Aluminum has a +3 charge. Another method of removing the platinum group elements to an order of magnitude of 15 ppb is described in International Application JP-A-63-502890. The flask was scaled and the mixture was agitated for 5 minutes, after which time the pH of the supernatant or filtrate was measured by the use of a glass electrode. A process for removing heavy metals from a silver nitrate solution comprising the step of: bringing said silver nitrate solution into contact with activated alumina having a surface acidity of at least 8 and an average pore diameter between 15 Å and 50 Å. When did organ music become associated with baseball? Ba(NO3)2 + H2SO4 = BaSo4 + 2HNO3. How long will the footprints on the moon last? In contrast, the use of activated alumina according to the present invention permits effective removal of the elements. 6. This silver nitrate solution was cooled to 60° C. and, thereafter, 1.5 kg of a silver oxide slurry was added to neutralize the nitric acid. 04568) both produced by ICN-BIOMEDICALS GMBH (Germany), and activated alumina 90 (neutral, degree of activity I, Maker Code No. Both suggest that the solubility product of AgCl is of importance in determining why the reaction takes place. A 25 kg portion of the silver nitrate solution as a supernatant was passed at a flow rate of 5 ml/min into an adsorption column comprising a glass tube having a diameter of 1 inch and a length of 100 cm which was packed with 0.35 kg of activated alumina having a particle size of about 1 mm. The process as claimed in claim 1, wherein said surface acidity is between 8 and 12. This passivating layer of aluminum oxide prevents the aluminum metal underneath from reacting with either the water or the silver … ;ASSIGNOR:ANDO, KIKUO;REEL/FRAME:005796/0946, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.);REEL/FRAME:018904/0001, Activated alumina for removing heavy metals and method for producing silver nitrate using the same, Preparation method of high-purity silver nitrate, Active alumina particles for removing harmful ions in water and method for producing the same, Method for removing phosphate ions in water, Method for preparing photographic-grade silver nitrate through one-time crystallization, Separation and recovery method of platinum group material and separation and recovery apparatus therefor, Method of preparing purified silver nitrate, Removal and recovery of silver from waste stream, Process for removal, separation and recovery of heavy metal ions from solutions using activated alumina including acid treated activated alumina, Adsorbents for use in the separation of carbon monoxide and/or unsaturated hydrocarbons from mixed gases, Removal of cupric ion from solution by contact with peanut skins, Pressure swing adsorption method for carbon dioxide adsorption, The removal of heavy metals, especially lead, from aqueous systems containing competing ions utilizing amorphous tin and titanium silicates, Adsorption mass and method for removing carbon monoxide from flows of material, Process for preparing a solid mercury sorbent mass, Catalyst and method for producing said catalyst, Simultaneous removal of mercury and water from fluids, Adsorbent for HCl comprising alumina and acid-treated Y zeolite, An adsorbent for a hydrocarbon stream and process, Sorption and desorption of uranyl ions by silica gel: pH, particle size and porosity effects, Spinel type compound oxide and method of manufacturing the same, Method and Materials for Purifying Hydride Gases, Inert Gases, and Non-Reactive Gases, Catalyst for the synthesis of methanol and alcohol mixtures containing higher alcohols, Adsorbent and substrate products and method of producing same, Selective fluoride and ammonia removal by chromatographic separation of wastewater, Adsorbent for recovery of bromine and bromine-recovering process using same, Hcl adsorbent and method for making and using same, Acid-containing activated carbon for adsorbing mercury from liquid hydrocarbons, Process for theremoval of mercury and of arsenic eventually present from a fluid in presence of a recovery mass for mercury and/or arsenic.