concentration range of interest1J29s. A Beckman DU spectrophotometer with an acctylcnc-oxygen flame attachment was used throughout the program. Rcfcvc?lces p.
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