Exploitation of o-benzoyl benzoic acid as an efficient electroactive material for selective determination of Cr (III) ions in pharmaceutical samples and industrial waste water using carbon sensor

• Published in: Analytica chimica acta 2021-04, Vol.1154, p.338322-338322, Article 338322
• Main Authors: Frag, Eman Yossri, Mohamed, Nourhan Mahmoud, Elashery, Sally E.A.
• Format: Article
• Language: English
• Subjects: Benzoic Acid; Carbon; Carbon paste electrode; Cr (III) ion; Energy dispersive X-ray analyzer; Hydrogen-Ion Concentration; Industrial Waste; Industrial waste water and pharmaceutical forms; o-benzoyl benzoic acid; Pharmaceutical Preparations; Scanning electron microscope; Waste Water; Water
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2021.338322

Herein, for the first time, o-benzoyl benzoic acid has been explored as a promising electroactive material for the fabrication of sensitive, precise and accurate carbon paste electrode (CPE) for selective detection of Cr (III) ion. o-benzoyl benzoic acid (o-BBA) as a sensing material and tricresylphosphate (TCP) as a solvent mediator improved the developed sensor performance to get the Nernstian cationic slope of 20.03 ± 0.11 mV decade−1 within the concentration range of 5.0 × 10−7-1.0 × 10−1 mol L−1. The sensor displayed a fast response time of 12 s reflecting a pH independency over the pH range of 3.1–4.7. Moreover, the reaction between the sensing material and Cr (III) ion on the developed sensor surface was elucidated using the microscopic technique such as scanning electron microscope (SEM) in addition to the energy dispersive X-ray analyzer (EDX). The proposed sensor showed an adequate shelf lifetime (∼33 days). The values of potentiometric selectivity coefficient were obtained by fixed interference and separate solution methods affirming a high distinguishing power of the fabricated sensor toward Cr (III) ions over the other interfering ions. The established sensor could be utilized with a promising success for the Cr (III) ion estimation in the industrial waste water and in the pharmaceutical forms. Additionally, it has been employed as a promising indicator sensor with a superior performance for potentiometric titration of Cr (III) ion against EDTA. [Display omitted] •o-benzoyl benzoic acid has been explored for the first time to fabricate a novel modified carbon paste-based sensor.•The established sensor has been utilized with a superior performance for the selective Cr (III) ion detection.•The fabricated sensor achieved a Nernstian slope of 20.03 ± 0.11 mV decade−1 within the range of 5.0 × 10−7-1.0 × 10−1 mol L−1.•The developed sensor has been applied for Cr (III) ion detection in the pharmaceutical and industrial waste water samples.•The established sensor has been employed as an indicator electrode for potentiometric titration of Cr (III) with EDTA.