Selective determination of Cr(III) ions with novel potentiometric electrodes

Background: Ionophores in the composition of potentiometric ion-selective electrodes interact directly with the analyte ion and enable the determination of ionic species in various samples.Objectives: In this study, a novel ion-selective electrode based on 5-bromosalicylaldehyde thiosemicarbazone was developed for the selective determination of Cr3+ ions.Methods: The optimum electrode composition contained ionophore, poly (vinyl chloride) (PVC), bis (2-ethylhexyl) sebacate (BEHS) and potassium tetrakis (p-chlorophenyl) borate (KTpClPB) in ratios of 4.0: 61.0: 34.0: 1.0 (mg), respectively. Potential measurements were performed using a computer-controlled multi-channel potentiometric measurement system.Results: The developed Cr (III)-selective electrode exhibited a low detection limit of 3.96 x 10(-6) M over a wide concentration range of 1.0 x 10(-5) - 1.0 x 10(-1) M (R-2: 0.9979). The electrode exhibited good selectivity towards Cr3+ ions among metal ions with different charges. The chromium (III)-selective electrode, which exhibited highly reproducible results in three different concentration ranges, also had a very fast response time of 5 s.Conclusions: The developed Cr (III)-selective electrode were successfully performed in various beverage samples. As a result, the proposed electrode can be an alternative to other analytical methods in the analysis of Cr3+ ions.