Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Uranyl Nitrate Hexahydrate Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Uranyl Nitrate Hexahydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Insoluble Matter, Chloride, Sulfate, Alkalis, Alkaline Earths, Heavy Metals, Iron, and Substances Reducing Permanganate.
UO2(NO3)2 • 6H2O
Formula Wt 502.12
CAS No. 13520-83-7
Note: The formula weight of this reagent is likely to deviate from the value cited because the natural distribution of uranium isotopes is often altered in current sources of uranium compounds.
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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yellow solid precipitation of sodium and magnesium melting point, 60 °C 122 g in 100 mL
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.0–102.0% UO2(NO3)2 · 6H2O Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.005% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.002% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Alkalis and alkaline earths (as sulfates) . . . . . . 0.1% Heavy metals (as Pb) . . . . . . . . . . . . . . . . . . 0.002%
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4418 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002% Substances reducing permanganate (as UIV) . . . . 0.06%
TESTS Assay (By gravimetry for uranium). Weigh accurately about 0.5 g, and dissolve in 100 mL of water in a 250 mL beaker. Heat the solution to boiling, and add ammonium hydroxide, free from carbonate, until precipitation is complete. Filter through a tared Gooch crucible, wash with 1% ammonium nitrate solution, and ignite gently with free access to air, to constant weight.
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 20 g dissolved in 200 mL of water.
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For the Determination of Chloride, Sulfate, Alkalis and Alkaline Earths, Heavy Metals, and Iron
S a m p l e S o l u t i o n A . Dissolve 10.0 g in 200 mL of water, add 7 g of ammonium acetate and 10 mL of 30% hydrogen peroxide, and heat to coagulate the precipitate. Decant through a fritted-glass filter, without washing, and dilute with water to 250 mL in a volumetric flask (1 mL = 0.04 g).
Chloride† [Part 2: Colorimetry and Turbidimetry; Chloride]. Dilute 10 mL of sample solution A (0.5 g sample) with water to 20 mL.
Sulfate† [Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Evaporate 20 mL of sample solution A (1 g sample) to 10 mL.
Alkalis and Alkaline Earths† To 20 mL of sample solution A (1 g sample), add 0.10 mL of sulfuric acid, evaporate to dryness in a tared, preconditioned evaporating dish, and ignite at 600 ± 25 °C for 15 min.
Heavy Metals† [Part 2: Colorimetry and Turbidimetry; Heavy Metals (as Lead); Procedure for Heavy Metals, Method 1]. Evaporate 20 mL of sample solution A (1 g sample) to dryness, dissolve the residue in about 20 mL of water, and dilute with water to 25 mL.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4418 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Iron
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[Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. Use 10 mL of sample solution A (0.5 g sample).
Substances Reducing Permanganate Prepare two solutions, each containing 3.0 g in 200 mL of dilute sulfuric acid (1:99). Titrate one solution with 0.1 N potassium permanganate volumetric solution. Not more than 0.20 mL of permanganate should be required to cause a color change that can be observed by comparison with the solution not titrated. The 0.20 mL includes 0.05 mL allowed to produce the color change in the absence of uranous compounds.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4418 ACS Reagent Chemicals, Part 4
