Monograph pubs.acs.org/doi/book/10.1021/acsreagents
8-Quinolinol (8-Hydroxyquinoline; Oxine) 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 8-Quinolinol 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: Melting Point, Suitability for Magnesium Determination, Insoluble in Alcohol, Residue after Ignition, and Sulfate.
C9H7NO
Formula Wt 145.16
CAS No. 148-24-3
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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white solid chelating agent for trace metal analysis melting point, 73–76 °C insoluble
SPECIFICATIONS Melting point . . . . . . . . . . . . . . . . . . . . . . . 72.5–74.0 °C Suitability for magnesium determination . . . . . Passes test Maximum Allowable Insoluble in alcohol . . . . . . . . . . . . . . . . . . . 0.05% Residue after ignition. . . . . . . . . . . . . . . . . . 0.05% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.02%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4315 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Melting Point [Part 2: Measurement of Physical Properties; Melting Point].
Suitability for Magnesium Determination Dissolve 2.5 g in 5 mL of glacial acetic acid, warming if necessary, and dilute with water to 100 mL. Add 3.5 mL of this solution to 50 mL of a solution containing 6 mg of magnesium ion (Mg). Heat to 80 °C, add with stirring 2 mL of ammonium hydroxide, allow to stand for 10 min, and filter. To the filtrate, which should be alkaline and yellow in color, add a solution containing 3 mg of magnesium ion (Mg), and heat to 80 °C. The characteristic yellow magnesium quinolate precipitate should form.
Insoluble in Alcohol Dissolve 3.0 g in 40 mL of alcohol, filter through a tared, preconditioned filtering crucible, wash with 95% ethyl alcohol, and dry at 105 °C.
Residue after Ignition [Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 2.0 g. Use 1 mL of sulfuric acid.
Sulfate Dissolve 2.0 g in 15 mL of methanol and 5 mL of dilute hydrochloric acid (1:3). For control, dissolve 1.0 g in 15 mL of methanol and 5 mL of dilute hydrochloric acid (1:3), and add 0.20 mg of sulfate ion (SO4). Dilute sample and control to 40 mL with water, and add 1 mL of 12% barium chloride reagent solution to each. After 10 min, turbidity of the sample solution should not exceed that of the control solution.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4315 ACS Reagent Chemicals, Part 4
