On Gold(I) Complexes and Anodic Gold Dissolution in Sulfite-Thiourea Solutions

被引：12
|
作者：
Mironov, Igor V. [1 ,2 ]
Kal'nyi, Danila B. [1 ,2 ]
Kokovkin, Vasiliy V. [1 ,2 ]
机构：
[1] RAS, Siberian Branch, Nikolaev Inst Inorgan Chem, Lavrentjev Ave 3, Novosibirsk, Russia
[2] Novosibirsk State Univ, Pirogova Str 2, Novosibirsk, Russia
来源：
JOURNAL OF SOLUTION CHEMISTRY | 2017年 / 46卷 / 04期
关键词：
Gold; Thiourea; Thiocarbamide; Sulfite; Anodic dissolution; Complexes of gold(I); FORMAMIDINE DISULFIDE; THIOCARBAMIDE; OXIDATION; REDUCTION; ELECTROOXIDATION; THIOSULFATE; MECHANISM; BEHAVIOR; KINETICS; AU(111);
D O I：
10.1007/s10953-017-0616-9
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Processes involving gold(I) complexes were studied in sulfite-thiourea (TU) solutions. It is shown that at pH > 5 the complex [] undergoes irreversible decomposition followed by deprotonation and formation of a solid phase. From the data of pH in mixed solutions, the equilibrium constants were evaluated: , log(10) beta (1) = -1.2, log(10) beta (2) = -3.6. Some aspects of the anodic dissolution of gold in mixed sulfite-thiourea solutions are considered. With the help of the carbonate buffer system the change of the anodic current density j (a) was studied at high pH; j (a) (pH) has a maximum at pH 11.6-11.9 for E (a) = 0.3-0.6 V (vs. NHE). At pH > 12.0, the j (a) values decrease sharply. Possible mechanisms of anodic gold dissolution, as well as the role of sulfite, are discussed.
引用
收藏
页码：989 / 1003
页数：15
相关论文
共 50 条
12345