Published 1985
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Spectrographic analysis of metallic silicium and natural quartz
Description
A method has been developed for the spectrographic determination of B, Mg, Al, Ca, Ti, Mn, Fe, Ni, Cu and Ag in silicon metal and other for Al, Ca, Mg, Ti, Cr, Mn, and Fe in natural quartz. A mixture of the matrix with a proper buffer is excited directly in a dc-arc. High-current (25A) and argon atmosphere are used for both the methods. Silicon metal is blended with 8% NaF and after 1:1 (w/w) with graphite. For natural quartz 20% NaF and 30% graphite by weight is the buffer mixture employed. The lower values in the determinations varies from 0.5 to 40 μg/g and the precision of the analysis from 7% to 45%. (Author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Apresenta-se um metodo espectrografico para a determinacao de B, Mg, Al, P, Ca, Ti, Mn, Fe, Ni, Cu e Ag em silicio metalico e um outro para a determinacao de Al, Ca, Mg, Ti, Cr, Mn e Fe, na forma de seus oxidos, em quartzo natural. Para ambos, emprega-se a excitacao direta da matriz com uma mistura tampao, em atmosfera de argonio e arco de corrente continua de 25A. Para a analise de silicio metalico adiciona-se a matrix 8% de NaF e mistura-se com grafita na proporcao de 1:1 (m/m). Para a analise de quartzo natural adiciona-se a matriz 20% de NaF e 30% de grafita. Os limites de determinacao sao da ordem de 0,5 - 40 μg/g. O desvio padrao relativo situa-se numa faixa de 7% a 45%. (Autor)Files
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Additional details
Additional titles
- Original title (Portuguese)
- Analise espectrografica de silicio metalico e quartzo natural
Publishing Information
- Imprint Pagination
- 17 p.
- Report number
- IPEN-PUB--76
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 17018598
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- ACCURACY; CALIBRATION STANDARDS; EMISSION SPECTROSCOPY; INTERFERING ELEMENTS; QUANTITATIVE CHEMICAL ANALYSIS; QUARTZ; SILICON
- Descriptors DEC
- CHEMICAL ANALYSIS; ELEMENTS; MINERALS; OXIDE MINERALS; SEMIMETALS; SPECTROSCOPY