- Synonyms: Ammonium purpurate, acidr- C8H8N6O6r- M = 284,19 g/molr- CAS [3051-09-0]r- EINECS-No.: 221-266-6r- Solub. in water: (20 ºC): ~ 1 g/lr- Tariff number: 2933 54 00 00r- Applications: analytical chemistry, indicator (for determination of: metals), complexant agent.rrSPECIFICATIONSrAbsorption maximum l (in H2O): 517 - 523 nm rAbsorptivity (A1%/1 cm; l max.): 375 - 500 rrloss on drying : max. 10 %r