3.3. Interference studies and validation of the method
Metal ions can interfere with the measurement by complexing with CQ, and this consumes the ligand or both by complexing and producing reduction peaks that overlap with, or even completely suppress, the Pb–CQ, Cd–CQ or Zn–CQ complexes peak. The first problem was solved by adding excess ligand and using the standard addition method for the determination. Has been reported CQ and oxine forms complex with aluminum, but under our experimental conditions (pH 5.3; CCQ 3.6 μmol L−1; Eads −0.65 V), Al (III) was added until 50.0 μg L−1 and no signal was observed. Similar results were obtained with Co(II) and Ni(II).
3.3. Interference studies and validation of the methodMetal ions can interfere with the measurement by complexing with CQ, and this consumes the ligand or both by complexing and producing reduction peaks that overlap with, or even completely suppress, the Pb–CQ, Cd–CQ or Zn–CQ complexes peak. The first problem was solved by adding excess ligand and using the standard addition method for the determination. Has been reported CQ and oxine forms complex with aluminum, but under our experimental conditions (pH 5.3; CCQ 3.6 μmol L−1; Eads −0.65 V), Al (III) was added until 50.0 μg L−1 and no signal was observed. Similar results were obtained with Co(II) and Ni(II).
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