| 摘要 |
Apparatus for monitoring low concentrations of nitrogen oxides and carbon monoxide in gas streams, in which carbon monoxide is determined by passing gas over iodine pentoxides to liberate quantative amounts of iodine vapour which are measured by means of a Pt-Act C or Ag/buffered halide cell associated with a galvanic cell, and nitrogen oxides are measured by passing gas through Pt-Act C or Ag/halide cells. Interfering gases are removed by known means prior to passage of gas through cell. NO concentrations may be determined in the presence of NO2, thus NO2 concentration may be determined by difference.
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