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What Is the Definition of Disodium Edta?

What Is the Definition of Disodium Edta? thumbnail
Disodium EDTA is a common preservative in cosmetics.

Disodium EDTA is an organic salt. It is used as a chelating agent; its purpose is to trap metals in solutions. It has applications in food, cosmetics and chemotherapy, but it's also a toxic pollutant.

  1. Formula

    • The empirical formula of disodium EDTA is C10H14N2Na2O8.2H2O. EDTA is an acronym for ethylenediaminetetraacetate.

    Chelation

    • The Latin roots of the word "chelation" mean "claws"; chelating agents are given their name because they bind to metal ions like iron and magnesium.

    Therapy

    • Disodium EDTA is used in chelation therapy to remove heavy metals from the blood. It's used in cases of poisoning from lead, mercury, zinc and cadmium. A patient expels the neutralized metals through the urine.

    Misconceptions

    • Disodium EDTA is believed by alternative medicine enthusiasts to combat cancer and calcium deposits in the bloodstream by binding the body's toxins and excess calcium. The American Cancer Society disputes those claims, writing that its only medicinal use is against heavy metal poisoning.

    Preservative

    • Disodium EDTA's chelation properties make it useful as a food preservative and cleansing agent, and it's used as a preservative in cosmetics for the same reasons.

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References

  • Photo Credit Image by Flickr.com, courtesy of courtney r

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