Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Aurin Tricarboxylic Acid, [tri]Ammonium Salt (5-[(3-Carboxy-4-hydroxyphenyl)(3-carboxy-4-oxo-2,5-cyclohexadien-1ylidene)methyl]-2-hydroxybenzoic Acid, Triammonium Salt; Aluminon) 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 Aurin Tricarboxylic Acid, [tri]Ammonium Salt provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Sensitivity to Aluminum, Insoluble Matter, and Residue after Ignition.
(HOC6H3COONH4)2C:C6H3(COONH4):O
Formula Wt 473.44
CAS No. 569-58-4
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . yellowish-brown or brownish-red solid Applications . . . . . . . . . . . . . . . . . . . . . . . . detection and colorimetric estimation of aluminum in water, tissues, and foods Aqueous solubility . . . . . . . . . . . . . . . . . . . . freely soluble
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4043 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
SPECIFICATIONS Sensitivity to aluminum . . . . . . . . . . . . . . . . Passes test Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.1% Residue after ignition. . . . . . . . . . . . . . . . . . 0.2%
TESTS Sensitivity to Aluminum Dissolve 25 mg in 20 mL of water and 0.1 mL of dilute ammonium hydroxide (10% NH3). Add 0.1 mL of this solution and 0.1 mL of acetic acid to 10 mL of a solution containing 0.001 mg of aluminum ion (Al). A distinct pink color should appear within 15 min.
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 1.0 g dissolved in 100 mL of water plus 0.5 mL of dilute ammonium hydroxide (10% NH3).
Residue after Ignition [Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 0.50 g.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4043 ACS Reagent Chemicals, Part 4
