this solvent on the fluorescence intensity was also studied.
Using ethanol up to 12% (v/v) has not a significant effect on the
fluorescence but at higher percentages the intensity was lower.
Since the ethanol content of calibration solutions does not
exceed 1%, therefore there is no need for adjusting its concentration.
3.3. Accuracy
In order to check the accuracy of the proposed method,
recovery experiments on various samples spiked with different
amounts of tin were carried out (Table 1). As can be seen,
the obtained recoveries are between 95.2 and 102.8%, which
confirm the accuracy of the method