Zobrazeno 1 - 7
of 7
pro vyhledávání: '"J. J. La Brecque"'
Publikováno v:
Applied Spectroscopy. 32:57-60
An interference-free atomic absorption method for the determination of total iron in geological samples has been adopted. The method is based on the conventional standard curve technique employing the 386 nm atomic absorption line in the fluoboric-bo
Autor:
J. J. La Brecque
Publikováno v:
Chemical Geology. 26:321-329
For the determination of alumina and silica in Venezuelan laterites by atomic absorption spectroscopy, the inter-element (chemical) interferences by the major common elements are eliminated by the fluoboric—boric acid matrix. The HF 3 H 3 BO 3 m
Autor:
J. J. La Brecque
Publikováno v:
Journal of Radioanalytical Chemistry. 43:253-262
A rapid method for the determination of titanium in geochemical samples using a55Fe radioisotope as the extraction source coupled to a Si(Li) detector and a PDP-11.05 computer is described. The relative standard deviation for a thin sample about 100
Autor:
J. J. La Brecque
Publikováno v:
Applied Spectroscopy. 33:389-393
A method to overcome the numerous interferences present for the determination of titanium in Venezuelan laterites and bauxites has been adopted. The technique is based on dissolving the sample in the HF-H3BO3 matrix. The advantages of using this syst
Autor:
J J, La Brecque
Publikováno v:
Acta cientifica venezolana. 29(6)
Autor:
P A Rosales, J. J. La Brecque
Publikováno v:
Talanta. 26(11)
A technique is presented for determination of FeS(2) in Venezuelan laterites after a sulphurization process. The determination is based on a reaction with water followed by a turbidimetric determination of sulphate ions in solution. The effect of the
Autor:
J. J. La Brecque, I.L. Preiss
Publikováno v:
Journal of Inorganic and Nuclear Chemistry. 38:2139-2140
The peak of the excitation functions for the production of68,69,70,71Se and68,69,70,71As using heavy ion reactions is given based on the relative amounts of either the isotope of interest or its respective long-lived granddaughter. In all experiments