Thorin (chemistry)

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Thorin (chemistry)
IUPAC name	Disodium 3-hydroxy-4-[(E)-(2-arsono- phenyl)diazenyl]naphthalene-2,7-disulfonate
Other names	2-(3,6-Disulfo-2-hydroxy-1-naphthylazo)benzenearsonic acid disodium salt, Thoron, Thoronol
Identifiers
CAS number	[3688-92-4]
PubChem	6537679
EINECS number	222-993-1
SMILES	[Na+].[Na+].O[As](O)(=O)c3ccccc3/N=N/c1c2 ccc(cc2cc(c1O)S([O-])(=O)=O)S([O-])(=O)=O
Properties
Molecular formula	C16H11AsN2O10S2
Molar mass	576.30 g/mol
Appearance	Orange-yellow crystals
Melting point	> 300 °C
Solubility in water	Soluble
Hazards
Main hazards	Toxic (T), Dangerous for the environment (N)
NFPA 704	0 3 0
R-phrases	R23/25, R50/53
S-phrases	S20/21, S28, S45, S60, S61
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

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.

[edit] References

Analytical Chemistry, 51, 2293 (1979).

[edit] External links

• MSDS at Oxford University