Reactive oxygen species in the aerobic decomposition of sodium hydroxymethanesulfinate.
Sodium hydroxymethanesulfinate, (HOCH2SO2Na, HMS) is relatively stable in aqueous alkaline environments, but rapidly decomposes in acidic medium to give a variety of products that include sulfur dioxide. A detailed kinetic and mechanistic study of the decomposition of HMS in slightly acidic medium has shown a process that produces dithionite, S2O2-4, which is preceded by an induction period which persists for as long as molecular oxygen is present in the reaction solution. The complete consumption of molecular oxygen is a prerequisite for the formation of S2O2-4. Among some of the intermediates detected in the decomposition of HMS is the sulfite radical, SO-3. Comparisons are made between the decomposition mechanisms of thiourea dioxide (aminoiminomethanesulfinic acid) and HMS.
Makarov
S V
SV
Department of Physical Chemistry, Academy of Chemistry and Technology, Engels Street 7, Ivanovo, 153460, Russia.
Mundoma
C
C
Svarovsky
S A
SA
Shi
X
X
Gannett
P M
PM
Simoyi
R H
RH
D002374:Catalase / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005561:Formates / Q000494:pharmacology; D008956:Models, Chemical; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013431:Sulfates / Q000494:pharmacology; D013441:Sulfinic Acids / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000494:pharmacology; D013997:Time Factors
D005561:Formates; D017382:Reactive Oxygen Species; D013431:Sulfates; D013441:Sulfinic Acids; C030544:formic acid; C012036:sodium sulfate; C011111:formaldehydesulfoxylate; D002374:Catalase; D013482:Superoxide Dismutase