ON THE ANODIC DISSOLUTION OF GOLD IN ACIDIC THIOUREA SOLUTIONS

Chinese Journal of Applied Chemistry ›› 1990, Vol. 0 ›› Issue (4): 52-56.

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ON THE ANODIC DISSOLUTION OF GOLD IN ACIDIC THIOUREA SOLUTIONS

Xue Zuolin, Wang Fu, Cheng Fenging

Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Received:1989-07-27 Revised:1989-12-01 Published:1990-08-10 Online:1990-08-10

Abstract

Abstract: By means of linear potential sweep voltammetry and rotating disk electrode, togatherwith coulometric electrolysis, the anodic dissolution of gold in acidic thiourea solutionswere studied. From the experimental results, it is proposed that the anodic dissolution ofgold proceeds according to the following mechanism:Au + TU ⇔ Au(TU)_ads (1)Au(TU)_ads⇔Au(TU)⁺_ads +e (2)Au(TU)⁺_ads + TU→Au(TU)⁺₂ (3)in which (3) is the rate-determining step. The existence of a maximum dissolution ratein the used potential range can be explained by this mechanism.

Key words: gold, thiourea, anodic dissolution

Xue Zuolin, Wang Fu, Cheng Fenging. ON THE ANODIC DISSOLUTION OF GOLD IN ACIDIC THIOUREA SOLUTIONS[J]. Chinese Journal of Applied Chemistry, 1990, 0(4): 52-56.

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ON THE ANODIC DISSOLUTION OF GOLD IN ACIDIC THIOUREA SOLUTIONS

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