| Autor: |
Idros N; Centre for Photonic Devices and Sensors, Department of Engineering , University of Cambridge , Cambridge CB3 0FA , United Kingdom.; Institute of Nano Electronic Engineering , Universiti Malaysia Perlis , Lot 106, 108 & 110, Tingkat 1, Block A, Taman Pertiwi Indah, Jalan Kangar-Alor Setar, Seriab, 01000 Kangar , Perlis , Malaysia., Chu D; Centre for Photonic Devices and Sensors, Department of Engineering , University of Cambridge , Cambridge CB3 0FA , United Kingdom. |
| Jazyk: |
angličtina |
| Zdroj: |
ACS sensors [ACS Sens] 2018 Sep 28; Vol. 3 (9), pp. 1756-1764. Date of Electronic Publication: 2018 Sep 19. |
| DOI: |
10.1021/acssensors.8b00490 |
| Abstrakt: |
Heavy metals are highly toxic at trace levels and their pollution has shown great threat to the environment and public health worldwide where current detection methods require expensive instrumentation and laborious operation, which can only be accomplished in centralized laboratories. Herein, we report a low-cost, paper-based microfluidic analytical device (μPAD) for facile, portable, and disposable monitoring of mercury, lead, chromium, nickel, copper, and iron ions. Triple indicators or ligands that contain ions or molecules are preloaded on the μPADs and upon addition of a metal ion, the colorimetric indicators will elicit color changes observed by the naked eyes. The color features were quantitatively analyzed in a three-dimensional space of red, green, and blue or the RGB-space using digital imaging and color calibration techniques. The sensing platform offers higher accuracy for cross references, and is capable of simultaneous detection and discrimination of different metal ions in even real water samples. It demonstrates great potential for semiquantitative and even qualitative analysis with a sensitivity below the safe limit concentrations, and a controlled error range. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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