Thorin (chemistry)

Thorin (chemistry)

Chembox new
ImageFile = Thorin.png ImageSize = 240px
IUPACName = Disodium 3-hydroxy-4- [(E)-(2-arsono- phenyl)diazenyl] naphthalene-2,7-disulfonate
OtherNames = 2-(3,6-Disulfo-2-hydroxy-1-naphthylazo)benzenearsonic acid disodium salt, Thoron, Thoronol
Section1 = Chembox Identifiers
CASNo = 3688-92-4
EINECS = 222-993-1
PubChem = 6537679
SMILES = [Na+] . [Na+] .O [As] (O)(=O)c3ccccc3/N=N/c1c2 ccc(cc2cc(c1O)S( [O-] )(=O)=O)S( [O-] )(=O)=O

Section2 = Chembox Properties
Formula = C16H11AsN2O10S2
MolarMass = 576.30 g/mol
Appearance = Orange-yellow crystals
Density =
MeltingPt = > 300 °C
BoilingPt =
Solubility = Soluble

Section3 = Chembox Hazards
MainHazards = Toxic (T), Dangerous for the environment (N)
RPhrases = R23/25, R50/53
SPhrases = S20/21, S28, S45, S60, S61
NFPA-H = 3
NFPA-F = 0
NFPA-R = 0
FlashPt =
Autoignition =

Thorin (also called Thoron or Thoronol) is an indicator used in the determination of barium, beryllium, lithium, uranium and thorium compounds. Being a compound of arsenic, it is highly toxic.


"Analytical Chemistry", 51, 2293 (1979).

External links

* [ MSDS at Oxford University]

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