Substoichiometric determination of manganese by neutron-activation analysis

Principles and Applications of Substoichiometric Techniques of Analysis

“…The TPA and TPP cations appear to be suitable for substoichiometric determinations of manganese (as MnO 4 "), rhenium (as ReC>4 ~), and perhaps chromium(VI), by neutronactivation analysis. Manganese has in fact been determined, 14 in the absence of gold and rhenium, by extraction with a substoichiometric amount of tetraphenylarsonium chloride into chloroform. In the presence of gold, however, a preliminary separation of manganese with diethyldithiocarbamate into chloroform was necessary.…”

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

“…Description of technique (133); A1 (382); B (392); Cr (165); Ti (462, 463); Re, Pt (563); W (633); Ge02 (32); V205 (11,195), rock (112), chalk, CaC03, KOH (701); soil extracts (710); blood (475) Tungsten Description of technique (133); A1 (382); Cr (165); Ti (462,483); Ni (44); Si (74); Mo (177,383); Nb (391); Pb (194); TI (208); Se (35,207); Re, Pt (563); B (392, 393); BN (552); V2Os (195); rocks, minerals (196); water (5,6) molybdenum on -benzoinoxime and elution with ammonium hydroxide (328). Other applications involving the use of thiocyanate as the chromogenic reagent include the determination of molybdenum in perrhenates (570), electric welding aerosols (346), vanadium (27), ores and concentrates (352), oil shale (656), soil extracts (317), and soils and rocks (268).…”

“…A solution of bis(2-ethylhexyl)phosphate in either heptane or petroleum ether was used to extract molybdenum in a procedure for the determination of molybdenum in steels and molybdenum-tungsten alloys (633). A study was made of the substoichiometric extraction of molybdenum using the tetraphenylarsonium molybdate or analogous sulfur or phosphorous compounds as the extractable species (701). Cupferron and 8-hydroxyquinoline dissolved in chloroform were compared as extractants for the separation of molybdenum by substoichiometric extraction in a neutron activation analysis method for the determination of molybdenum in germanium oxide (32).…”