Impact of Physico-Chemical Heterogeneity on Arsenic Sorption and Reactive Transport under Water Extraction

2020 ◽  
Vol 54 (23) ◽  
pp. 14974-14983
Author(s):  
Yanhua Duan ◽  
Rong Li ◽  
Yiqun Gan ◽  
Kai Yu ◽  
Jiarong Tong ◽  
...  
Keyword(s):  
Reactive Transport ◽  
Water Extraction ◽  
Chemical Heterogeneity ◽  
Physico Chemical

A physico-chemical study on the polysaccharide ulvan from hot water extraction of the macroalga Ulva

1999 ◽  
Vol 25 (4) ◽  
pp. 309-315 ◽  
Author(s):  
Gaio Paradossi ◽  
Francesca Cavalieri ◽  
Laura Pizzoferrato ◽  
Alfonso M. Liquori
Keyword(s):  
Chemical Study ◽  
Hot Water ◽  
Water Extraction ◽  
Hot Water Extraction ◽  
Physico Chemical

Effect of physico-chemical heterogeneity of natural complexants

1990 ◽  
Vol 232 ◽  
pp. 225-237 ◽  
Author(s):  
J. Buffle ◽  
R.S. Altmann ◽  
M. Filella
Keyword(s):  
Chemical Heterogeneity ◽  
Physico Chemical

scholarly journals Physico-Chemical Heterogeneity of Organic-Rich Sediments in the Rifle Aquifer, CO: Impact on Uranium Biogeochemistry

2015 ◽  
Vol 50 (1) ◽  
pp. 46-53 ◽  
Author(s):  
Noémie Janot ◽  
Juan S. Lezama Pacheco ◽  
Don Q. Pham ◽  
Timothy M. O’Brien ◽  
Debra Hausladen ◽  
...  
Keyword(s):  
Chemical Heterogeneity ◽  
Physico Chemical

Physico-chemical heterogeneity of natural complexants: Clarification

1995 ◽  
Vol 313 (1-2) ◽  
pp. 144-150 ◽  
Author(s):  
Jacques Buffle ◽  
Montserrat Filella
Keyword(s):  
Chemical Heterogeneity ◽  
Physico Chemical

Modeling spent nuclear fuel alteration and radionuclide migration in disposal conditions

2006 ◽  
Vol 94 (9-11) ◽  
Author(s):  
Laurent de Windt ◽  
H. Schneider ◽  
C. Ferry ◽  
H. Catalette ◽  
V. Lagneau ◽  
...  
Keyword(s):  
Reactive Transport ◽  
Spent Nuclear Fuel ◽  
Transport Model ◽  
Near Field ◽  
Radioactive Decay ◽  
Steel Corrosion ◽  
Spent Fuel ◽  
Fuel Pellets ◽  
Physico Chemical ◽  
Integrated Performance

A physico-chemical model developed for spent fuel alteration was integrated in a global reactive transport model of a spent fuel disposal system, considering both decaying and stable isotopes, corroded steel canisters, bentonite backfills and a clayey host-rock. Fuel evolution took into account radiolytic-enhanced corrosion and long-term solubility-controlled dissolution as well as instantaneous release fractions. The calculations show that spent-fuel dissolution has no significant alteration effect on the near-field components except an oxidizing plume in the vicinity of the waste packages. The dissolved uranyl species, partly precipitate as schoepite on the fuel pellets, and partly diffuse in the near-field where magnetite and pyrite reduce U(VI) to yield uraninite precipitation. Under disposal conditions, preliminary calculations indicate that steel corrosion may generate sufficient dissolved hydrogen as to react with radiolytic oxidants and inhibit fuel dissolution. The formation of a protective schoepite layer could also reduce the alteration of fuel pellets. Radionuclides migration (Am, Cs, I) in the near-field is discussed in a second stage discriminating between sorption, precipitation and radioactive decay processes. The migration of Cs is translated in terms of cumulative activity profiles useful for integrated performance assessment.

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