I am looking for a way to stabilize sulfite in biological fluids (plasma and urine) without the use of formaldehyde.

12 December 2012 1 4K Report

Does anybody have suggestions to avoid the oxidation of sulfite to sulfate?

May I refer you to the following reference:

Stabilization of sulfide and sulfite and ion-pair chromatography of mixtures of sulfide, sulfite, sulfate and thiosulfate.

Miura Y, Matsushita Y, Haddad PR.

J Chromatogr A. 2005 Aug 26;1085(1):47-53.

PMID: 16106847 [PubMed - indexed for MEDLINE]

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