Oxidative degradation of EDTA in aqueous solutions under UV irradiation

Determination of Elemental Impurities in Acyclovir Ointment and Raw Materials Using Microwave Acid Digestion (MW-AD) and ICP-MS

“…Finally, disodium edetate (EDTA disodium), (Figure 2, compound 3) presented the lower RCC value when compared with methylparaben and acyclovir-API. Although the exact mechanism of EDTA degradation in concentrated nitric acid assisted by microwave radiation is not clear, the EDTA molecule becomes unstable in the presence of strong oxidizing agents, such as HNO 3 , as suggested by Seliverstov et al 28 The residual carbon content values can be observed in Table 4.…”

Development of a purification technology for treatment of medium- and low-activity radioactive waste of radiochemical production from Co-60 and Cs-137

“…The developed method has significant advantages over the known (indicated earlier [3]- [7]) methods of purification of LRW generated at radiochemical plants and nuclear power stations due to a more complete oxidation of organic components of LRW in the dynamic mode of the column operation during considerably less time available for contact (50÷130 sec) combined with high efficiency of the column (3÷15 column volume/per hour), at lower temperature of the process (47,5÷80°ɋ). A column with the filling layer of a catalyst and a dynamic mode of oxidation decomposition stage condition simple hardware arrangement of the process.…”

“…The installation includes: a stock bottle with stock solution of LRW (1), membrane pumps (2,6,9,12,15), a catalytic oxidation column [14] (3), a thermostat (4), a stock bottle for receiving solution from the catalytic column (5), «mixer tank-settling tank» reactors (for every operation of coagulation and precipitation stage, and which have sedimentary residue zones and decantate removal zones) equipped with an agitator (7,10,13), receiving filters with remotely-removable fluoroplastic cartridges (8,11,14), ion-exchanging column (16), control valves (ȼ01÷ȼ33). …”

“…The main drawbacks of this method are: insufficiently effectiveness of a special stage of 60Co extraction from the solution after ozonation and, as a result, inefficient removal of 60Co, that requires concentrating the filtrate by evaporation; high power consumption of the process; increased reagent consumption (ozone); need to keep constant ɪɇ level; as well as exclusive fire-and explosion safety requirements during the process. LRW stillage residue is also purified from radioactive cobalt and cesium by oxidation of stillage residue with hard ultra-violet rays (UF) and removal of corrosion products by filtration [6,7]. We must also note low efficiency and technological complexity of arranging LRW oxidation in dynamic regime, technological complexity of arranging LRW oxidation in the static regime due to the process time (over 6 hours), reduced efficiency of UV-lamp when the salt content is over 10 g/l and increased turbidity leading to inefficient oxidative destruction of organic components of LRW and removal of radionuclides.…”

Voltammetric monitoring photodegradation of EDTA based on carbon nanotubes-modified electrode

“…Thus, controlling the effluent of EDTA waste has become an emerging task in the environmental protection. Some advanced oxidation processes such as UV/H 2 O 2 [3][4][5], photocatalysis [6], Fenton's reagent [7], ultrasound [8], chemical oxidation [9], Fe-M catalyst [10] and permanganate [11] have been considered as the clean and ecologically safe treatment methods for the effective degradation of EDTA.…”