Disposable Paper-Based Analytical Device for Visual Speciation Analysis of Ag(I) and Silver Nanoparticles (AgNPs)
| Autor: | Kailai Xu, Qinlei Liu, Chengbin Zheng, Li Wu, Xiandeng Hou, Jing Xiong, Yao Lin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Capillary action
Chemistry media_common.quotation_subject 010401 analytical chemistry Analytical chemistry Paper based 010402 general chemistry 01 natural sciences Fluorescence Silver nanoparticle Cation exchange reaction Cadmium telluride photovoltaics 0104 chemical sciences Analytical Chemistry Speciation Quantum dot media_common |
| Zdroj: | Analytical Chemistry. 91:3359-3366 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | A disposable, instrument-free, height readout paper-based analytical device (HR-PAD) based on a paper strip inkjet-printed with CdTe quantum dots (QDs) was developed for the sensitive speciation analysis of Ag+ and silver nanoparticles (AgNPs). When the paper strip is immersed into a sample solution, capillary action draws it through the surface and any Ag+ in the solution quenches the fluorescence of CdTe QDs via a cation exchange reaction between Ag+ and the CdTe QDs, with the height of the quenched band being proportional to the concentration of Ag+. In contrast, fluorescence quenching cannot be observed when only AgNPs are present in solution. Thus, the concentration of AgNPs can be obtained by subtracting the Ag+ content from the total silver determined by the HR-PAD after digestion with HNO3. Under optimized conditions, the methodology provides high selectivity, sensitivity, and accuracy for the detection of Ag+ or AgNPs in various samples, even at concentrations as low as 0.05 mg L-1. Precisions of 4.5% and 2.2% RSDs were achieved at concentrations of 1 mg L-1 and 7 mg L-1 of Ag+, respectively. Compared to conventional methods, this approach is inexpensive and user-friendly and eliminates the need for expensive and sophisticated detection instruments. The practicality of the method was demonstrated via the speciation analysis of AgNPs and Ag+ in river water and 12 commercial products with satisfactory results. |
| Databáze: | OpenAIRE |
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