The nature of nickel complexes in various Ni accumulating plant species, mainly from New
Caledonia, was investigated by techniques including gel chromatography, ion-exchange
chromatography, high performance liquid chromatography, and a combination of gas-liquid
chromatography and mass spectrometry. Psychotria douarrei contained Ni complexed
mainly (63%) as a negatively-charged malate complex balanced by a cationic aquo
complex. Phyllanthus serpentinus had anionic Ni bound as 42% citrate and 4O% malate. All …