کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1163347 | 1490958 | 2015 | 7 صفحه PDF | دانلود رایگان |
• Life support system for human spaceflight missions.
• On-line chemical sensing in water recycling processes.
• Potentiometric determination of ammonium ion using a gas diffusion step.
• Samples of the Concordia station (Antarctica) gray water treatment plant.
The design, construction and evaluation of a versatile cyclic olefin copolymer (COC)-based continuous flow potentiometric microanalyzer to monitor the presence of ammonium ion in recycling water processes for future manned space missions is presented. The microsystem integrates microfluidics, a gas-diffusion module and a detection system in a single substrate. The gas-diffusion module was integrated by a hydrophobic polyvinylidene fluoride (PVDF) membrane. The potentiometric detection system is based on an all-solid state ammonium selective electrode and a screen-printed Ag/AgCl reference electrode. The analytical features provided by the analytical microsystem after the optimization process were a linear range from 0.15 to 500 mg L−1 and a detection limit of 0.07 ± 0.01 mg L−1. Nevertheless, the operational features can be easily adapted to other applications through the modification of the hydrodynamic variables of the microfluidic platform.
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Journal: Analytica Chimica Acta - Volume 874, 18 May 2015, Pages 26–32