Ethylenediaminetetraacetic acid
Ethylenediaminetetraacetic acid, widely abbreviated as EDTA (for other names, see Table), is an aminopolycarboxylic acid and a colourless, water-soluble solid. Its conjugate base is named ethylenediaminetetraacetate. It is widely used to dissolve limescale. Its usefulness arises because of its role as a hexadentate ("six-toothed") ligand and chelating agent, i.e., its ability to "sequester" metal ions such as Ca2+ and Fe3+. After being bound by EDTA, metal ions remain in solution but exhibit diminished reactivity. EDTA is produced as several salts, notably disodium EDTA and calcium disodium EDTA.
It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system.
Uses
Industry
In industry, EDTA is mainly used to sequester metal ions in aqueous solution. In the textile industry, it prevents metal ion impurities from modifying colors of dyed products. In the pulp and paper industry, EDTA inhibits the ability of metal ions, especially Mn2+, from catalyzing the disproportionation of hydrogen peroxide, which is used in "chlorine-free bleaching." In a similar manner, EDTA is added to some food as a preservative or stabilizer to prevent catalytic oxidative decoloration, which is catalyzed by metal ions. In soft drinks containing ascorbic acid and sodium benzoate, EDTA mitigates formation of benzene (a carcinogen).
Podcasts:
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by Eight Dayz
What's So Strange About Me
by: Eight DayzWhere ever I going they’re calling me a stranger they’re
calling me a lier they’re calling me a gypsy.
Take away the children take away the work and savor my
behavior, tell me by my smell.
savor my behavior, tell me by my smell.
What so strange about me I’ll go the same with you just
because I am far away from home you say I don’t belong to
you.
you want me to shine on my culture the things that I
learned you want the total adaption the pride that I
earned.
What remains is the question I’d like to ask you, as soon
as I fit in, who are you gonna bring the bad things to?
They think they have a reason so they’re looking down on
us but the fact they’re only using us as a bad excuse.
Savor our behavior, tell us by our smell.
Savor our behavior, tell us by our smell.
What so strange about me I’ll go the same with you just
because I am far away from home you say I don’t belong to
you.
you want me to shine on my culture the things that I
learned you want the total adaption the pride that I
earned.
What remains is the question I’d like to ask you, as soon