Materias
(421)
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documento electrónico
Refineries must not only adapt to evolving environmental regulations for cleaner product specifications and processing, but also find ways to meet the increasing demand for petroleum products,particularly for liquid fuels and petrochemical feeds[...]texto impreso
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2003Internal quality control (IQC), based on the interpretation of results from the analysis of one or more control materials in every analytical run, is an essential part of routine analysis. The interpretation of the results is usually based on t[...]texto impreso
A method has been developed which provides a simple, rapid and accurate spectrophotometric estimation of the vitamin A content in fortified whole milk powder products. Results show at least the same accuracy as those obtained using the more soph[...]texto impreso
DAVIS, HARMER ELMER ; TROXELL, GEORGE EARL ; HAUCK, GEORGE F. W. | Madrid [ESPAÑA] : McGraw-Hill | 1982Experimentation and testing play an importan role in developing new materials and devices and in controlling the quality of materials for use in design and construction. This text is intended for a course that includes laboratory testing of cons[...]texto impreso
THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2005The 2006 revision of the Harmonised Protocol [1] encourages providers of proficiency testing schemes to base their scoring method on fitness for purpose. The resulting z-score relates the deviation of the participant’s score from the assigned va[...]texto impreso
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THOMPSON, MICHAEL | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2002Proficiency testing (PT) is so effective in detecting unexpected problems in analytical work that participation in a scheme (where one is available) is regarded as a prerequisite to accreditation. Moreover, as well as evidence that a laboratory [...]texto impreso
This text discusses the high-resolution NMR of liquid samples and concentrates exclusively on spin-half nuclei (mainly 1 H and 13 C). It is aimed at people who are familiar with the use of routine NMR for structure determination and who wish to [...]texto impreso
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It is the purpose of this paper to explore the possibility of applying the enzyme technique to the analysis of structural polysaccharides (table 1), and to evaluate the use of enzymes in isolation procedures. Although the main structural feature[...]texto impreso
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Article : documento electrónico
SAORI NAKAGOE, Autor ; JOSÉ CHAMORRO OLIVARES, Autor ; LILIÁN GARCÍA, Autor ; FÁTIMA YUBERO, Autor ; MAGNA MONTEIRO, Autor ; LAURA MERELES, Autor ; DIANA DIEZ-PÉREZ-NÚÑEZ, Autor |En Paraguay, la investigación sobre la contaminación por arsénico (As) es aún incipiente. El objetivo del presente estudio fue validar un método analítico para la determinación de arsénico total en muestras de suelo por espectrofotometría de abs[...]texto impreso
TORRE, ALEJANDRA ; LAURA OLAZÁBAL ; TORRES, MARINA ; QUEVEDO, DORIS ; MARCO, VERONICA ; ALCARRAZ, LUCIA ; AMUEDO, VIVIANA | Montevideo [URUGUAY] : Laboratorio Tecnológico del Uruguay (LATU) | 2007Los recursos hídricos existentes en el URUGUAY son muy abundantes, teniendo una muy buena disponibilidad de los mismos en calidad y cantidad. Sus usos son para: abastecimiento humano, riego, Industria, actividad ganadera, turismo termal, esparci[...]texto impreso
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ROYAL SOCIETY OF CHEMISTRY | Cambridge [REINO UNIDO] : Royal Society of Chemistry | AMC Technical Brief | 2001What we should do when results of analytical measurements fall below the detection limit has long been a source of puzzlement. In fact the idea of a detection limit itself is puzzling: why else should we spend so much effort trying to define it [...]