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            <title xml:lang="en">A multivariate calibration approach for determination of petroleum hydrocarbons in water by means of IR spectroscopy</title>
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                <forename type="first">María Dolores</forename>
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                <title xml:lang="en">A multivariate calibration approach for determination of petroleum hydrocarbons in water by means of IR spectroscopy</title>
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                <term xml:lang="en">Multivariate calibration</term>
                <term xml:lang="en">Infrared spectroscopy</term>
                <term xml:lang="en">Petroleum hydrocarbons</term>
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              <p>The goal of this paper is the development of a multivariate calibration method for the quantitative determination of petroleum hydrocarbons in water and waste water by using FT‐IR spectroscopy and PLS as a regression method to improve the results attained at the present time through the univariate standard method. In order to evaluate the performance of the regression model, four experimental responses obtained from an independent validation set prepared with spiked samples were examined: Root mean square error of prediction (RMSEP), average recovery, standard deviation, and relative standard deviation. In order to compare final results, the univariate model was developed together with the multivariate approach. The results show that the multivariate calibration method outperforms the univariate standard method. The accuracy of the results, capability of detection, and the high index of recovery obtained show that a multivariate calibration approach for the determination of petroleum hydrocarbons in water and waste water by means of IR spectroscopy can be seen as a very promising option to improve the current univariate standard method.</p>
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