Speciation of Potentially Carcinogenic Trace Nickel(II) Ion Levels in Human Saliva: A Sequential Metabolomics-Facilitated High-Field ¹H NMR Investigation by Kayleigh Hunwin, Georgina Page, Mark Edgar, Mohammed Bhogadia, Martin Grootveld

“…The addition of EDTA to Ni(II)-treated WMSS samples successfully reversed these resonance modifications, an observation confirming the transfer of Ni(II) from the above endogenous complexants to this exogenous chelator to form the highly stable diamagnetic octahedral [Ni(II)-EDTA] complex (K_stab = 1.0 × 10¹⁹ M⁻¹). …”
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