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Surface Modified Thread-Based Microfluidic Analytical Device for Selective Potassium Analysis
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DOI：10.1021/acs.analchem.6b00633.png)
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This paper presents a thread-based microfluidic device (mu TAD) that includes ionophore extraction chemistry for the optical recognition of potassium. The device is 1.5 cm x 1.0 cm and includes a cotton thread to transport the aqueous sample via capillary wicking to a 5 mm-long detection area, where the recognition chemistry is deposited that reaches equilibrium in 60 s, changing its color between blue and magenta. A complete characterization of the cotton thread used as well as the sensing element has been carried out. The imaging of the mu TAD with a digital camera and the extraction of the H coordinate of the HSV color space used as the analytical parameter make it possible to determine K(I) between 2.4 x 10(-5) and 0.95 M with a precision better than 1.3%.
Keyword:
BULK OPTODES
OPTICAL SENSOR
IONOPHORES
ELECTRODES
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6.7
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4.7W
被引数:
15.9W
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