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Spectrophotometric catalytic determination of small amounts of rhenium in mineralized rocks and molybdenite

January 1, 1962

Rhenium is determined by spectrophotometry of the tellurium sol formed by the reduction of tellurate by stannous chloride under the catalytic influence of rhenium. A detailed investigation of the conditions for high sensitivity and stability at lowest concentration levels of rhenium is presented as well as the behavior of 26 ions. The method is applied to the determination of some tenths of 1 p.p.m. or more of rhenium in a 1-mg. aliquot of mineralized rocks, mixtures of molybdenite and rocks, and molybdenite concentrates. The practical quantity limit of detection is 2x-10 gram of rhenium. Samples are decomposed with a mixture of CaO, CaCl2, and MgO. On leaching, most constituents of the sample are precipitated either as calcium salts or hydroxides, except for rhenium and a small amount of molybdenum which pass into the filtrate. Residual molybdenum is removed by extraction with 8-quinolinol in chloroform. Better than 95% recoveries are obtained with two fusions with flux.

Publication Year 1962
Title Spectrophotometric catalytic determination of small amounts of rhenium in mineralized rocks and molybdenite
DOI 10.1021/ac60191a003
Authors F. O. Simon, F. S. Grimaldi
Publication Type Article
Publication Subtype Journal Article
Series Title Analytical Chemistry
Index ID 70010793
Record Source USGS Publications Warehouse