Parameter calculation and calibration

After the deconvolution step, giving the contribution coefficients of reference spectra (see Chapter 2), the parameters calculation is possible by using the same coefficients and a corresponding calibration file (Fig. 11). This calibration file includes the corresponding concentrations for specific compounds (nitrate, nitrite, anionic surfactants, etc.) and the values related to the reference spectra of mixtures (Table 3). The latter are statistically calculated for the purpose, through a preliminary stepwise regression study, from a set of at least 30 samples (with 30 corresponding values of parameters and 30 sets of contribution coefficients). 

For each basis of reference spectra, the choice of which is guided either by the knowledge of the sample origin, or the restitution error value, a corresponding calibration file 

Several validation experiments have been carried out for water and wastewater quality monitoring. Tables 4 and 5 present the general conditions and the results of UV estimation of aggregated organic parameters. 

The study of numerical results related to the regression study for each aggregated parameter comparison is not sufficient. On one hand, the distribution of the results must be carefully checked, for example, with the study of the residuals variation (Fig. 13), corresponding to a residual standard deviation (RSD) of 20%. In this case, no particular 

Parameter (unit) Reference method Samples Number Observation 

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