S P E C I F I C A T I O N S

HYDROXY NAPHTHOL BLUE ACS

Synonyms:					1-(2-Naphtholazo-3,6-disulfonic acid)-2-
						naphthol-4-sulfonic Acid, Disodium Salt

CAS No:					165660-27-5

Chemical Formula:				C20H12N2Na2O11S3

Formula Weight:				598.50

Appearance:					Blackish Blue to Dark-blue crystals

Solubility 0.1% (dist. Water):		Clear wine red solution

Loss on drying:				<6%

Absorptivity (1%/1cm(in ammonia
Buffer pH 12.0 + 2 ml 0.05 M.E.T.D.A.)
At Lambda max. 648.0nm:			350 - 500

Suitability for calcium			To Pass Test
determination:

Effective: 01/13/09