The claim that EDTA molecular structure lacks double bonds is incorrect. EDTA contains four carboxylate groups, each of which features a carbon-oxygen double bond.
Ethylenediaminetetraacetic acid (EDTA) contains multiple carboxylate groups, which possess carbon-oxygen double bonds (C=O) as referenced by the OCO stretching modes.
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The analysis
Judged against the evidence record for claims of this kind.