PART A. COPRECIPITATION FROM HOMOGENEOUS SOLUTION. PART B. ANALYTICAL CHEMISTRY OF THORIUM. PROGRESS REPORT FOR PERIOD SEPTEMBER 1, 1952 TO JUNE 2, 1953

Technical Report · Mon Jun 01 00:00:00 EDT 1953

OSTI ID:4248905

Gordon, L

An account of studies on coprecipitation from homogeneous solutions is presented. Basic Stannic Sulfate: In solutions initially 10/sup -3/ M in tin(IV) and 10/sup -3/ M in manganese(II), the extent of coprecipitation of the latter on basic stannic sulfate precipitated by the urea method is increased with increasing rate of precipitation. However, at a given rate (86 deg C) much of the foreign ion is coprecipitnted during the separation of the initial 25% of the total carrier present. Only a negligible amount of the foreign ion is then further coprecipitated as the remainder of the carrier is precipitated up to the point where approximately 99.9% of the total initially present has been separated. Afier complete precipitation has occurred the adsorption of foreign ions by the carrier becoines appreciable and causes a sharp rise in the total amount of coprecipitation. With a very slow rate of precipitation (76 deg C), where the basic stannic sulrate is precipitated over a period of about 30 hours, there is a complete elimination of the initial coprecipitation effect. After about 50% of the carrier has been precipitated, there occurs a small and steadily increasing amount of coprecipitation until most of the tin has been separated at which point there is again, as before, a sharp rise in the total amount of coprecipitation. Barium Sulfate: A study was made of the distribution coefficient of Sr with barium sulfate as carrier. Fractions of the latter were precipitated from homogeneous solution by the hydrolysis of dimethyl sulfate in 20% methyl alcohol at 83 deg C. The distribution is logarithmic in accordance with the formulation of Doerner and Hoskins. Ferric lodate: A method was devised fur the precipitation of ferric iodate from homogeneous solution. Precipitition is effected with ethylene diacetate and sodium periodate. Hydrolysis of the ester produces ethylene glycol which then reduces periodate, thus precipitating ferric iodate in a dense and readily filtorable form suitable for coprecipitation studies. Silver Chloride: A study was initiated to determine the distribution of thallium(I) between silver chloride and the solution in which precipitation is effected. Thorium lodate: Thorium iodate may be precipitated from homogeneous solution in a dense and granular form with iodate produced by the reduction of periodate with ethylene glycol; the latter is slowly produced by the hydrolysis of %BB-hydroxyethyl acetate. The precipitate thus obtained is easily washed and filtered. Thorium Oxalate: As part of a study of coprecipitation with thorium oxalate it becomes necessary to determine the solubility losses of thorium oxalate due to the presence of ammonium salts. Of the several methods tested the procedure by Ewing and Banks STAAnal. Chem. 20, 233 (1948)! gives satisfactory results. However, if rare earths are present to act as carriers for any residual thorium in solution, ammonium salts do not interfere. Also included are abstracts of reports on precipitation of iodates, determination of tin, and coprecipitation from homogeneous solution. (For preceding period see NYO-3186.) (J.R.D.)

• Research Organization: Syracuse Univ., N.Y.
• DOE Contract Number: AT(30-1)-1213
• NSA Number: NSA-13-016768
• OSTI ID: 4248905
• Report Number(s): NYO-3191
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-59
• Country of Publication: United States
• Language: English

Related Subjects

CHEMISTRY
ACETATES
ADSORPTION
ALCOHOLS
AMMONIUM COMPOUNDS
BARIUM SULFATES
CHEMICAL REACTIONS
DENSITY
ESTERS
ETHYLENE
GRAIN SIZE
HYDROLYSIS
IODATES
IODIC ACID
IODINE COMPOUNDS
IRON COMPOUNDS
LOSSES
MANGANESE
METHANOL
METHYL RADICALS
MINERAL ACIDS
OXALATES
PRECIPITATION
QUANTITY RATIO
RARE EARTHS
REACTION KINETICS
REPORT
SEPARATION PROCESSES
SILVER CHLORIDES
SOLUBILITY
SOLUTIONS
STRONTIUM
SULFATES
THALLIUM
THORIUM
THORIUM COMPOUNDS
TIN
TIN SULFATES
UREA