Please use this identifier to cite or link to this item:
Title: Lab-on-paper with dual electrochemical/ colorimetric detection for simultaneous determination of gold and iron
Authors: Apilux A.
Dungchai W.
Siangproh W.
Praphairaksit N.
Henry C.S.
Chailapakul O.
Keywords: Ag/AgCl
Aqua regia
Calibration curves
Colorimetric detection
Colorimetric methods
Concentration of
Concentration ranges
Correlation coefficient
Electrochemical determination
Inductively coupled plasma-atomic emission spectrometry
Limit of detection
Rapid screening
Reduction peak
Screening tool
Simultaneous determinations
Square wave voltammetry
Supporting electrolyte
Waste solution
Working conditions
Atomic emission spectroscopy
Curve fitting
Gold compounds
Inductively coupled plasma
Iron compounds
Metal refining
Chemical detection
statistical parameters
Limit of Detection
Issue Date: 2010
Abstract: A novel lab-on-paper device combining electrochemical and colorimetric detection for the rapid screening of Au(III) in the presence of a common interference, Fe(III), in industrial waste solutions is presented here. With dilute aqua regia (0.1 M HCl + 0.05 M HNO3) as the supporting electrolyte, square wave voltammetry on paper provided a well-defined reduction peak for Au(III) at ∼287 ± 12 mV vs Ag/AgCl. Under the optimized working conditions, the calibration curve showed good linearity in the concentration range of 1-200 ppm of Au(III) with a correlation coefficient of 0.997. The limit of detection (LOD) of the proposed method is 1 ppm. Interferences from various cations were also studied. Fe(III) is the only metal that affects the electrochemical determination of Au(III) when present above a 2.5-fold excess concentration of that of the Au(III). To overcome this limitation, a colorimetric method was used to simultaneously detect Fe(III) as a screening tool. The procedure was then successfully applied to determine Au(III) in gold-refining waste solutions. The results are in agreement with those obtained from inductively coupled plasma-atomic emission spectrometry (ICP-AES). © 2010 American Chemical Society.
ISSN: 32700
Appears in Collections:Scopus 1983-2021

Files in This Item:
There are no files associated with this item.

Items in SWU repository are protected by copyright, with all rights reserved, unless otherwise indicated.