Please use this identifier to cite or link to this item: http://ir.swu.ac.th/jspui/handle/123456789/14712
Title: Determination of trace heavy metals in herbs by sequential injection analysis-anodic stripping voltammetry using screen-printed carbon nanotubes electrodes
Authors: Injang U.
Noyrod P.
Siangproh W.
Dungchai W.
Motomizu S.
Chailapakul O.
Keywords: Anodic stripping voltammetry
Bismuth film
Carbon ink
Concentration levels
Deposition time
High sensitivity
High throughput
ICP-AES
In-situ
Limits of detection
Linear range
Measurement frequency
Online monitoring
Operational parameters
Optimal conditions
Pre-concentration
Screen-printed
Sequential injection analysis
Simultaneous determinations
Trace heavy metals
Atomic emission spectroscopy
Bioelectric phenomena
Bismuth
Chemical vapor deposition
Electrodes
Lead
Metal analysis
Metals
Optimization
Stripping (dyes)
Trace analysis
Trace elements
Voltammetry
Zinc
Zinc compounds
Carbon nanotubes
bismuth
cadmium
carbon nanotube
lead
zinc
anodic stripping potentiometry
article
concentration (parameters)
controlled study
electrode
flow rate
herb
priority journal
sensitivity analysis
sequential injection analysis
Andrographis
Bismuth
Cadmium
Electrochemical Techniques
Electrodes
Flow Injection Analysis
Lead
Metals, Heavy
Nanotubes, Carbon
Plant Leaves
Zinc
Sia
Issue Date: 2010
Abstract: A method for the simultaneous determination of Pb(II), Cd(II), and Zn(II) at low μgL-1 concentration levels by sequential injection analysis-anodic stripping voltammetry (SIA-ASV) using screen-printed carbon nanotubes electrodes (SPCNTE) was developed. A bismuth film was prepared by in situ plating of bismuth on the screen-printed carbon nanotubes electrode. Operational parameters such as ratio of carbon nanotubes to carbon ink, bismuth concentration, deposition time and flow rate during preconcentration step were optimized. Under the optimal conditions, the linear ranges were found to be 2-100μgL-1 for Pb(II) and Cd(II), and 12-100μgL-1 for Zn(II). The limits of detection (Sbl/S=3) were 0.2μgL-1 for Pb(II), 0.8μgL-1 for Cd(II) and 11μgL-1 for Zn(II). The measurement frequency was found to be 10-15stripping cycleh-1. The present method offers high sensitivity and high throughput for on-line monitoring of trace heavy metals. The practical utility of our method was also demonstrated with the determination of Pb(II), Cd(II), and Zn(II) by spiking procedure in herb samples. Our methodology produced results that were correlated with ICP-AES data. Therefore, we propose a method that can be used for the automatic and sensitive evaluation of heavy metals contaminated in herb items. © 2010 Elsevier B.V.
URI: https://www.scopus.com/inward/record.uri?eid=2-s2.0-77952669111&doi=10.1016%2fj.aca.2010.01.018&partnerID=40&md5=fe6f1a07ef7d376a5ca359ee001468f0
http://ir.swu.ac.th/jspui/handle/123456789/14712
ISSN: 32670
Appears in Collections:Scopus 1983-2021

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