Английская Википедия:Dithiofluorescein
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Dithiofluorescein (sometimes generically called thiofluorescein) is a complexometric indicator used in analytical chemistry. It changes from blue to colorless when it binds to mercury(2+) ions.[1] It thus can indicate the endpoint in the titration of thiols using o-hydroxymercuribenzoic acid[2] or its sodium salt.[3] The reagent can be immobilized t in a polymer on a fiber optic, which might allow development of a detector for sulfide ions in a flow cell.[4] Unlike fluorescein and other related fluoran dyes that have oxygen substituents on the benzene rings, dithiofluorescein, which has sulfur substituents, is not fluorescent.[5]
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