Surface Modified Thread-Based Microfluidic Analytical Device for Selective Potassium Analysis

被引：62
|
作者：
Erenas, Miguel M. [1 ]
de Orbe-Paya, Ignacio [1 ]
Fermin Capitan-Vallvey, Luis [1 ]
机构：
[1] Univ Granada, Fac Sci, Dept Analyt Chem, Campus Fuentenueva, E-18071 Granada, Spain
来源：
ANALYTICAL CHEMISTRY | 2016年 / 88卷 / 10期
关键词：
BULK OPTODES; OPTICAL SENSOR; IONOPHORES; ELECTRODES;
D O I：
10.1021/acs.analchem.6b00633
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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%.
引用
收藏
页码：5331 / 5337
页数：7
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