Selective colorimetric detection of dissolved ammonia in water via modified Berthelot's reaction on porous paper

Title
Selective colorimetric detection of dissolved ammonia in water via modified Berthelot's reaction on porous paper
Author
전형필
Keywords
Dissolved ammonia sensor; Colorimetric sensor; Berthelot's method; Paper-based sensor
Issue Date
2018-03
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 256, Page. 167-175
Abstract
Continuous monitoring and rapid on-site determination of toxic ammonia in various aqueous systems are important for maintaining water quality and preserving the environment. Though several methods such as flow-based spectrophotometry are currently utilized for this purpose, there is still need for more selective ammonia determination. We present a new detection route for quantifying NH3 in water samples by means of the evaporation of dissolved ammonia into headspace, followed by selective detection using a colorimetric sensor. Gaseous NH3 detection is attained by the selective formation of blue indophenol dye through modified Berthelot's reaction on porous paper. To optimize the sensing layer in terms of uniform and intense coloration, the water-soluble powder reagents were homogeneously dispersed in nonpolar cyclohexane and then deposited by a vacuum-assisted filtration on the paper substrate. The formation of indophenol blue was activated under highly humidified conditions through selective chemical reactions between solid-state Berthelot's reagents and NH3. The colorimetric response of the low-cost paper sensors was saturated within 10 min, and color change was observed by the naked eye for an ammonia solution of 10 mg/L. Furthermore, the response magnitude was not affected by addition of 0.1 wt% polar organic solvents (ethanol, acetone, dimethylformamide or acetic acid) or inorganic salts (NaCl, KCl, MgSO4 or CaSO4), suggesting a good detection cross-selectivity. (C) 2017 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S092540051731969Xhttp://repository.hanyang.ac.kr/handle/20.500.11754/80980
ISSN
0925-4005
DOI
10.1016/j.snb.2017.10.069
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
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