The Commodification and Profit Extraction Mechanism of Inadequate Housing: The Cases of (Semi-)basement Houses, Gosiwons, and Jjokbangs in Seoul, Korea

2021 ◽  
Vol 24 (3) ◽  
pp. 73-87
Author(s):  
Jinyoung Jung
Keyword(s):  
Extraction Mechanism ◽  
Inadequate Housing

Extraction of hafnium(IV) with N-benzoyl-N-phenylhydroxylamine solutions from strongly acid solutions containing dimethyl sulphoxide or hexamethylphosphor triamine

1984 ◽  
Vol 49 (10) ◽  
pp. 2205-2209
Author(s):  
Jiří Příhoda ◽  
Alois Zeman
Keyword(s):  
Ion Exchange ◽  
Dimethyl Sulfoxide ◽  
Dimethyl Sulphoxide ◽  
Polar Phase ◽  
Acid Solutions ◽  
Extraction Mechanism

The extraction of hafnium(IV) with N-benzoyl-N-phenylhydroxylamine solutions in chloroform or toluene from strongly acid (HClO4) solutions of dimethyl sulfoxide or hexamethylphosphor triamide has been studied. These substances were found to suppress the conversion of the extraction mechanism from ion exchange to solvation: while in solutions free of these substances this conversion takes place at HClO4 concentrations of about 4 mol l-1, in the mixed aqueous-organic (polar) phase the requisite acid concentrations are considerably higher. The possible causes of this effect are discussed.

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

Advances in the Plant Protein Extraction: Mechanism and Recommendations

2021 ◽  
pp. 106595
Author(s):  
Manoj Kumar ◽  
Maharishi Tomar ◽  
Jayashree Potkule ◽  
Reetu Verma ◽  
Sneh Punia ◽  
...  
Keyword(s):  
Protein Extraction ◽  
Plant Protein ◽  
Extraction Mechanism
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