Date published: 2026-5-2

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Thorin (CAS 3688-92-4)

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Alternate Names:
1-(2-Arsonophenylazo)-2-naphthol-3,6-disulfonic acid disodium salt; Aspan
CAS Number:
3688-92-4
Molecular Weight:
576.30
Molecular Formula:
C16H11AsN2Na2O10S2
Supplemental Information:
This is classified as a Dangerous Good for transport and may be subject to additional shipping charges.
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Thorin is a synthetic compound used as a chromogenic reagent in analytical chemistry. Its ability to form colored complexes with various metal ions makes it especially useful in the photometric detection and quantification of metals in various samples. It can be used as a reagent for the determination of thorium and as an indicator used in the titrimetric determination of organic sulfur compounds and sulfate with Ba(ClO4)2. Thorin is also effective for the analysis of magnesium, which forms a red complex with the reagent, allowing for the sensitive and specific detection of magnesium ions in complex matrices.


Thorin (CAS 3688-92-4) References

  1. Spectrophotometric determination of thorium in standard samples and monazite sands based on the floated complex of thorium with N-hydroxy-N,N'-diphenylbenzamidine and thorin.  |  Nashine, N., et al. 1996. Anal Bioanal Chem. 355: 34-6. PMID: 15045454
  2. Electrophoretic determination of pK-values of indicators and their relation to colour changes.  |  Mori, I., et al. 1972. Talanta. 19: 299-306. PMID: 18961050
  3. A contribution to the use of thorin as an analytical reagent: spectrophotometric study of its complexation with barium and application to sulphate determination in atmospheric particulates.  |  Bruno, P., et al. 1984. Talanta. 31: 479-87. PMID: 18963635
  4. Determination of trace rare earth elements by X-ray fluorescence spectrometry after preconcentration on a new chelating resin loaded with thorin.  |  De Vito, IE., et al. 1999. Talanta. 49: 929-35. PMID: 18967670
  5. Dithiols and monothiols are linked with GABA transport in membrane vesicles of rat brain synaptosomes.  |  Robillard, GT., et al. 1987. FEBS Lett. 224: 391-5. PMID: 3691796
  6. Determination of sulfur trioxide in engine exhaust.  |  Arnold, DR. 1975. Environ Health Perspect. 10: 117-9. PMID: 50930

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Thorin, 1 g

sc-255659
1 g
$73.00

Thorin, 25 g

sc-255659A
25 g
$837.00