scholarly journals Ex-situ and in-situ spectroscopic studies of the passive film on alkali and alkaline earth metals in nonaqueous solvents

1992 ◽  
Author(s):  
K. Wang ◽  
G.S. Chottiner ◽  
P. Herrera-Fierro ◽  
D.A. Scherson
Keyword(s):  
Passive Film ◽  
Alkaline Earth ◽  
Spectroscopic Studies ◽  
Nonaqueous Solvents ◽  
Alkaline Earth Metals ◽  
Ex Situ

The Use of Some Ion-Exchange Sorbing Tracer Cations in Insitu Experiments in High Saline Groundwaters

1994 ◽  
Vol 353 ◽  
Author(s):  
J. Byegård ◽  
G. Skarnemark ◽  
M. Skålberg
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Exchange Capacity ◽  
Alkaline Earth Metals ◽  
Crushed Granite ◽  
The Difference

AbstractThe possibility to use alkali metals and alkaline earth metals as slightly sorbing tracers in in-situ sorption experiments in high saline groundwaters has been investigated. The cation exchange characteristics of granite and some fracture minerals (chlorite and calcite) have been studied using the proposed cations as tracers. The results show low Kd’s for Na, Ca and Sr (∽0.1 ml/g), while the sorption is higher for the more electropositive cations (Rb, Cs and Ba). A higher contribution of irreversible sorption can also be observed for the latter group of cations. For calcite the sorption of all the tracers, except Ca, is lower compared to the corresponding sorption to granite and chlorite. Differences in selectivity coefficients and cation exchange capacity are obtained when using different size fractions of crushed granite. The difference is even more pronounced when comparing crushed granite to intact granite.

Location of trace elements in soil profiles: total contents of particle-size separates

1991 ◽  
Vol 82 (3) ◽  
pp. 195-209 ◽  
Author(s):  
M. L. Berrow ◽  
R. L. Mitchell
Keyword(s):  
Particle Size ◽  
Trace Elements ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Fine Sand ◽  
Alkaline Earth Metals ◽  
Soil Profiles

Total contents of 21 trace elements were determined in particle size separates from the horizons of four profiles, two freely drained and two very poorly drained, of Scottish soils on drifts of basic igneous and granitic origin. Trace elements, including Co, Cu, Li, Mn, Ni, V, Zn and also Fe contained in the more easily weathered ferromagnesian minerals, tend to accumulate in the clay and silt. Elements such as Ti and Zr and also La and Y contained in resistant minerals accumulate in the silt or fine sand. Ti and Zr are mobilised to some extent, however, as these elements are present in the clay separates and in some cases show enrichment therein.The alkali metals Li and Rb accumulate in the silt and clay particularly in the granitic soils, while the alkaline earth metals Ba and Sr occur in greatest concentrations in the sands due to their being held largely in resistant feldspar minerals. On release these elements are not strongly adsorbed by the clay.Very poor pedological drainage leads to increased weathering and release of such elements as Co, Cu, Ni, V and Zn from the coarse or fine sands with correspondingly greater enrichment of the associated silt and clay. Weathering and enrichment of the fine fractions takes place largely in situ, there being little evidence of downward translocation due to leaching.

Effect of Alkali and Alkaline Earth Metals on in-Situ Catalytic Fast Pyrolysis of Lignocellulosic Biomass: A Microreactor Study

2016 ◽  
Vol 30 (4) ◽  
pp. 3045-3056 ◽  
Author(s):  
Ravishankar Mahadevan ◽  
Sushil Adhikari ◽  
Rajdeep Shakya ◽  
Kaige Wang ◽  
David Dayton ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Alkaline Earth ◽  
Fast Pyrolysis ◽  
Alkaline Earth Metals ◽  
Catalytic Fast Pyrolysis
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