Which surfactant is the best to prevent precipitation of dissolved silver in alkaline digestion with TMAH?

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Alan F Rawle

Ana Cristina Giménez Ingalaturre

A surfactant won’t help you. You need a change of pH in order to keep the Ag soluble. Examine the Pourbaix diagram for the appropriate range. Or use aqueous ammonia to keep the silver in alkaline solution as the diammine complex.

Yuri Mirgorod

Air oxygen is retained in water and in solutions. Pre-heat the TMAH solution to remove oxygen before dissolving Ag, and then dissolve Ag during heating, if possible, in an induction furnace.

There's a Pourbaix diagram for Ag and water in a document that can be downloaded from RG. See Figure 4 in the attached.