Silver/ions with inorganic materials

A third type of metal sulfide nanoparticle stabilized by GSH is Ag2S. Ag2S nanoparticle synthesis is challenging particularly in aqueous media due to the tendency to form bulk material rather than discrete nanoparticles. Mehra et al. have developed a standard synthesis for efficient production of this material. In this synthesis, silver ions are reacted with GSH to form a Ag(I)-(GSH) complex (where n is undetermined) and after sufficient reaction time, the inorganic sulfide is added to the solution in stoichiometric amounts to... 

A wide variety of inorganic materials have been used to precipitate or collect trace metals from solution. The most direct approach is a cementation process, which is one that removes the trace pollutants from solution by reduction with a metal and plating onto that metal surface. Although this process may be slow, the filtration is usually quick, since decantation is often sufficient. Finely divided cadmium extracts copper, selenium, and mercury from nitric and sulfuric acid solutions (66). When copper was used to preconcentrate mercury from water or biological fluids prior to atomic absorption analysis, the detection limit was 1-2 X 10 g (67, 68). Iron (69), zinc (70), and tungsten (71), as metals, have also been used to obtain a deposit of several trace metals from aqueous systems as dilute as 10 ppb for subsequent analysis. Elemental tellurium can be produced in solution by reduction using tin(II) chloride or sulfur dioxide, and coprecipitates silver (72) and selenium (73). Granulated silicon-metal alloys were used to remove metal ions from water and brine by reduction as well (74, 75). 

Silver halide electrodes (with properties similar to electrodes of the second kind) are made of AgCl, AgBr and Agl. These electrodes, containing also Ag2S, are used for the determination of Cl-, Br, I and CN ions in various inorganic and biological materials. 

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