A novel sensor for the determination of Hg2+ in waters based on octadentate ligand immobilized multi-walled carbon nanotube attached to paraffin wax impregnated graphite electrodes (PIGE)

Gayathri, Jayagopi; Selvan, Kumar Sangeetha; Narayanan, S. Sriman

doi:10.1007/s10008-018-3984-1

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…The excellent selectivity of the detection system may arise from the specific complex formation of N-terminus of NHSS (NOH) as N–Hg 2+ –N, which is similar to previous reports . It has also been reported that hydroxyl groups (NOH in our case) have selective and strong chelating ability toward Hg 2+ . The complex formation thereby prevents the ECL reaction, leading to ECL quenching.…”

Section: Resultssupporting

confidence: 89%

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Efficient Electrogenerated Chemiluminescence of Tris(2,2′-bipyridine)ruthenium(II) with N-Hydroxysulfosuccinimide as a Coreactant for Selective and Sensitive Detection of l-Proline and Mercury(II)

Saqib

Bashir

et al. 2019

Anal. Chem.

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Developing rapid, specific, and low-cost electrogenerated chemiluminescence (ECL) systems remains a compelling goal for many applications including environmental analysis, clinical diagnostics, and food safety. In this study, N-hydroxysuccinimide (NHS) esters, especially N-hydroxysulfosuccinimide (NHSS), was exploited for the first time as an efficient coreactant for anodic Ru(bpy)3 2+ ECL in neutral medium. Among the three tested NHS esters (NHS, NHSS, NHPI), the NHSS exhibited much higher ECL intensity and stability than the sulfonate-free esters, suggesting the essential role of both the N-hydroxy (NOH) and sulfonate (SO3H) moieties in the developed Ru(bpy)3 2+ ECL system. The ECL generation process is rather straightforward, not requiring time-consuming fabrication/modification steps of electrodes. The anodic Ru(bpy)3 2+–NHSS system achieved ECL detections with high selectivity and sensitivity toward l-proline (LOD = 50 nM) and Hg2+ (LOD = 10 nM), with a linear range of 0.5–200 μM and 0.1–25 μM, respectively. The method showed good recoveries (95.2–104.8%) for l-proline and Hg2+ detection in real samples. This study is a successful step toward the development of new coreactants and may open new avenues for the applications of N-hydroxy compounds in ECL sensing.

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Section: Resultssupporting

confidence: 89%

“…47 It has also been reported that hydroxyl groups (NOH in our case) have selective and strong chelating ability toward Hg 2+ . 48 The complex formation thereby prevents the ECL reaction, leading to ECL quenching. The selective decrease in oxidation current proved the selectivity for Hg 2+ detection (Figure 7D).…”

Section: ■ Results and Discussionmentioning

confidence: 99%