A Method for Determining the Oxidation State of Uranium at Concentration as Low AS 1010M

1988 ◽  
Vol 127 ◽  
Author(s):  
M. Hussonnois ◽  
R. Guillaumont ◽  
L. Brillard ◽  
M. Fattahi
Keyword(s):  
Hydrochloric Acid ◽  
Oxidation State ◽  
Aqueous Media ◽  
Oxidation Kinetic ◽  
Free Hydrochloric Acid ◽  
Chemical Procedure ◽  
Tetravalent State

ABSTRACTThis paper describes the development and testing of a chemical procedure for determining the tetravalent and hexava-lent states of uranium in aqueous media at concentration as low as 10−10M. Results show the U(IV) stability towards fast modifications of the pH of the solution with oxygen free hydrochloric acid. Some results on the oxidation kinetic of the uranium tetravalent state versus the HCl and uranium concentrations as well as the Fe(III) content are presented.

Three new staphylonuclear chloromolybdates : K6Mo3Cl12, (NH4)7Mo3Cl13,H2O, and Cs6Mo4Cl16

1965 ◽  
Vol 18 (3) ◽  
pp. 271 ◽  
Author(s):  
IR Anderson ◽  
JC Sheldon
Keyword(s):  
Solid State ◽  
Hydrochloric Acid ◽  
Absorption Spectra ◽  
Oxidation State ◽  
Chlorine Atom ◽  
Reducing Agents ◽  
Ammonium Salts ◽  
Chlorine Atoms ◽  
Regular Triangle ◽  
New Compounds

The new compounds, K6Mo3IICl12; (NH4)7Mo3IICl13.H2O; and Cs6Mo4Cl16 (containing molybdenum in oxidation state +2.5) have been precipitated by the appropriate cation from solutions of molybdenum(II) acetate in 12M hydrochloric acid. The absorption spectra of potassium and ammonium salts are similar in the solid state and solution. Since the compounds are strong reducing agents and short-lived in solution, their formulation as a staphylonuclear (i.e. metal-clustered) trimer or tetramer rests on their diamagnetism, stoicheiometry, and spectral similarities. It is proposed that the chloromolybdates adopt entirely novel, compact polymers by stacking the chlorine atoms into "close packed" layers. The Mo3Cl13 group consists of two layers of chlorine atoms (seven and six) generating three octahedral locations for the molybdenum atoms at the corners of a regular triangle. The Mo3Cl12 group is similar but deficient in one chlorine atom. The Mo4Cl16 group is related to Mo3Cl13 and consists of three layers of chlorine atoms (seven, six, and three) providing four octahedral locations for the molybdenum atoms at the corners of a tetrahedron.

New reaction for free hydrochloric acid

1906 ◽  
Vol 6 (1) ◽  
pp. 58-58
Author(s):  
F. Simon
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Gastric Juice ◽  
Free Hydrochloric Acid ◽  
Blue Coloration

For the discovery of free hydrochloric acid in gastric juice, Dr. Simon proposes a new reaction based on the properties of guaiac gum to oxidize in the presence of various oxidants (for example, nitric acid) and give a characteristic blue coloration.

scholarly journals Chromatographic separation of In(III) from Cd(II) in aqueous solutions using commercial resin (Dowex 50W-X8)

2010 ◽  
Vol 8 (3) ◽  
pp. 696-701 ◽  
Author(s):  
Ayman Massoud ◽  
F. Abou El-Nour ◽  
H. Killa ◽  
U. Seddik
Keyword(s):  
Hydrochloric Acid ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Chromatographic Separation ◽  
Contact Time ◽  
Ph Value ◽  
Aqueous Media ◽  
Cadmium Ions ◽  
Initial Concentration ◽  
Commercial Resin

AbstractThis work assesses the potential of an adsorptive material, Dowex 50w-x8, for the separation of indium ions from cadmium ions in aqueous media. The adsorption behavior of Dowex 50 w-x8 for indium and cadmium ions was investigated. The effect of pH, initial concentration of metal ions, the weight of resins, and contact time on the sorption of each of the metal ions were determined. It was found that the adsorption percentage of the indium ions was more than 99% at pH 4.0. The result shows that In (III) was most strongly extracted, while Cd(II) was slightly extracted at this pH value. The recovery of In(III) and Cd(II) ions is around 98% using hydrochloric acid as the best eluent.

scholarly journals PERNICIOUS ANEMIA FROM ADDISON TO FOLIC ACID

Blood ◽  
1948 ◽  
Vol 3 (6) ◽  
pp. 702-702
Author(s):  
RUSSELL L. HADEN
Keyword(s):  
Folic Acid ◽  
Hydrochloric Acid ◽  
Pernicious Anemia ◽  
Free Hydrochloric Acid

Abstract The editorial footnote in "Pernicious Anemia from Addision to Folic Acid," by Dr. Russell L. Haden, in the January Blood (3:-24, 1948) should have read: "Wilkinson and Israëls, Waldenström and others report that free hydrochloric acid occurs in approximately 1 case of 100." The term "achlorhydria" was used in error.

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