Highly selective determination of perchlorate by a novel potentiometric sensor based on a synthesized complex of copper

In this paper, a highly selective poly (vinyl chloride) (PVC) membrane electrode based on (1, 9-dibenzyl-1, 3, 7, 9, 11, 15-hexaaza cyclohexa decane) copper(II) perchlorate; [Cu((benzyl)2[16]aneN6)](ClO4)2; as a synthesized ionophore, for perchlorate-selective electrode is reported. The influence of membrane composition, pH and possible interfering anions were investigated on the response properties of the electrode. The sensor responds to perchlorate ion in linear range from 1.0 × 10− 6 to 1.0 × 10− 1 M with a slope − 59.4 ± 0.3 mV per decade. The limit of detection of the electrode was 4.0 × 10− 7 M ClO4–. Selectivity coefficients indicate a good discriminating ability towards ClO4– ion in comparison to other anions. The proposed sensor has a fast response time of about 7 s and can be used for at least 2 months without any considerable divergence in potential. Due to importance of analysis of perchlorate in water samples, this selective electrode was applied as potentiometric sensor in determination of perchlorate ion in real samples.

► A novel complex of copper (II) was synthesized. ► This complex was used as a selective ionophore in perchlorate potentiometric sensor. ► Linear range of sensor was 1.0 × 10− 1 to 1.0 × 10− 6 M with slope of − 59.4 mV/decade. ► Detection limit and response time was 4.0 × 10− 7 M and 7 s, respectively. ► This sensor was applied in determination of perchlorate ion in some real samples.