Portable analyzer for continuous monitoring of sulfur dioxide in gas stream based on amperometric detection and stabilized gravity-driven flow
| Autor: | Mohamed A. Alnaqbi, Mohamed Al-Marzouqi, Muna Bufaroosha, Sayed A.M. Marzouk |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Spectrum analyzer
010401 analytical chemistry Metals and Alloys Analytical chemistry Scrubber 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Reference electrode Amperometry Gas analyzer 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Sulfite Electrode Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology Instrumentation Sulfur dioxide |
| Zdroj: | Sensors and Actuators B: Chemical. 225:24-33 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2015.11.008 |
| Popis: | The construction, optimization and application are described for a portable gas analyzer which gives real-time measurement of sulfur dioxide in a gas stream. The SO2 is absorbed from the analyte gas stream into a gravity-driven carrier solution flowing through a diffusion scrubber (DS), in the form of a bundle of polymeric hollow fibers. The sulfite ions in the carrier solution are detected by anodic amperometry at a novel carbon nanotube (CNT) electrode polarized at 0.35 V vs Ag/AgCl reference electrode. A novel compact design is the result of integrating the DS with the amperometric detector and yields a light weight portable analyzer (900 g) with a small footprint. The optimized analyzer has favorable performance characteristics such as (i) good sensitivity (LOD = 4 ppm, S/N = 3), (ii) wide linear dynamic range up to 5000 ppm, (iii) reasonably fast response time (t95%, 4.1 min), (iv) excellent signal stability and repeatability (RSD = 1.3%), and (v) continuous standalone operation for 6 h. The interfering effect of H2S is avoided by removing H2S using a prior guard column. The analyzer can successfully monitor the removal of SO2 from SO2-N2 gas mixtures and in determining sulfite in foodstuffs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect