Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Ammonium 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
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ABSTRACT This monograph for Ammonium 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, Residue after Ignition, Chloride, Nitrite, Phosphate, Sulfate, Heavy Metals, and Iron.
NH4NO3
Formula Wt 80.04
CAS No. 6484-52-2
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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hygroscopic solid freezing mixtures melting point, 169 °C 190 g in 100 mL at 20 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥95.0% NH4NO3 pH of a 5% solution at 25.0 °C . . . . . . . . . . . . 4.5–6.0 Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.005% Residue after ignition. . . . . . . . . . . . . . . . . . 0.01% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 5 ppm Nitrite (NO2) . . . . . . . . . . . . . . . . . . . . . . . Passes test Phosphate (PO4) . . . . . . . . . . . . . . . . . . . . . 5 ppm Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.002% Heavy metals (as Pb) . . . . . . . . . . . . . . . . . . 5 ppm Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ppm
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4029 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By alkalimetry for ammonium). Weigh, to the nearest 0.1 mg, 3.0 g of sample, and dissolve in 50 mL of water in a 500 mL Erlenmeyer flask. Add exactly 50.0 mL of 1 N sodium hydroxide volumetric solution, place a filter funnel loosely in the neck of the flask, and boil until all the ammonia is expelled (about 10–15 min) as determined with litmus paper. Cool, and add 0.15 mL of thymol blue indicator solution. Titrate the excess sodium hydroxide with 1 N sulfuric acid. One milliliter of 1 N sodium hydroxide corresponds to 0.08004 g of NH4NO3.
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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 20 g dissolved in 200 mL of water.
Residue after Ignition [Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 10 g.
Chloride [Part 2: Colorimetry and Turbidimetry; Chloride]. Use 2.0 g.
Nitrite [Part 2: Direct Electrometric Methods; Specific Polarographic Procedures; Polarographic Procedure for Nitrate]. Dissolve 0.150 g of sodium nitrite in water, and dilute with water to 100 mL. Dilute 1.0 mL of this solution with water to 100 mL. This solution should be freshly prepared. Use 1.0 g of sample and 0.005 mg of nitrite. (Limit about 5 ppm.)
Phosphate [Part 2: Colorimetry and Turbidimetry; Phosphate; Procedure for Phosphate, Method 1 (Direct Molybdenum Blue)]. Dissolve 4.0 g in 25 mL of approximately 0.5 N sulfuric acid.
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For the Determination of Sulfate, Heavy Metals, and Iron
S a m p l e S o l u t i o n A . Dissolve 20 g in 20 mL of water, add 10 mg of sodium carbonate, 5 mL of 30% hydrogen peroxide, 20 mL of hydrochloric acid, and 20 mL of nitric acid. B l a n k S o l u t i o n B . Prepare a solution containing the quantities of reagents used in sample solution A. Digest each in covered beakers on a hot plate (~100 °C) until reaction ceases, uncover, and evaporate to dryness. Dissolve the residues in 5 mL of 1 N acetic acid and 50 mL of water, filter if necessary, and dilute to 100 mL with water (1 mL = 0.2 g).
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4029 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
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Sulfate
[Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Use 12.5 mL of sample solution A (2.5 g sample). Use 12.5 mL of blank solution B to prepare the standard solution.
Heavy Metals† [Part 2: Colorimetry and Turbidimetry; Heavy Metals (as Lead); Procedure for Heavy Metals, Method 1]. Dilute 20 mL of sample solution A (4 g sample) with water to 25 mL. Use 20 mL of blank solution B to prepare the standard solution.
Iron†
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[Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. Use 25 mL of sample solution A (5 g sample). Prepare the standard solution with 25 mL of blank solution B.
© 2017 American Chemical Society
C
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4029 ACS Reagent Chemicals, Part 4
