Publication:
Lab-on-paper with dual electrochemical/ colorimetric detection for simultaneous determination of gold and iron

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Issued Date

2010

Resource Type

Article

File Type

application/pdf

ISSN

32700

DOI

10.1021/ac9022555

Other identifier(s)

2-s2.0-77749302316

Rights Holder(s)

Scopus

Bibliographic Citation

Analytical Chemistry. Vol 82, No.5 (2010), p.1727-1732

Suggested Citation

Apilux A., Dungchai W., Siangproh W., Praphairaksit N., Henry C.S., Chailapakul O. Lab-on-paper with dual electrochemical/ colorimetric detection for simultaneous determination of gold and iron. Analytical Chemistry. Vol 82, No.5 (2010), p.1727-1732. doi:10.1021/ac9022555 Retrieved from: https://hdl.handle.net/20.500.14740/7609

Title

Lab-on-paper with dual electrochemical/ colorimetric detection for simultaneous determination of gold and iron

Author(s)

Apilux A.
 Dungchai W.
 Siangproh W.
 Praphairaksit N.
 Henry C.S.
 Chailapakul O.

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.

Subject(s)

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
 Color
 Colorimetry
 Curve fitting
 Gold compounds
 Inductively coupled plasma
 Iron compounds
 Metal refining
 Chemical detection
 Gold
 Iron
 Article
 Colorimetry
 Electrochemistry
 Methodology
 Statistical parameters
 Colorimetry
 Electrochemistry
 Gold
 Iron
 Limit of Detection

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URI

https://hdl.handle.net/20.500.14740/7609

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Scopus: Year 1983-2021

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