Decomposition of dithionite (S2O2-4) was studied by chromatography on an anion exchange column eluted with 20 mM

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Decomposition of dithionite (S2O2-4) was studied by chromatography on an anion exchange column eluted with 20 mM trisodium 1,3,6-naphthalenetrisulfonate in 90 vol% H2O/10 vol% CH3CN with ultraviolet detection at 280 nm. A solution of sodium dithionite stored for 34 days in the absence of air gave five peaks identified as SO2-3, SO2-4, S2O2- 3, S2O2-4, and S2O2-5. All the peaks had a negative absorbance. Explain why.
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