Hi! It is very common to use the disodium salt of EDTA, so It is very probable that when you see someone is using EDTA, they are refering to this type of salt an not others. Hope it is useful!!

julio

Dear Victoria Williams,

Really, EDTA has no reductant properties and can’t work as direct antioxidant. However, it is commonly used for preventing oxidation/autooxidation due to its ability to bind the ions of transition and heavy metals, which accelerate the radical oxidation (like a Fenton-type), even in trace quantities.

For details see useful discussion https://www.researchgate.net/post/How_do_you_avoid_GSH_air_oxidation_in_your_sample_preparations

Thank you both. this is very helpful.