Radionuclides in ground waters from observation holes in the Shelter local area

Odintsov, A. A.; Khan, V. E.; Krasnov, V. A.; Pazukhin, É. M.

doi:10.1134/s1066362207050165

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…It is shown in works [31][32][33] that in natural waters caesium is able to form various colloids and weak complex compounds with organic ligands. In absence of complexing agents caesium presents in water solutions mainly as simple monovalent ion [34].…”

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confidence: 99%

Peculiarities of sorption isotherm and sorption chemisms of caesium by mixed nickel–potassium ferrocyanide based on hydrated titanium dioxide

Воронина

Семенищев

Nogovitsyna

et al. 2013

J Radioanal Nucl Chem

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Sorption isotherm of caesium from tap water by mixed nickel-potassium ferrocyanide based on hydrated titanium dioxide is obtained for a wide range of concentrations of caesium. It is shown that there are three types of specificity to caesium sorption sites in this sorbent. Sorption chemisms of caesium are studied, factors conditioned high sorption capacity of the sorbent are revealed. It is shown that occupation of sorption sites I and II is well approximated by Langmuir equilibrium and this process can be described within the bounds of theory of ion exchange. The expected sorption chemism of caesium by sorption sites III at high concentrations of caesium ([50 mg L -1 ) is precipitation of mixed nickel-caesium ferrocyanide in pore space of the sorbent.

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confidence: 99%

Peculiarities of sorption isotherm and sorption chemisms of caesium by mixed nickel–potassium ferrocyanide based on hydrated titanium dioxide

Воронина

Семенищев

Nogovitsyna

et al. 2013

J Radioanal Nucl Chem

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“…As shown in [17][18][19], in natural waters cesium can form colloids and weak complexes with organic ligands. The formation of pseudoradiocolloids (sorption colloids) in tap water will be associated with spontaneous transfer of trace amounts of cesium from the liquid phase onto the surface of heterogeneous impurities present in natural waters.…”

Section: Effect Of Cesium Colloid Formation On the Sorption Kineticsmentioning

confidence: 99%

Kinetic features of cesium sorption onto a polyfunctional ferrocyanide sorbent

Воронина

Nogovitsyna

2015

Radiochemistry

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The kinetics of cesium sorption onto mixed nickel potassium ferrocyanide supported on hydrated titanium dioxide were studied in different ranges of cesium concentrations. At the cesium concentration in solution from 2 × 10 -7 to 5 mg L -1 , the sorption rate is determined by external diffusion of cesium ions in solution, heterogeneous ion-exchange reaction, and internal diffusion of cesium in the pore space of the sorbent. The slowest step is the breakdown of sorption colloids and uptake of the released cesium ions by the sorbent. At the cesium concentration in solution higher than 50 mg L -1 , the rate-determining step is the precipitation of mixed nickel cesium ferrocyanide in the pore space of the sorbent.

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Plutonium: Radionuclides

Neu¹,

Goff²,

Runde³

2005

Encyclopedia of Inorganic Chemistry

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Plutonium is the most debated actinide element because of its dual use in devastating nuclear weapons and beneficial generation of nuclear energy. Plutonium metal exists in several allotropic phases and plutonium in solution exhibits a rich and complex chemistry. The ability to exist in up to four oxidation states makes plutonium unique among all elements. Pu(III) and Pu(VI) form only under reducing or oxidizing conditions, respectively; whereas Pu(IV) and Pu(V) have broad stability ranges within the geochemical bounds of environmental systems. When Pu(IV) is above trace concentration and particulate matter is present, then solids or suspended colloids are the predominant chemical forms. In contrast, Pu(V), as PuO $_{2}^{+}$ , has relatively higher solubility as an aquo species or a monomeric complex of natural ligands (hydroxide, chloride, sulfate, etc.). Stronger complexing, polydentate ligands, such as carbonate and organics, tend to increase plutonium solubility by forming very stable Pu(IV) complexes. Minerals, high molecular weight organic matter, and bacteria can either increase or decrease the solubility of plutonium, depending upon their chemical properties, mechanisms of interaction, and the geochemical conditions of the surrounding environment. Plutonium generally has very low solubility, low mobility, and few health consequences from environmental forms, and therefore poses little risk to living systems under nearly all conditions. This article provides a brief overview of the chemistry and behavior of plutonium in aqueous solutions and in the environment.

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Radionuclides in ground waters from observation holes in the Shelter local area

Cited by 8 publications

References 3 publications

Peculiarities of sorption isotherm and sorption chemisms of caesium by mixed nickel–potassium ferrocyanide based on hydrated titanium dioxide

Peculiarities of sorption isotherm and sorption chemisms of caesium by mixed nickel–potassium ferrocyanide based on hydrated titanium dioxide

Kinetic features of cesium sorption onto a polyfunctional ferrocyanide sorbent

Plutonium: Radionuclides

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