Highly Sensitive and Selective Amperometric Determination of Nitrite Using Mwcnt-Tetra Amino Metal Phthalocyanines Anchored Poly (1,3,4-Oxadiazole Arylene Ether)S
22 Pages Posted: 6 Apr 2020 Last revised: 7 Apr 2020
The present work describes a simple method for the synthesis of phenolphthalein based poly(1,3,4-oxadiazole arylene ether)s (PHOP) was high-toned by structural modification with tetra amino metal phthalocyanine (TAMPc, M = Co, Ni & Cu) complex with an equivalent ratio of (10, 20 & 30 wt%). All these specially attune made polymers were well characterized by TGA, XRD analysis, Solid - state UV-Vis, FTIR, and 1 H–NMR spectroscopic and analytical techniques confirms substituted TAMPc units are grafted in the polymer matrix. The modifying the GCE with novel substituted tetra amino metal phthalocyanine with MWCNT to investigate nitrite sensing using different electrochemical techniques are cyclic voltammogram (CV), Differential pulse voltammetry (DPV) and Chronoamperometry (CA). The composite GCE was used to examine as electrocatalytic performance for oxidation of NaNO 2 . Modified electrode detects the nitrite with a long linear range 0.1-1.8 µM L - 1 (CV), 0.05-0.8 (DPV) and 0.05-0.8 (CA) and sensitivity 38.5302 µM L - 1 (CV), 3.043 µM L - 1 (DPV), and 695.14 µM L - 1 (CA), the limit of detection (LOD) is 0.03 µM L - 1 (CV), 0.016 µM L - 1 (DPV) and 0.01 µM L - 1 (CA) obtained using CVs. The repeatability of the drop coated with a composite material sensor, in terms examine of RSD was 1.6 % for 12 measurements of a solution of 11.58 µmol L - 1 NaNO 2 . The sensor employed to determine nitrite in rainwater, river water, and lake water samples showed to be a favorable tool for this purpose.
Keywords: Tetra amino metal phthalocyanine, Nitrite senser, CVs, DPV, Amperometry.
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