9465. Tiron

Nomenclature

CAS number: 149-45-1
4,5-Dihydroxy-1,3-benzenedisulfonic acid disodium salt; 1,2-dihydroxybenzene-3,5-disulfonic acid disodium salt; disodium-1,2-dihydroxybenzene-3,5-disulfonate; sodium catechol disulfonate; sodium pyrocatechol-2,4-disulfonate; disodium pyrocatechol-3,5-disulfonate.
C6H4Na2O8S2; mol wt 314.20.
C 22.94%, H 1.28%, Na 14.63%, O 40.74%, S 20.41%.

Description and references

Chelating agent. Prepn: Fukayama et al., JP 52 4327 (1952 to Sanwa Pure Chem.), C.A. 48, 5215c (1954). Use in HPLC determn of iron, titanium, osmium and aluminum: E. Wang, A. Liu, Microchem. J. 43, 191 (1991); in spectrophotometric determn of titanium: S. Honshi et al., Anal. Sci. 13, 863 (1997).

Chemical structure

Properties

Crystals, nonhygroscopic. Very freely sol in water. Produces water-sol, colored compds with metal salts. With ferric chloride the resulting complex yields a deep blue soln at pH below 5. Titanium salts give an orange color, copper salts produce a green-yellow, and hexavalent molybdenum a canary-yellow color.

Use

In determination of trace metals.