Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Barium Nitrate 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 Barium Nitrate 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, pH of a 5% Solution at 25.0 °C, Insoluble Matter, Chloride, Calcium, Potassium, Sodium, Strontium, Heavy Metals, and Iron.
Ba(NO3)2
Formula Wt 261.34
CAS No. 10022-31-8
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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colorless solid sulfate determination melting point, 592 °C 9.0 g in 100 mL at 20 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% Ba(NO3)2 pH of a 5% solution at 25.0 °C . . . . . . . . . . . . 5.0–8.0 Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.01% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 5 ppm Calcium (Ca) . . . . . . . . . . . . . . . . . . . . . . . 0.05% Potassium (K) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Sodium (Na) . . . . . . . . . . . . . . . . . . . . . . . . 0.005% Strontium (Sr) . . . . . . . . . . . . . . . . . . . . . . 0.1% Heavy metals (by ICP–OES) . . . . . . . . . . . . . . 5 ppm Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ppm
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4049 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By complexometry for barium). Weigh accurately about 1.0 g, transfer to a 400 mL beaker, and dissolve in 100 mL of freshly boiled (carbon dioxide-free) water. Add 100 mL of ethanol, 10 mL of ammonium hydroxide, and 0.3 mL of metalphthaleinscreened indicator solution. Titrate immediately with 0.1 M EDTA volumetric solution to a color change from magenta to gray-green. One milliliter of 0.1 M EDTA corresponds to 0.02614 g of Ba(NO3)2.
pH of a 5% Solution at 25.0 °C [Part 2: Direct Electrometric Methods; pH Potentiometry; pH Range; Procedure for pH of a 5% Solution at 25.0 °C].
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 10 g dissolved in 150 mL of hot water.
Chloride Dissolve 2.0 g in 30 mL of warm water, filter if necessary through a chloride-free filter, and add 0.10 mL of nitric acid and 1 mL of silver nitrate reagent solution. Any turbidity should not exceed that produced by 0.01 mg of chloride ion (Cl) in an equal volume of solution containing the quantities of reagents used in the test.
Calcium, Potassium, Sodium, and Strontium (By flame AAS, [Part 2: Trace and Ultratrace Elemental Analysis; Atomic Absorption Spectroscopy; Analysis; Procedure for Flame AAS]).
For the Determination of Calcium, Potassium, Sodium, and Strontium
S a m p l e S t o c k S o l u t i o n . Dissolve 10.0 g of sample in sufficient water in a beaker, add 5 mL of nitric acid, and transfer to a 100 mL volumetric flask. Dilute to the mark with water (1 mL = 0.10 g). Add 2.0 mL of a 2.5% potassium chloride reagent solution to the flask for calcium and strontium.
For the Determination of Calcium, Potassium, Sodium, and Strontium
Element
Wavelength (nm)
Sample Wt (g)
Standard Added (mg)
Flame Type*
Background Correction
Ca
422.7
0.10
0.05; 0.10
N/A
No
K
766.5
0.40
0.02; 0.04
A/A
No
Na
589.0
0.10
0.005; 0.01
A/A
No
Sr
460.7
0.10
0.10; 0.20
N/A
No
*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4049 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Heavy Metals ([Part 2: Trace and Ultratrace Elemental Analysis; Inductively Coupled Plasma−Optical Emission Spectroscopy (ICP–OES); Calculation of Heavy Metals (by ICP–OES) Results], by ICP–OES). Use 2.0 g sample.
Iron Dissolve 5.0 g in 45 mL of hot water plus 2 mL of hydrochloric acid, and allow to cool. Prepare a standard containing 0.01 mg of iron ion (Fe) in 45 mL of water plus 2 mL of hydrochloric acid. Add 0.10 mL of 0.1 N potassium permanganate volumetric solution to each, allow to stand for 5 min, and add 3 mL of 30% ammonium thiocyanate reagent solution. Any red color in the solution of the sample should not exceed that in the standard.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4049 ACS Reagent Chemicals, Part 4
