The introduction of thiourea into initial Palladium (II), Aurum (III) and Platinum (IV) solutes does not affect the sorption processes of these metals on the silica surface with covalently attached <$E gamma>-mercaptopropyl groups. Only <$E 10 sup 4~-~10 sup 6>-multiple mole thiourea excess can lead to the elution of noble metals from the surface of this sorbent. The extraction of Platinum on silica with covalently attached bis-propyldisulfide groups as well could not be improved by the thiourea introduction into the initial noble metal solutes, while Aurum sorption worsens at that, tuhich can be explained by the regularities of complex formation on the solid surface. The investigation of the Pd (II) sorption processes on this sorbent in the presence of various thiourea excesses in the initial solutes led to the conclusion of different Palladium (II) complex stabilities on the surface of the given CMS.

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