Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 233, Issue -, Pages 540-549Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.04.109
Keywords
Lead; Cadmium; Copper; Microfluidic paper-based analytical device; Dual detection
Funding
- Thailand Research Fund (TRF) via the Royal Golden Jubilee Ph.D, program [PHD/0127/2556]
- Thailand Research Fund via the Research Team Promotion Grant [RTA5780005]
- 90th Anniversary of Chulalongkorn University Fund [GCUGR1125582008D]
- Srinakharinwirot University
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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 (mu PAD) coupled with dual electrochemical and colorimetric detection to obtain high sensitivity and specificity for the simultaneous determination of lead, cadmium and copper. The mu PAD 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 (AgNP1s) by thiosulfate (S2O32). The color of AgNPls on mu PAD changed from pinkish violet to colorless after the addition of copper; this change can be monitored by naked eyes and its detection limit was 5.0 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. (C) 2016 Elsevier B.V. All rights reserved.
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