Determination of molybdenum in silicates through atomic absorption spectrometry using pre-concentration by active carbon
- 1. Brasilia Univ., DF (Brazil). Inst. de Geociencias
- 2. Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. de Quimica
Description
An analytical procedure for molybdenum determination in geological materials through Atomic Absorption Spectrometry, after pre-concentration of the Mo-APDC complex in activated carbon, has been developed, which is needed in order to reduce the dilution effect in the sample decomposition. During the development of this method the influence of pH, the amount of APDC for complexation of Mo and the interference of Fe, Ca, Mn, Al, K, Na, Mg and Ti were tested. It was shown that none of these causes any significant effect on the Mo determination proposed. The results of the analysis at the international geochemical reference samples JB-1 (basalt) and GH (granite) were very accurate and showed that the detection limit in rocks (1,00g) is 0,6 ppm, when using sample dilution of 1 ml and microinjection techniques. (author)
Abstract (Portuguese)
Foi desenvolvido procedimento analitico para determinacao de molibdenio em material geologico por Espectrofotometria de Absorcao Atomica (EAA), apos pre-concentracao do complexo Mo-APDC sobre carvao ativado, como alternativa para reduzir os efeitos das diluicoes necessarias nas decomposicoes de amostras solidas. Foram testadas a influencia do pH e qunatidade de APDC para a complexacao do Mo e as interferencias de Fe, Ca, Mn, Al, Na, Mg e Ti, nao tendo sido observados efeitos significativos para as analises de rochas. Os resultados para as amostras de referencia geoquimica internacionais JB-1 (basalto) e GH (granito) foram precisos e exatos. Em rochas o limite de deteccao foi de 0,6 ppm (1,00g) usando diluicao final para 1ml e tecnica de microinjecao de amostra. (autor)Additional details
Additional titles
- Original title (Portuguese)
- Determinacao de molibdenio em silicatos por espectrofotometria de absorcao atomica usando pre-concentracao sobre carvao ativado
Publishing Information
- Imprint Title
- Proceedings of 2. Brazilian Geochemical Congress
- Imprint Pagination
- 531 p.
- Journal Page Range
- p. 431-435.
- Report number
- INIS-BR--2171
Conference
- Title
- 13. International Geochemical Exploration Symposium. 2. Brazilian Geochemical Congress.
- Dates
- 1-6 Oct 1989.
- Place
- Rio de Janeiro, RJ (Brazil).
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 21074659
- Subject category
- S58: GEOSCIENCES; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ABSORPTION SPECTROSCOPY; MOLYBDENUM; ROCKS
- Descriptors DEC
- ELEMENTS; METALS; SPECTROSCOPY; TRANSITION ELEMENTS
Optional Information
- Notes
- Imprint:Anais do 2. Congresso Brasileiro de Geoquimica.