Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya

Hanging mercury dropping electrode (HMDE), carbon paste electrode (CPE), screenprinted carbon electrode combined with Ag/AgCl (SPCE Ag/AgCl), and screenprinted carbon electrode combined with Ag/AgCl and Ag (SPCE Ag/AgCl & Ag) have been applied as working electrodes in determination of amaranth,...

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Main Author:	Sarikawi, Siti Hadijah
Format:	Thesis
Language:	English
Published:	2008
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/18086/1/SitiHadijahSarikawiMFS2008.pdf
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id	my-utm-ep.18086
record_format	uketd_dc
spelling	my-utm-ep.180862018-07-25T08:01:21Z Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya 2008-07 Sarikawi, Siti Hadijah QD Chemistry Hanging mercury dropping electrode (HMDE), carbon paste electrode (CPE), screenprinted carbon electrode combined with Ag/AgCl (SPCE Ag/AgCl), and screenprinted carbon electrode combined with Ag/AgCl and Ag (SPCE Ag/AgCl & Ag) have been applied as working electrodes in determination of amaranth, tartrazine and both dyes mixture. Cyclic voltammetry (CV) studies showed that amaranth, tartrazine and the mixture of both dyes were able to reduce at the surface of HMDE, CPE, SPCE Ag/AgCl and SPCE Ag/AgCl & Ag in acidic pH medium. Parameters optimization using differential pulse voltammetry (DPV) technique showed that the pH of supporting electrolyte, accumulation time, scanning and stirring rate affected the current value (Ip) of the dyes reduction peak produced via these electrodes. Application of SPCE Ag/AgCl with DPV technique in Britton-Robinson (BR) buffer pH 2.31 at non-aerated condition was able to detect reduction peak of amaranth and tartrazine. Chemical pre-treatment of SPCE Ag/AgCl & Ag with 1 M NaHCO3 solution has succeeded producing low limit of detection (LOD) as small as 10-8 M. The usage of HMDE for determination of amaranth, tartrazine and both dyes mixture produced LOD 3.2 x 10-9 M - 11.6 x 10-9 M. The usage of CPE for determination of amaranth, tartrazine and both dyes mixture produced bigger LOD which is 7.5 x 10-9 M - 3 x 10-8 M. The usage of SPCE Ag/AgCl for determination of amaranth and tartrazine in cell produced LOD 7.7 x 10-7 M and 8.1 x 10-7 M respectively. The usage of SPCE Ag/AgCl in beaker produced LOD 10.2 x 10-7 M for amaranth and 7.4 x 10-7 M for tartrazine. The usage of SPCE Ag/AgCl & Ag for determination of amaranth, tartrazine and both dyes mixture produced LOD 1.6 x 10-8 M - 11 x 10-8 M. The repeatability of these electrodes in producing consistent reduction peak current for the dyes is as follows: HMDE > CPE > SPCE Ag/AgCl & Ag > SPCE Ag/AgCl 2008-07 Thesis http://eprints.utm.my/id/eprint/18086/ http://eprints.utm.my/id/eprint/18086/1/SitiHadijahSarikawiMFS2008.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85227?queryType=vitalDismax&query=Penggunaan+teknik+voltammetri+bagi+penentuan+pewarna+amaranth%2C+tartrazina+dan+campuran+kedua-duanya&public=true masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Sarikawi, Siti Hadijah Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
description	Hanging mercury dropping electrode (HMDE), carbon paste electrode (CPE), screenprinted carbon electrode combined with Ag/AgCl (SPCE Ag/AgCl), and screenprinted carbon electrode combined with Ag/AgCl and Ag (SPCE Ag/AgCl & Ag) have been applied as working electrodes in determination of amaranth, tartrazine and both dyes mixture. Cyclic voltammetry (CV) studies showed that amaranth, tartrazine and the mixture of both dyes were able to reduce at the surface of HMDE, CPE, SPCE Ag/AgCl and SPCE Ag/AgCl & Ag in acidic pH medium. Parameters optimization using differential pulse voltammetry (DPV) technique showed that the pH of supporting electrolyte, accumulation time, scanning and stirring rate affected the current value (Ip) of the dyes reduction peak produced via these electrodes. Application of SPCE Ag/AgCl with DPV technique in Britton-Robinson (BR) buffer pH 2.31 at non-aerated condition was able to detect reduction peak of amaranth and tartrazine. Chemical pre-treatment of SPCE Ag/AgCl & Ag with 1 M NaHCO3 solution has succeeded producing low limit of detection (LOD) as small as 10-8 M. The usage of HMDE for determination of amaranth, tartrazine and both dyes mixture produced LOD 3.2 x 10-9 M - 11.6 x 10-9 M. The usage of CPE for determination of amaranth, tartrazine and both dyes mixture produced bigger LOD which is 7.5 x 10-9 M - 3 x 10-8 M. The usage of SPCE Ag/AgCl for determination of amaranth and tartrazine in cell produced LOD 7.7 x 10-7 M and 8.1 x 10-7 M respectively. The usage of SPCE Ag/AgCl in beaker produced LOD 10.2 x 10-7 M for amaranth and 7.4 x 10-7 M for tartrazine. The usage of SPCE Ag/AgCl & Ag for determination of amaranth, tartrazine and both dyes mixture produced LOD 1.6 x 10-8 M - 11 x 10-8 M. The repeatability of these electrodes in producing consistent reduction peak current for the dyes is as follows: HMDE > CPE > SPCE Ag/AgCl & Ag > SPCE Ag/AgCl
format	Thesis
qualification_level	Master's degree
author	Sarikawi, Siti Hadijah
author_facet	Sarikawi, Siti Hadijah
author_sort	Sarikawi, Siti Hadijah
title	Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
title_short	Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
title_full	Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
title_fullStr	Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
title_full_unstemmed	Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
title_sort	penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2008
url	http://eprints.utm.my/id/eprint/18086/1/SitiHadijahSarikawiMFS2008.pdf
_version_	1747815189291466752

Penggunaan teknik voltammetri bagi penentuan pewarna amaranth, tartrazina dan campuran kedua-duanya

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