Geochemical Speciation of Actinides in Soil and Solution

2015 ◽  
pp. 45-59
Author(s):  
Wolfgang Runde ◽  
Mary P. Neu ◽  
Steve D. Conradson ◽  
Dien Li ◽  
Mavis Lin ◽  
...  
Keyword(s):  
Geochemical Speciation

Geochemical speciation and risk assessment of metals in the river sediments from Dan River Drainage, China

2016 ◽  
Vol 32 (3) ◽  
pp. 221-237 ◽  
Author(s):  
Qingpeng Meng ◽  
Jing Zhang ◽  
Jicheng Feng ◽  
Zhaoyu Zhang ◽  
Tairan Wu
Keyword(s):  
Risk Assessment ◽  
River Sediments ◽  
River Drainage ◽  
Geochemical Speciation

Bamboo-biochar and hydrothermally treated-coal mediated geochemical speciation, transformation and uptake of Cd, Cr, and Pb in a polymetal(iod)s-contaminated mine soil

2020 ◽  
Vol 265 ◽  
pp. 114816 ◽  
Author(s):  
Mehr Ahmed Mujtaba Munir ◽  
Guijian Liu ◽  
Balal Yousaf ◽  
Muhammad Ubaid Ali ◽  
Ayesha Imtiyaz Cheema ◽  
...  
Keyword(s):  
Mine Soil ◽  
Geochemical Speciation

Summer–winter transitions in Antarctic ponds: III. Chemical changes

2011 ◽  
Vol 24 (2) ◽  
pp. 121-130 ◽  
Author(s):  
Jenny Webster-Brown ◽  
Ian Hawes ◽  
Karl Safi ◽  
Brian Sorrell ◽  
Nathaniel Wilson
Keyword(s):  
Trace Elements ◽  
Water Column ◽  
Ice Shelf ◽  
Toxic Trace Elements ◽  
Mineral Phases ◽  
Show Evidence ◽  
Speciation Modelling ◽  
Geochemical Speciation ◽  
Inorganic Solutes ◽  
High Concentrations

AbstractObservations were made of water column chemistry in four Na-Cl dominated ponds on the McMurdo Ice Shelf from the end of January to early April in 2008. During that time the ponds went from ice-free to predominantly frozen, with only a small volume of residual hypoxic, saline liquid trapped at the base of each pond. Changes in the concentrations of inorganic solutes with time distinguished Na, Cl, Mg, K, SO4, As, U and Mn as ions and trace elements that behave mainly conservatively during freezing, from those which are affected by biological processes (removing HCO3) and the precipitation of mineral phases such as calcite (removing Ca and more HCO3). Dissolved Fe, Mo, Cu and Zn also show evidence of precipitation from the water column during freezing; geochemical speciation modelling predicts the formation of stable insoluble mineral phases such as Fe oxides and oxyhydroxides while conditions are oxic, and Fe-, Cu-, Mo- and Zn-sulphide minerals in the presence of H2S. Consequently, under winter conditions, residual liquid beneath the ice in such ponds is anticipated to be an anoxic Na-Cl brine with the capacity to develop high concentrations of toxic trace elements such as As and U.

A new approach to multiphase geochemical speciation modeling

2012 ◽  
Vol 27 (9) ◽  
pp. 1724-1737 ◽  
Author(s):  
R.J. Perez ◽  
R.A. Heidemann ◽  
E.C. Perez
Keyword(s):  
New Approach ◽  
Geochemical Speciation

Bayesian calibration of thermodynamic parameters for geochemical speciation modeling of cementitious materials

2012 ◽  
Vol 42 (7) ◽  
pp. 889-902 ◽  
Author(s):  
S. Sarkar ◽  
D.S. Kosson ◽  
S. Mahadevan ◽  
J.C.L. Meeussen ◽  
H. van der Sloot ◽  
...  
Keyword(s):  
Thermodynamic Parameters ◽  
Cementitious Materials ◽  
Bayesian Calibration ◽  
Geochemical Speciation
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