摘要：

Rare earth metals have been extensively used in industry, agriculture, medical and breeding enterprises, which will let the possibilities of rare earth ions entering the animals, plants and human bodies increased. It is necessary to investigate their physiological effects and coordination with living ligands in organisms. In the actual living systems and the application fields of rare earth complexes, not only are the existing forms of the complexes in organisms considered, but also the dissociation rates of them are considered too. In order to investigate the distribution, accumulation and metabolism of rare earth in living things, we have been studied the dissociation kinetics of the complex Yb(Gly-Gly)₂Cl₃·3H₂O in various media of pH at different temperatures based on our previous work. We have drawn the conclusion that the dissociation reaction is first order on the titled complex in pH2.27 with maximum absorption at 209nm, and the dissociation rate was increased with the increasing temperature. The complex wasn't dissociated in the media of pH2.75, 4.00,5.00, 6.00, i.e. the complex is stable in the pH range encountered physiologically (bordering neutrality).

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