Abstract
There has a wide interest in stability of different types of ion exchange resins against ionizing radiations. The irradiation damage and stability of polystyrendigni benzene and phenolformaldehide sulphonic acid ion exchange resins was investigated by determination of the radiolytic gases. The gas analysis showed a very good linear dose dependence of the evolved hydrogen and carbon monoxide. The linearity of carbon dioxide was good for Dowex 50 WX 10 but less pronounce for zeo-carb 215. Sulphur dioxide was at least partially produced by direct action and was consumed by secondary reaction during irradiation. Kuzin et al [1] analysed radiolytic gases evolved from a carboxylic acid exchange resin. Wiely et al [2] investigated gamma radiation induce degradation of sulphonetic styrle resin cross link with 4 and 8 % m / p dinyl benzene isomer or mixtures thereof including commercial divenyle benzene have been shown loss in capacity 5-12. 8% at the radiation intensities of 290 R/hr and total dose 0.91 – 1.0 x 10-8 rad in presence of water.
Highlights
From the investigations of ion exchange in mixed solvents, it is apparent that the adsorption equilibrium depends markedly on the properties of the organic solvent and reactions with the resin and electrolytes which determine the equilibrium
Cation exchangers permit the phenomenon of combined ion exchanger-solvent extraction (CIESE) to be exhibited 8, 9, 10 complex formation of the metal ions with organic compounds has been advantageously used to achieve difficult separations
Material and Methods The distribution coefficient, KD was determined by batch equilibrium method. 1 g of air dried Dowex 50 W X8 (NH4 + form) resin was taken in 250 ml glass stoppered Erlynmeyer flask. 4 ml of 0.05M metal ion solution and 50 ml of the appropriate aqueous acetone-ammonium propionate mixtures was taken
Summary
Tthe presence of water miscible polar solvents proved to be advantageous in the metal ion exchange in complexing media. Firtz et al [3] separated many metal ions using 0.1 or 1 M hydrofluoric acid as the eluting agent, the method of separation of Al3+, Ti4+ , V4+ and Nb5+ ions was studied by Dowex 50 WX8 resin in H + and ethylene di -ammonium forms. Cation exchangers permit the phenomenon of combined ion exchanger-solvent extraction (CIESE) to be exhibited 8, 9, 10 complex formation of the metal ions with organic compounds has been advantageously used to achieve difficult separations. Attempts were made to separate the metal ions in aqueous acetone propionic acid media by using Dowex 50 WX8 in H+ form. The distribution coefficients of various metal ions were found to be very high and the separations
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