Modified carbon paste electrode for potentiometric determination of diquat dibromide pesticide in water and urine samples

Abu Shawish, Hazem M. and Ghalwa, Nasser Abu and Hamada, Mazen and Basheer, Abdel-Hakem (2012) Modified carbon paste electrode for potentiometric determination of diquat dibromide pesticide in water and urine samples. Materials Science and Engineering: C, 32 (2). pp. 140-145. ISSN 09284931

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Abstract

A carbon paste electrode for diquat dibromide (Dq.2Br) was prepared and fully characterized in terms of composition, usable pH range, response time and temperature. The electrode was applied to the potentiometric determination of diquat ions in water and urine samples with average recoveries of 97.5–104.0% and relative standard deviations of 0.30–4.73%. The electrode is based on the ion pair, namely, diquat-phosphotungstate dissolved in 2-nitrophenyloctyl ether (2-NPOE) as pasting liquid with 1.0% Na-TPB as an additive. The modified electrode showed a near-Nernstian slope of 30.8 mV over the concentration range of 3.8 × 10− 6to 1.0 × 10− 3 M with the limit of detection 9.0 × 10− 7 over the pH range 4.5–9.5. The electrode exhibits good selectivity for Dq cations with respect to a large number of inorganic cations, organic cations, sugars and amino acids. The proposed potentiometric method offers the advantages of simplicity, accuracy, automation feasibility and applicability to turbid and colored sample solutions.

Item Type: Article
Subjects: Q Science > QD Chemistry
Depositing User: أ.د. حازم محمد عبد الحميد أبو شاويش
Date Deposited: 12 Mar 2018 16:03
Last Modified: 12 Mar 2018 16:03
URI: http://scholar.alaqsa.edu.ps/id/eprint/386

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