15.APPENDIX E: CALCULATION OF DYNACALIBRATOR H2S CONCENTRATION
UNIT DEFINITIONS mole / 6.02@1023 molecules
nanogram (ngm) = gm 10 9
PPMv /
CALCULATIONS
| (molar volume @ 25 oC) ∗ (tube permeation rate) |
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| 24.45 |
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| ∗ | 5090∗ | | |||||
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| 34.07 | ∗ |
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| = 0.512 PPMv | ||||
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| | 7138∗ | ml |
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Mole units divide out, as do mass units, leaving volume per minute in both the numerator and the denominator. This leaves a unitless quantity scaled by 1 x 106 in the denominator that is the definition of PPM.
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