Molybdenum In Rocks Research Articles

Determination of molybdenum in rocks by atomic absorption spectrometry with electrothermal atomization after its separation with α-benzoinoxime

A method has been worked out for a sensitive and accurate determination of molybdenum in rocks in contents of the order of 10-1 g/t. The sample is decomposed with acids and molybdenum is separated from practically all other elements by extraction with α-benzoinoxime from solution of 1.5 M hydrochloric acid and 0.13 M tartaric acid into chloroform, and determined in the extract by AAS with electrothermal atomization. The quantitativeness of the extraction has been examined and the optimum conditions for the determination in a graphite furnace have been established. The effects of chloroform and of the graphite atomizer on the signal of molybdenum have been investigated, and the accuracy of the method has been tested on GXR geochemical standards.

Spectrophotometric determination of molybdenum in rocks with thiocyanate

A rapid procedure for the determination of microgram amounts of molybdenum in rocks is described. After acid decomposition, molybdenum is extracted from a hydrochloric acid solution into xylene with tributyl phosphate. After back-extraction with water, molybdenum is extracted as the α-benzoinoximate into chloroform, stripped into hydrochloric acid extracted as the thiocyanate into amyl alcohol, and determined spectrophotometrically. The molybdenum thiocyanate color produced is stable, sensitive, and reproducible. Results of analyses of several of the U.S. Geological Survey standard rocks are given.

Determination of molybdenum in rocks by epithermal neutron activation analysis

A neutron-activation method for molybdenum in rocks based on epithermal activation and a simple radiochemical separation is described, and data for some standard rocks are presented. Errors caused by fission of uranium and thorium in neutron activation for molybdenum are calculated and discussed. The interference from fission product 99Mo is shown to be considerably dependent on the epithermal and the fast-neutron flux. Epi-cadmium activation reduces the uranium interference by a factor of 20–80 compared to activation without cadmium cover, the actual value being dependent on the cadmium ratio of gold in the irradiation position used.

Polarographic Determination of Molybdenum in Rocks and Ores.

Polarographic Determination of Molybdenum in Rocks and Ores.

The occurrence of molybdenum in rocks with special reference to those of Hawaii

The occurrence of molybdenum in rocks with special reference to those of Hawaii

Distribution and quantitative occurrence of vanadium and molybdenum in rocks of the United States

Distribution and quantitative occurrence of vanadium and molybdenum in rocks of the United States