Thiols oxidation by air is efficiently catalyzed by Cu, which is always present as a contaminant. Metaphosphates and orthophosphate are very good chelating agents killing the catalytic activity of transition metal ions. Metaphosphates are rather quickly hydrolyzed in water producing ortophosphate. Therefore, there is no difference between Metaphosphates and orthphosphate.
Why not to google first?
https://en.wikipedia.org/wiki/Phosphoric_acids_and_phosphates#Metaphosphoric_acids_and_metaphosphates
https://en.wikipedia.org/wiki/Sequestrant
I did Google it and didn't find the difference between metaphosphate and orthophosphate with respect to utility in preventing oxidation. I still don't know if or why one is better than the other.
Thiols oxidation by air is efficiently catalyzed by Cu, which is always present as a contaminant. Metaphosphates and orthophosphate are very good chelating agents killing the catalytic activity of transition metal ions. Metaphosphates are rather quickly hydrolyzed in water producing ortophosphate. Therefore, there is no difference between Metaphosphates and orthphosphate.
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