Spektralphotometrische Bestimmung von Niob in Platin-Niob-Legierungen

Nonferrous metallurgy. II. Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

“…The niobium in heat-resistant alloys which contained large percentages of copper was determined using acid chrome violet K (151). Pyrogallol was used as the reagent for the determination of niobium in alloys with platinum (200). A number of ternary complexes containing niobium, a polyphenol such as pyrocatechol or pyrogallol, and an amino polycarboxylic acid such as EDTA, were investigated for suitability for the spectrophotometric determination of niobium (9).…”

“…4-(2-Pyridylazo)resorcinol: Zr, Ti (680); rocks (223); U (667) Sulfochlorophenol S: study of reactions (555); U, W (173); rocks and minerals (72) Sulfonitrophenol M: study of conditions (557) H202: Pb, Bi (645) H202-l-(2-pyridylazo)-2-naphthol: study of conditions (344) CNS: study of conditions ( 150) CNS-V-benzoyl-V-phenylhydroxylamine: fissium (664) V-Cinnamoyl-A'-phenylhydroxylamine: study of conditions (166) Acid Chrome Violet K: heat-resistant alloys (151) Pyrogallol: Pt (200) Dibromogallic acid: study of reagents (8) Polyphenols and aminopolycarboxylic acids: study of reagents (9) Catechol and tertiary amine: study of extraction (488) Pyrocatechol and tribenzylamine: study of conditions H202-thiosulfate: study of conditions (389) Dibromogallic acid: study of reagents (8) Pyrocatechol: alkali tantalates (596) Pyrogallol: study of conditions (551) Phenylfluorone: Li, K (65) Butyl Rhodamine: Nb (696) Nile Blue A: steel, Nb (192) Meldola's Blue: Nb (502) Victoria Blue B: study of conditions (329) Malachite Green: Nb (230) Methyl Green: study of conditions (628) Crystal Violet: Nb (360); study of conditions (107) s-Diphenylcarbazide: study of solvent extraction (145, 580, 684); plating baths (455); silicates (339); rocks and minerals (188); water (64); wood (144,678); ash (178); organic substances (297); shellfish (454) Cr(III): ruby (233)…”