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• W1567148991 abstract "Dissolution of the synthetic erythrite [Co3(AsO4)2.8H2O] and annabergite [Ni3(AsO4)2.8H2O] was studied at 25°C and different pH values in a series of batch experiments. The X-ray diffraction, Fourier transformed infrared spectrophotometer and scanning electron microscopy analyses indicated that the synthetic erythrite and annabergite used in the experiments were found to have no obvious variation after 2880 h of dissolution. The releases of cobalt, nickel and arsenate into pH 2 solution were significantly higher than that into solution with initial pH 6 or 9. The release of cobalt and nickel into the bulk solution was always less when compared with release of arsenate. Within the first 24–48 h of dissolution, the solution pH increased rapidly and then decreased slightly until it approached a steady state. During the dissolution in pH 2 solution, the aqueous Co, Ni and As concentrations increased rapidly in the first hour and then decreased after 72–120 h. After that time they increased gradually once again and finally approached a steady state. The mean Ksp values were calculated by using PHREEQC for erythrite of 10−34·02 (10−33·53–10−34·68) at 25°C and for annabergite of 10−30·77 (10−29·83–10−32·57) at 25°C, the Gibbs free energies of formation and were calculated to be −3551·62 and −3506·68 kJ mol−1 respectively.On a étudié la dissolution de l’érythrite [Co3(AsO4)2.8H2O] et de l’annabergite [Ni3(AsO4)2.8H2O] synthétiques à 25°C et à différentes valeurs de pH dans une série d’expériences en discontinu. Les analyses de XRD, de FTIR et de SEM ont indiqué que l’érythrite et l’annabergite synthétiques utilisées dans les expériences n’avaient pas de variation apparente après 2880 h de dissolution. Les relâchements de cobalt, de nickel et d’arséniate dans la solution à pH 2 étaient significativement plus élevés que ceux de la solution à pH initial de 6 ou 9. Le relâchement du cobalt et du nickel dans le volume de la solution était toujours moindre lorsque comparé au relâchement d’arséniate. Dans les premières 24 à 48 h de dissolution, le pH de la solution augmentait rapidement et ensuite diminuait légèrement jusqu’à ce qu’il approche un régime permanent. Lors de la dissolution dans la solution à pH 2, les concentrations aqueuses de Co, Ni et As augmentaient rapidement dans la première heure et ensuite diminuaient après 72 à 120 h. Après cette période, elles augmentaient graduellement une fois de plus et finalement approchaient un régime permanent. On a calculé les valeurs moyennes de Ksp en utilisant PHREEQC, avec une valeur de 10−34·02 (10−33·53–10−34·68) à 25°C pour l’érythrite et une valeur de 10−30·77 (10−29·83–10−32·57) à 25°C pour l’annabergite, et l’on a calculé les énergies libres de formation de Gibbs et à −3551·62 et −3506·68 kJ mol−1 respectivement." @default.
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• W1567148991 date "2013-01-01" @default.
• W1567148991 modified "2023-09-26" @default.
• W1567148991 title "Characterisation, dissolution and solubility of synthetic erythrite [Co3(AsO4)2.8H2O] and annabergite [Ni3(AsO4)2.8H2O] at 25°C" @default.
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• W1567148991 doi "https://doi.org/10.1179/1879139512y.0000000030" @default.
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