Analyzer for continuous monitoring of H 2S in gas streams based on a novel thermometric detection

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10 Citations (Scopus)


Development, characterization, and application of a novel gas analyzer for continuous monitoring for hydrogen sulfide (H 2S) in gas streams are presented. The principle of operation is based on absorbing H 2S from the analyte gas stream into aqueous sodium hydroxide solution flowing through a custom-made hollow fiber membrane (HFM) contactor (diffusion scrubber). The stripped sulfide ions in the alkaline solution are oxidized in line with hydrogen peroxide solution. The redox reaction is significantly exothermic and the temperature rise (ΔT) of the flowing mixed reagent stream is measured and proved as useful novel analytical signal for the quantification of H 2S. The analyzer exhibited linear response to H 2S concentrations for at least two orders of magnitude, i.e., 0.05-5.0% (r 2 = 0.9996). The analyzer exhibited excellent selectivity in the presence of several common gases such as CO 2, CO, CH 4, O 2 and N 2 whereas SO 2 exerts positive interference (∼22%). The analyzer exhibited excellent signal repeatability (CV < 1%), excellent signal stability (2 h at least) and acceptable response time (t 95%) of 7 min. In addition to the favorable performance characteristics, the presented analyzer offers several other advantages such as long operational life time, conveniently tuned sensitivity, low cost of construction and operation; (iv) short setup time, and (v) high reliability. The analyzer was successfully applied in monitoring the removal of H 2S from gas stream using a lab scale setup.

Original languageEnglish
Pages (from-to)377-383
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - Feb 20 2012


  • Diffusion scrubber
  • Gas analyzers
  • Hydrogen sulfide determination
  • Thermometric detector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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