کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
744171 1644971 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Portable analyzer for continuous monitoring of sulfur dioxide in gas stream based on amperometric detection and stabilized gravity-driven flow
ترجمه فارسی عنوان
آنالایزر قابل حمل برای نظارت مستمر دی اکسید گوگرد در جریان گاز بر اساس تشخیص آمپرترتریک و جریان گرانشی ثابت
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• First report on a portable gas analyzer for SO2 based on amperometric detector.
• Novel CNT amperometric electrode which provided stable sulfite detection.
• Novel stabilized gravity-driven carrier flow provided excellent response stability.
• The analyzer provided several merits and standalone operation for 6 h.
• Novel design provided compact and light-weight analyzer (900 g).

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 225, 31 March 2016, Pages 24–33
نویسندگان
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