| Test gas
| Generation
| Verification
|
|---|
| Ammonia | Permeation device. Similar to system described in references 1 and 2 | Indophenol method, reference 3.
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| Carbon dioxide | Cylinder of zero air or nitrogen containing CO2 as required to obtain the concentration specified in table B-3 | Use NIST-certified standards whenever possible. If NIST standards are not available, obtain 2 standards from independent sources which agree within 2 percent, or obtain one standard and submit it to an independent laboratory for analysis, which must agree within 2 percent of the supplier's nominal analysis.
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| Carbon monoxide | Cylinder of zero air or nitrogen containing CO as required to obtain the concentration specified in table B-3 | Use an FRM CO analyzer as described in reference 8.
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| Ethane | Cylinder of zero air or nitrogen containing ethane as required to obtain the concentration specified in table B-3 | Gas chromatography, ASTM D2820, reference 10. Use NIST-traceable gaseous methane or propane standards for calibration.
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| Ethylene | Cylinder of pre-purified nitrogen containing ethylene as required to obtain the concentration specified in table B-3 | Do.
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| Hydrogen chloride | Cylinder
1 of pre-purified nitrogen containing approximately 100 ppm of gaseous HCl. Dilute with zero air to concentration specified in table B-3 | Collect samples in bubbler containing distilled water and analyze by the mercuric thiocyanate method, ASTM (D612), p. 29, reference 4.
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| Hydrogen sulfide | Permeation device system described in references 1 and 2 | Tentative method of analysis for H2S content of the atmosphere, p. 426, reference 5.
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| Methane | Cylinder of zero air containing methane as required to obtain the concentration specified in table B-3 | Gas chromatography ASTM D2820, reference 10. Use NIST-traceable methane standards for calibration.
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| Nitric oxide | Cylinder
1 of pre-purified nitrogen containing approximately 100 ppm NO. Dilute with zero air to required concentration | Gas phase titration as described in reference 6, section 7.1.
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| Nitrogen dioxide | 1. Gas phase titration as described in reference 6
2. Permeation device, similar to system described in reference 6 | 1. Use an FRM NO2 analyzer calibrated with a gravimetrically calibrated permeation device.
2. Use an FRM NO2 analyzer calibrated by gas-phase titration as described in reference 6.
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| Ozone | Calibrated ozone generator as described in reference 9 | Use an FEM ozone analyzer calibrated as described in reference 9.
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| Sulfur dioxide | 1. Permeation device as described in references 1 and 2
2. Dynamic dilution of a cylinder containing approximately 100 ppm SO2 as described in Reference 7 | Use an SO2 FRM or FEM analyzer as described in reference 7.
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| Water | Pass zero air through distilled water at a fixed known temperature between 20° and 30 °C such that the air stream becomes saturated. Dilute with zero air to concentration specified in table B-3 | Measure relative humidity by means of a dew-point indicator, calibrated electrolytic or piezo electric hygrometer, or wet/dry bulb thermometer.
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| Xylene | Cylinder of pre-purified nitrogen containing 100 ppm xylene. Dilute with zero air to concentration specified in table B-3 | Use NIST-certified standards whenever possible. If NIST standards are not available, obtain 2 standards from independent sources which agree within 2 percent, or obtain one standard and submit it to an independent laboratory for analysis, which must agree within 2 percent of the supplier's nominal analysis.
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| Zero air | 1. Ambient air purified by appropriate scrubbers or other devices such that it is free of contaminants likely to cause a detectable response on the analyzer
2. Cylinder of compressed zero air certified by the supplier or an independent laboratory to be free of contaminants likely to cause a detectable response on the analyzer
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