Synonyms:

Thorin I, indicator grade, pure;disodium 1-(2-arsonophenylazo)-2-naphthol-3,6-disulfonate;ThoronⅠ
;Thorin [for Determination of Th, etc.];APANS, Thoron(ol), 1-(2-Arsonophenylazo)-2-naphthol-3,6-disulfonic acid disodium salt, 2-(3,6-Disulfo-2-hydroxy-1-naphthylazo)benzenearsonic acid disodium salt, 2-(2-Hydroxy-3,6-disulfo-1-naphthylazo)phenylarsonic acid disodium salt;1-(o-Arsonophenylazo)-2-hydroxynaphthalene-3,6-disulfonic acid 3,6-disodium salt;4-[(2-Arsonophenyl)azo]-3-hydroxy-2,7-naphthalenedisulfonic acid disodium salt;Thorin Hydrate [for Determination of Th, etc.]

Canonical SMILES: C1=CC=C(C(=C1)NN=C2C3=C(C=C(C=C3)S(=O)(=O)[O-])C=C(C2=O)S(=O)(=O)[O-])[As](=O)(O)O.[Na+].[Na+]

HS Code: 29270000

Melting Point: >300°C

Storage: Storeat+5°Cto+30°C.

PKA: pK1:3.7;pK2:8.3;pK3:11.8(25°C)

Hazard Codes: T,N

Risk Statements:  23/25-50/53

Safety Statements: 20/21-28-45-60-61

Transport: UN 3465 6.1/PG 3

WGK Germany: 3

HazardClass: 6.1(a)