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Sampling and Measurement for Inorganic Gaseous Pollutants

Learn about CO and NO2 measuring instruments and protocols. Discover COED I and COED II monitors and the NDIR method. Understand Palmes tube NO2 monitors for accurate pollutant measurement.

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Sampling and Measurement for Inorganic Gaseous Pollutants

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  1. Sampling and Measurementfor Inorganic Gaseous Pollutants

  2. Measuring Instruments Measurement protocol depends largely on the objectives Personal Carbon Monoxide monitors • COED I and COED II monitors(CO Exposure Dosimeter) • Originally developed for EPA by General Electric • COED II was designed for use in a moving automobile Inorganic Gaseous Pollutants

  3. COED I monitors • Capable of recording 1600 data points over a 24-hour exposure period • Automatic data logging system • Works in the active mode by employing a small pump installed in the monitor • CO laden air is continuously drawn into an electro chemical cell which contains deionized water Inorganic Gaseous Pollutants

  4. COED I monitors • CO reacts with water and changes its properties in a manner that is proportional to CO concentration • Concentration of CO is directly read from the LCD display in ppm • Interference from NO2 is avoided by using a filter coated with an oxidizing agent Inorganic Gaseous Pollutants

  5. NDIR method • Non dispersive infrared (NDIR) photometry is also commonly used for measuring CO and CO2 • Involves determining the difference in the infrared energy absorption over all wavelengths • Difference in the infrared energy absorbed is proportional to the concentration of compound in the sample gas Inorganic Gaseous Pollutants

  6. NO2 monitors • Several types of personal NO2 monitors have been developed • Most commonly used is known as Palmes tube • Works in a passive mode and works on the principle of molecular diffusion • Sampler consists of three stainless steel screens coated with triethanolamine • One end of the tube is capped permanently while the other end has a removable cap Inorganic Gaseous Pollutants

  7. Palmes tube • Tube is exposed to air by removing the cap • Concentration of NO2 is determined from the intensity of resultant color by using a spectrophotometer • A minimum amount of .05 mg must be collected on the wire screens to provide an accurate measurement • Sampling time is approximately 24 hours Inorganic Gaseous Pollutants

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