Pulsed amperometric detection for phenol determination

การวัดปริมาณฟีนอลโดยพัลส์แอมเพอโรเมตริกดีเทกชัน

Name: Jularat Sookkwan

Organization : King Mongkut's University of Technology Thonburi. School of Bioresources and Technology. Biotechnology

keyword: Phenol

; Pulsed amperometric detection

; พัลส์แอมเพอโรเมตริกดีเทกชัน

Abstract: Phenol determination using pulsed amperometric detection (PAD) combined with flowinjection analysis (FIA) was described. Au and Pt were used as working electrodes tomeasure phenol in 0.1 M NaOH. A triple potential waveform consisting of Edet = +0.5 V(tder = 200 ms) at Au electrode, Edet = +0.6 V (tde, = 200 ms) at Pt electrode, Eoxd = +0.8V (bsd = 400 ms), and Ered = -0.8 V (tred = 200 ms) versus AgIAgCl, was employed. Ed,[caused the oxidation of phenol and supplied the analytical signal, whereas Eoxd and Eredwere for potentiostatic cleaning and reactivation of the electrode surface, respectively.The optimization procedure for choosing these conditions was described. Using the FIPAD,a linear response to phenol at the Edet for the Au electrode was obtained across theconcentration range 0.01 to 10 mM, with a sensitivity of 4.98 x 10" A m ~~"m -a~nd. alimit of detection of 0.01 mM (S/N = 3). A precision of 8.04 %.RSD at 5.0 mM for onehundred and thirty-four repetitive injections was obtained, whereas at the Edet of the Ptelectrode, a concentration range of 0.05 to 10 mM was obtained, with a sensitiiity of4.98 x 1 0 - h AM-' cm-" and a limit of detection of 0.016 mM (S/N = 3). A precision of8.77 % RSD at 5.0 mM for one hundred and fifteen repetitive injections was obtained.For comparison a glassy carbon working electrode was used for FI-amperometry at E =1.1 V. A linear response to phenol was obtained across the concentration range 0.3 to 5mM. with a sensitivity of 7.08 x 10'~A m ~ ~"m ' a~n,d a limit of detection of 0.006mM. A precision of 12.69 % RSD at 5.0 mM for seventy-five repetitive injections wasobtained. Hence, the operational stability of FI-PAD was better than that of FIamperometryat glassy carbon, but the FI-amperometry at glassy carbon proved to beinore sensitive.

King Mongkut's University Technology Thonburi

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Mithran Somasundrum

Role: Advisor

Created: 2004

Issued: 2007-07-17

Modified: 2008-06-18

วิทยานิพนธ์/Thesis

ISBN: 9741841485

CallNumber: BIT500

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Biotechnology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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