Ethylene diamine tetra acetic acid (EDT A) is a versatile complexing agent and is being employed in decontamination formulations. The dilute chemical decontamination (DCD) process employs ion exchange resins for regeneration of complexants, collection of metal ions/active isotopes and for removal of the decontaminating chemicals. In this work the interactions of EDT A on cation and anion exchange resins have been studied. The pickup of EDT A on cation exchange resin is by ion exchange mechanism and not possibly by precipitation at the low pH existing in ion exchange resin matrix. A mathematical relationship has been worked out to calculate the amount of EDT A adsorbed per unit volume of the cation exchange resin at a given pH. In addition, the behaviour of DTPA, HEEDTA and NTA on cation exchange resin has been evaluated. The chromatographic behaviour of oH-form of strong base anion exchange resin for a formulation containing EDT A, oxalic acid and citric acid has been reported and its relevance to the decontamination process has been discussed.Even though the corrosion rate of DCD is very low on most of the materials of construction, influence of time, temperature and the composition of the formulation on carbon steel is studied. Different classes of inhibitors were evaluated for reducing carbon steel corrosion.

Ethylene diamine tetra acetic acid (EDT A) is a versatile complexing agent and is being employed in decontamination formulations. The dilute chemical decontamination (DCD) process employs ion exchange resins for regeneration of complexants, collection of metal ions/active isotopes and for removal of the decontaminating chemicals. In this work the interactions of EDT A on cation and anion exchange resins have been studied. The pickup of EDT A on cation exchange resin is by ion exchange mechanism and not possibly by precipitation at the low pH existing in ion exchange resin matrix. A mathematical relationship has been worked out to calculate the amount of EDT A adsorbed per unit volume of the cation exchange resin at a given pH. In addition, the behaviour of DTPA, HEEDTA and NTA on cation exchange resin has been evaluated. The chromatographic behaviour of oH-form of strong base anion exchange resin for a formulation containing EDT A, oxalic acid and citric acid has been reported and its relevance to the decontamination process has been discussed. Even though the corrosion rate of DCD is very low on most of the materials of construction, influence of time, temperature and the composition of the formulation on carbon steel is studied. Different classes of inhibitors were evaluated for reducing carbon steel corrosion.

Oxidizing environment prevailing in water coolant systems aggravates the corrosion of structural materials. Reducing agents are added to the reactor coolant systems to control the oxidants and mitigate material corrosion. Maintenance of required concentration of the reducing agents in the system and their removal after completing the processes can be done using ion exchange resins as well as ion exchange membranes. In this article, a comparative study on the efficacy in removing the reducing agents from aqueous solutions by the cation exchange resin and membranes such as sulfonated polysulfone and nafion is evaluated. Some of the membranes were synthesized in the laboratory and characterized by SEM, FTIR and pure water flux studies. Nitrogen containing reducing agents such as hydrazine, hydroxylamine, and ammonium hydroxide have been chosen for the study. Results indicate that strong acid cation exchange (SAC) resin taken in a column and sulfonated polysulfone (SPSf) membrane as a stack are found to be equally efficient in purification of coolant system from the added reducing agents. Uptake of metal ions was observed to be higher on SAC resin column in presence of reducing agent. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44588.