Fissile radionuclides in thyroid of the inhabitants of the gomel region in belarus and peculiarities of their distribution

Malenchenko, A.F.; Kanash, N. V.; Bazhanova, N. N.; Zhuk, I.V.; Lomonosova, E.M.; Kievetz, M.K.; Boulyga, Sergei F.

doi:10.1016/s1350-4487(97)00107-8

Cited by 2 publications

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“…Uncontrolled discharge of uranium contaminated water has a potential risk to environment and public health (Malenchenko et al 1997). In nature, uranium occurs in tetravalent [U(IV)] and hexavalent [U(VI)] oxidation states, the latter being very mobile, and exists predominantly as carbonate complex in groundwater bodies (Brooks et al 2003).…”

Section: Introductionmentioning

confidence: 99%

A new approach using polyvinylidene fluoride immobilised calf-intestinal alkaline phosphatase for uranium bioprecipitation

Venu-Babu

Chaudhuri

Thilagaraj

2017

Int. J. Environ. Sci. Technol.

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Uranium is a predominant radionuclide arising out of operations of mining, milling and fuel fabrication for nuclear power plants. While chemical and biological methods using several micro-organisms have been employed for the remediation of uranium from such effluents, use of immobilised enzymes for the purpose has not been reported. The current investigation deals with a purified calf-intestinal alkaline phosphatase which is capable of driving uranium precipitation in the presence of a phosphate-containing substrate. The enzyme, both in free form and in an immobilised form on polyvinylidene fluoride membrane, was investigated for the precipitation of uranium using para-nitrophenyl phosphate as substrate. The results indicated that while the enzyme in free form could precipitate most of the uranium within 6 h, the immobilised enzyme could achieve the same in 24 h. There was a spurt in the precipitation of uranium by the immobilised enzyme during the initial period of 3 h followed by a linear increase for the remaining period. The immobilised enzyme was found to be stable and catalytically active for 3 years in precipitating uranium. The results obtained offer polyvinylidene fluoride immobilised alkaline phosphatase from calf intestine as a new tool for the remediation of uranium from effluents. Further, evidence has been also shown that no requirement for any cellular architecture/ scaffolding exists for uranium mineralisation to occur.

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Section: Introductionmentioning

confidence: 99%