By Jose Andrade-Garda, Neil Barnett, Joan Ferré-Baldrich, Alfredo Sanz Medel, Xavier Tomás-Morer, Rosario Pereiro-García, José Costa-Fernández, Lucinio González-Sabaté, Laura Fernández-Ruano, Maria Gómez-Carracedo, Ricard Boqué-Martí, Alatzne Carlosena-Zubie
Content material: an outline of atomic spectrometric options; Classical linear regression by means of the least squares strategy; Implenting a powerful method: experimental designs and optimisation; traditional a number of linear regression and valuable parts regression; Partial least-squares regression; Multivariate regression utilizing synthetic neural networks and help vector mechines; Index
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Additional info for Basic chemometric techniques in atomic spectroscopy
1039/9781849739344-00001 24 Chapter 1 hit the rods. The mass spectrum is scanned by varying the amplitude of the potential and the magnitude of the dc bias applied to the rods, while maintaining a constant ratio between those parameters. QMS are essentially sequential instruments, although they can be used to scan rapidly over 200 m/z in around 1 ms. 5 to 1 atomic mass unit (amu). 13 We should not forget that an appropriate detector, a Faraday cup or an electron multiplier equipped with a conversion dynode, is needed for ion detection.
However, some limitations, such as the degradation in the spectral resolution compared with photomultiplier-based dispersive systems, still remain. ICP-OES has enjoyed long-lasting success, with several companies marketing versatile and robust instruments which are being used for various research and routine applications in many laboratories worldwide. However, there is still a demand for improvement. It is expected that most forthcoming improvements will be related to more eﬃcient data processing to take full beneﬁt of the available emitted information.
Chemical interferences. An important type of chemical interference in atomic spectrometry is due to the presence or formation in the atomiser of analyte refractory compounds. These interferences are probably the most serious ones with comparatively low-temperature atomisers (as ﬂames or graphite furnaces). The reduction of analyte atoms (which become trapped in the refractory molecule) will bring about a decrease of the analytical signal. Typical examples are phosphate interferences in determinations of Ca and Mg by ﬂame-based methods (phosphates can form and they are only partially dissociated at normal ﬂame temperatures).
Basic chemometric techniques in atomic spectroscopy by Jose Andrade-Garda, Neil Barnett, Joan Ferré-Baldrich, Alfredo Sanz Medel, Xavier Tomás-Morer, Rosario Pereiro-García, José Costa-Fernández, Lucinio González-Sabaté, Laura Fernández-Ruano, Maria Gómez-Carracedo, Ricard Boqué-Martí, Alatzne Carlosena-Zubie