Chemical Analysis of the Alkali Metal Tungsten Bronzes.

Activation analysis with thermal and fission neutrons

“…They can be oxidized with oxygen in the presence of base to tungstates, and in basic solution, they will reduce silver nitrate to silver; however, they are resistant to all acids and water. Some of the bronzes have been analyzed by classical chemical methods (51)(52)(53)(54) The R-6 system accommodates a "rabbit" two inches in diameter. Its irrad iation position is at the edge of and 14 inches below the core, and at 12 2 full power the thermal neutron flux available is 8 x 10 n/cm sec.…”

NONFERROUS METALLURGY. II. Zirconium, Hafnium, Vanadium, Niobium, Tantalum, Chromium, Molybdenum, and Tungsten

“…Cheng (52) studied the factors affecting color formation and the properties of the complexes formed by zirconium and hafnium with xylenol orange and methylthymol blue. It was observed that zirconium formed (268) Lumogallion: Ta, Zr (6) Derivatives of 2,3,7-trihydroxy-6-fluorone: Study of reagents (201) Compounds containing , '-dihydroxyazo: Study of reagents (9) Phosphomolybdic acid: Study of conditions and/or reagents (256) Peroxide: Pyrochlore soils (22) Pyrogallol: Ti, Nb (181)', Ti (179)•, Be, BeO (115)', V (47); minerals and ores (279); complex alloys (110) Methyl violet: Study of reagent (221,222) 1-(2-Pyridylazo)-resorcinol: Nb, Ti, Zr (7) Pyrocatechol Violet : Study of reagents (19) 12-Molybdotantalic acid: Nb, Ti (102) s-Diphenylcarbazide: Study of reactions (178,294); Be (228); U, U oxides (119, 237); W, Mo, V (286); Nb, Ta, W (110); sapphire and ruby (56); diphenyl (190) EDTA, NTA, HEDTA, DCTA, DTPA: Study of absorption spectra (33) EDTA: Ores (25) 1,2-Diaminocyclohexanetetraacetic acid: Ores, refractories (248) Tribenzylamine: Study of conditions and/or interferences (86) Thioglycolic acid: Study of reactions (143) Thiocyanate: Study of interferences (116); W (219); U (119); Cr, W, V (286); steel (92); sea water (281) Diantipyrylmethane-thiocyanate: Steel (264) 8-Quinolinol: Study of conditions and/or interferences (171); U (192); nuclear reactor materials (75) Xylenol orange: U (38) Thioglycolic acid: Study of conditions and/or interferences (143) 8-Quinolinol-5-sulfonic acid: Alkaline earths, Ni, Cd, Al, Th, Mn, Cr (41) 8-Mercaptoquinoline: Study of conditions and/or interferences (170) 1,10-Phenanthroline: Study of conditions and/or interferences (109) 2-Amino-4-chlorobenzenethiolhydrochloride: Steel and cast iron (139) Chloroanilic acid: Study of conditions and/or interferences (158) Diethvldithiocarbamic acid: Study of conditions and/or interferences (103) 1-Mercaptopropionic acid: Study of reagent (42) Solochr...…”

“…Gravimetric methods were used by Raby and Banks (228) for the determination of tungsten in alkali metal tungsten bronzes. In bronzes, except for lithium bronzes, the tungsten was reduced to the metal with hydrogen after the sample was decomposed with bromine trifluoride.…”

Determination of Potassium, Rubidium, and Barium in Their Tungsten Bronzes by Neutron and High Energy Photon Activation.

“…Because the properties of the bronzes vary with composition, it has been necessary to develop techniques for determining the metal to tungsten ratio, commonly known as the a>value. For most bronzes it can be assumed that the ratio of oxygen to tungsten is 3.000 (5,7).…”

“…In these cases attempts to develop relations between composition and lattice parameter have not been successful, and it has been necessary to develop other procedures for analyzing them. Several chemical analyses have been attempted (5,7), but these methods necessitate the destruction of the samples and require considerable time because of the chemical inertness of the tungsten bronzes.…”