Gold oxygen containing

Gold(III) is usually separated from Pt and Pd by extraction from 4-8 M hydrochloric acid [18-20] or from H2S04-KBr media [21]. Oxygen-containing solvents, such as DIPE, MIBK, mesityl oxide, or amyl acetate have been used as extractants. Iron(III), which interferes, is masked with phosphoric acid before the extraction of gold. The chloride complex of gold can also be extracted with TOPO in MIBK [20], TBP in toluene or xylene [24]. The anionic... 

At low concentrations of hydroxide ions (10-6-10-4 mol kg-1), the slope of the E-pO plot for the gold oxygen electrode is equal to 1. 15RT/F. The authors consider that the stabilization of oxide ions in the nitrate melts is caused by the presence of traces of water and silica, and that the latter dissolves in the melt owing to the interaction of the nitrate melt with the Pyrex glass from which the container for the melt is made. This means that the stabilization of oxide ions is nothing but the formation in the melt of silicate and hydroxide ions. If such a stabilization is absent in solutions, then oxide ions are oxidized by... 

The situation is more difficult when the anodic oxidation of organic fuels is desired. Oxygen containing fuels (for instance CO, CH3OH) can be oxidized on metals of group Ib of the periodic table such as gold and silver, mixed oxides, and spinels. However, the efficiency is the best for platinum and platinum alloys. For the direct oxidation of hydrocarbons, only platinum has proved useful [6] in low-temperature cells so far. 

Experimental values for tire sputtering efficiency tend to show lower values of a for elements, such as aluminium and mngsten which form stable oxides, compared with the metals such as gold and platinum which do not under normal experimental conditions. This is probably due to the presence of a surface oxide, since industrial sources of argon, which are used as a source of ions for example, usually contain at least 1 ppm of oxygen, which is more than enough to oxidize aluminium and tungsten. 

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