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I was wondering about sulfur as an alternative life-threatening chelators. Why isn't sulfur used as a chelator if heavy metals have an affinity for it?

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    $\begingroup$ 'life-threatening", "safe" - what are you talking about? $\endgroup$ – Mithoron Nov 4 at 19:27
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Sulfur-containing molecules are indeed used in chelation therapy: prime examples are dimercaprol and penicillamine, both of which contain thiol functional groups.

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