Quantification

4.0 Results and Discussion Before the strontium quantification of the solutions resulted from the ion exchange experiments, it was necessary to investigate what is the range where strontium absorbs radiation linearly and what is the detection limit. The graphs below show the absorbance (atomic absorption) in function of the strontium concentration and it can clearly be seen in figure 2 that at concentrations above 10 ppm the samples start to present non-linear absorption. Therefore, all the strontium quantifications were performed working with concentration below 10 ppm and appropriated dilutions were done when it was necessary. The quantification limit was found to be 0.2 ppm and therefore any concentration below this limit cannot be quantified. Figure 2. Absorbance (atomic absorption) in function of strontium concentration. Before quantifying using atomic absorption, it was also necessary to check if there was any interference that could lead to a wrong reading. It is known that silicon and aluminium can interfere in strontium determination when a air-acetylene flame is being used in the atomization process.…

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