In order to either eliminate or minimize matrix
effects and interferences by other metal ions which form complexes
with free 8-HQ, the multiple point standard addition method (n = 3)
was employed to determine the Al concentration in the referred
samples. The results obtained with the proposed AdCSV method using
free 8-HQ for Al determination were compared to those obtained
with the atomic absorption spectrometry method (FAAS) described by
Costa [24] and found to be in agreement (Table 2).