Publication: High sensitivity and specificity simultaneous determination of lead, cadmium and copper using μpAD with dual electrochemical and colorimetric detection
4
0
Issued Date
2016
Resource Type
File Type
application/pdf
ISSN
9254005
Other identifier(s)
2-s2.0-84964635614
Rights Holder(s)
Scopus
Bibliographic Citation
Sensors and Actuators, B: Chemical. Vol 233, (2016), p.540-549
Suggested Citation
Chaiyo S., Apiluk A., Siangproh W., Chailapakul O. High sensitivity and specificity simultaneous determination of lead, cadmium and copper using μpAD with dual electrochemical and colorimetric detection. Sensors and Actuators, B: Chemical. Vol 233, (2016), p.540-549. doi:10.1016/j.snb.2016.04.109 Retrieved from: https://hdl.handle.net/20.500.14740/5063
Author(s)
Abstract
A bismuth-modified electrode can increase the sensitivity of lead and cadmium detection. However, use of a bismuth-modified electrode in the detection of copper remains limited because the bismuth signal overlaps with the signal for copper. In this study, we developed a new microfluidic paper-based analytical device (μPAD) coupled with dual electrochemical and colorimetric detection to obtain high sensitivity and specificity for the simultaneous determination of lead, cadmium and copper. The μPAD is divided into two parts. The first part is electrochemical detection for the determination of lead and cadmium using a bismuth-modified, boron-doped diamond electrode (Bi-BDDE). The limit of detection was 0.1 ng mL-1 (for both metals). The second part is colorimetric detection for the determination of copper based on the catalytic etching of silver nanoplates (AgNPls) by thiosulfate (S2O32-). The color of AgNPls on μPAD changed from pinkish violet to colorless after the addition of copper; this change can be monitored by naked eyes and its detection limit was5.0 ng mL-1 by the Image J analysis. The proposed method was applied for the simultaneous determination of these three metals in real samples and no significant differences in accuracy and precision were observed compared to the standard method. © 2016 Elsevier B.V. All rights reserved.
Subject(s)
Analytic equipment
Bismuth
Cadmium
Color
Colorimetry
Copper
Electrochemical electrodes
Electrodes
Lead
Microfluidics
Signal detection
Accuracy and precision
Boron doped diamond electrodes
Colorimetric detection
ELectrochemical detection
Limit of detection
Modified electrodes
Paper-based analytical devices
Simultaneous determinations
Chemical detection
Bismuth
Cadmium
Color
Colorimetry
Copper
Electrochemical electrodes
Electrodes
Lead
Microfluidics
Signal detection
Accuracy and precision
Boron doped diamond electrodes
Colorimetric detection
ELectrochemical detection
Limit of detection
Modified electrodes
Paper-based analytical devices
Simultaneous determinations
Chemical detection