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J. Braz. Chem. Soc. vol.26 número1

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Academic year: 2018

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Table 1. Experimental matrix of Doehlert design for optimizing the  SPE method
Table 2. Responses (absorbance) from the application of Doehlert design  in the preconcentration of Cd
Figure 2. Graphical display of observed values vs. predicted values for  the quadratic function on the absorbance data generated from the system  of Cd preconcentration.
Figure 3. Two response surfaces generated by fitting the quadratic model to the data obtained from Cd absorbance.
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