To avoid losses of diethylene glycol dibutyl ether on extraction and reduction of Au, caused by the solubility of l low in water, 2.6 g/L HO and rising in aq. HCl with the concentration of HCl, toluene and xylene were added to a model solution con(g. Au,9.2. Pt 8.0, Pd 5.0 g/L and 100 g HCl/L. Toluene reduced the loss of the organic phase passing into the raffinate and affected neither extraction nor Au purity. Losses of l were nearly eliminated in aq. < 100 g HCl/L solutions, (max. 3:1) toluene-l as extractant, organic-to-water phase ratio 1:1 to 3:2, stratification time 1 h, and extraction run at room temp.