Fourier-transform infrared spectroscopic studies on the interaction among marine trace metal ions,solid particles and organics

IR spectra of Cu (II)-marine solid particle systems show that Cu(II)-marine solid particle ion exchange causes a stepwise change in the surface H-bonding hydroxyl groups on illite, montmorillonite, CaCO₃, γ-AlOOH and goethite, but that this does not affect the surface free hydroxyl groups on illite, montmorillonite and CaCO₃, and framework hydroxyl group on goethite and on γ-AlOOH. Over the range of Cu (II) exchange amounts in the present experiment, four stepwise changes were discovered for the surface H-bonding hydroxyl group on illite, while two stepwise changes were observed on the other marine solids. The interfacial stepwise ion exchange theory was first demonstrated by the above experimental evidence.