Highly sensitive potentiometric sensors for thorium ions detection using morpholine derivative self-assembled on silver nanoparticles. Issue 81 (16th August 2016)

• Record Type: Journal Article
• Authors: Akl, Zeinab F.; Ali, Tamer Awad
• Is Part Of: RSC advances. Volume 6:Issue 81(2016)
• Page Start: 77854
• Page End: 77862
• Publication Date: 2016-08-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra14784d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Potentiometric screen-printed electrodes were constructed for Th(iv ) determination in water samples. The optimized electrodes exhibited fast response time, wide linear range, low detection limit and high selectivity towards Th(iv ) ions. Abstract : In this work, 1-dodecyl-4-(((3-morpholinopropyl)imino)methyl)pyridin-1-ium bromide (DMP-Br) [L1] was synthesized and self-assembled on silver nanoparticles (DMP-Br-SNPs) [L2]. The prepared compounds were used in the fabrication of screen-printed electrodes to quantitatively sense Th(iv ) in real samples conditions. The optimized electrodes based on L1 and L2 exhibited Nernstian slopes of 14.30 ± 0.71 and 15.11 ± 0.47 mV per decade over Th(iv ) concentration ranges of 4.0 × 10 −7 to 1.0 × 10 −1 and 6.3 × 10 −9 to 1.0 × 10 −1 mol L −1 with detection limits of 4.0 × 10 −7 and 6.3 × 10 −9 mol L −1 ; respectively. In addition, these electrodes showed independent response in the pH ranges 2.5–9.0 and 2.0–9.5, and fast response times of 11 and 5 seconds. Based on durability study results, the optimized electrodes containing L1 and L2 can be used for more than 6 and 7 months, respectively, without any divergence in the electrode potential. Selectivity studies showed that incorporation of SNPs led to enhanced selectivity toward Th(iv ) over a wide variety of other metal ions. The effect of solution temperature on the electrode performance was investigated in the range 10–50 °C and the electrodes' isothermal temperature coefficients (d E °/d T ) were calculated. The developed electrodes have been successfully applied for Th(iv ) ion potentiometric determination in water samples with sensitivity comparable to the reference method and the ability of field measurement.