Géoinformatique et géostatistique : un aperçu

Uranium in Groundwater Precipitated in Reducing Environments Caused by Degradation of Ancient Wood and Organic Debrib

Chenglei Chongkun

Uranium (U) is of huge worldwide significance due to its utilization in energy age, yet with expected natural inheritances. While normally happening U is inescapable in the Earth’s outside layer at centralizations of ~ 1 to 3 ppm, higher fixations can be found, including inside natural matter (OM) rich silt, prompting monetary extraction openings. The essential determinants of U conduct in mineral frameworks are pH, Eh, U oxidation state (U(IV), U(VI)) and the bounty of CO32–particles. The fixation/accessibility and interrelationships among such determinants change, and the dissolvability and versatility of particles that seek U (essentially as U(VI)) will likewise impact the portability of U. Moreover, the presence of OM can impact U versatility and destiny by the level of OM sorption to mineral surfaces (for example Fe-and Si-oxides and hydroxides). Inside strong stage OM, microorganisms can impact U oxidation state and U steadiness through direct enzymatic decrease, bio sorption, bio mineralisation and bioaccumulation. The biogenic UO2 item is, be that as it may, answered to be promptly defenceless to oxidation and along these lines almost certain remobilised throughout longer time-frames. In this manner a few spaces of vulnerability stay as for factors adding to U amassing, steadiness as well as (re)mobilisation. To address these vulnerabilities, this paper surveys U elements at both geographical and sub-atomic scales.