Development of an automated diffusion scrubber-conductometry system for measuring atmospheric ammonia

Bokyoung Lee, Chong Keun Lee, Dong Soo Lee

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Abstract

A semi-continuous and automated method for quantifying atmospheric ammonia at the parts per billion level has been developed. The instrument consists of a high efficiency diffusion scrubber, an electrolytic on-line anion exchange device, and a conductivity detector. Water soluble gases in sampled air diffuse through the porous membrane and are absorbed in an absorbing solution. Interferences are eliminated by using an anion exchange devises. The electrical conductivity of the solution is measured without chromatographic separation. The collection efficiency was over 99%. Over the 0-200 ppbv concentration range, the calibration was linear with r2 = 0.99. The lower limit of detection was 0.09 ppbv. A parallel analysis of Seoul air over several days using this method and a diffusion scrubber coupled to an ion chromatography system showed acceptable agreement, r2 = 0.940 (n = 686). This method can be applied for ambient air monitoring of ammonia.

Original languageEnglish
Pages (from-to)2039-2044
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume32
Issue number6
DOIs
Publication statusPublished - 2011 Jun 20

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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