Practice question

Colorimetric detector tubes work by:

  1. Measuring radiation by counting ionizing events
  2. Producing a color change of a chemical reagent that indicates the presence and concentration of a specific gas
  3. Detecting all volatile organics with a UV lamp
  4. Reading the percent oxygen electrochemically

Answer: B — Producing a color change of a chemical reagent that indicates the presence and concentration of a specific gas

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