Aluminon

Structural formula
General
Surname	Aluminon
other names	Aurintricarboxylic acid ammonium salt 4,4'-Dihydroxyfuchson-3,3 ', 3' '- tricarboxylic acid ammonium salt
Molecular formula	C 22 H 23 N 3 O 9
Brief description	dark red, crystalline solid
External identifiers / databases
CAS number 569-58-4 EC number 209-319-1 ECHA InfoCard 100.008.473 PubChem 68439 Wikidata Q413703
properties
Molar mass	473.44 g mol −1
Physical state	firmly
Melting point	Decomposition: 220-225 ° C
solubility	800 g l −1 (20 ° C)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319 P: 305 + 351 + 338
Toxicological data	9000 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Aluminon is the ammonium salt of aurintricarboxylic acid and is therefore one of the triphenylmethane dyes . The name of the deep red substance is derived from its use for aluminum detection.

Aluminon (aq).

use

Aluminon is mainly used to detect aluminum. In combination with aluminum in acetic acid solution, it forms a sparingly soluble red colored varnish, which often only turns out to be red flakes after a few minutes. In contrast to that with other metals, the precipitate does not dissolve after the addition of ammoniacal ammonium carbonate solution ((NH ₄ ) ₂ CO ₃ ).

Al ³⁺ + 3 C ₂₂ H ₂₃ N ₃ O ₉ → 3 NH ₄ ⁺ + Al (C ₂₂ H ₁₉ O ₉ ) ₃

Individual evidence

1. ↑ ^{a b c} Datasheet Aluminon at Acros, accessed March 7, 2008.
2. ↑ ^{a b} Data sheet Aurintricarboxylic acid ammonium salt from Sigma-Aldrich , accessed on March 20, 2011 ( PDF ).
3. ↑ Datasheet Aluminon (PDF) from Merck , accessed March 7, 2008.
4. ^ HP Latscha, HA Klein, GW Linti: Analytische Chemie , Springer-Verlag , 2003, ISBN 3-540-40291-8 .