15.APPENDIX E: CALCULATION OF DYNACALIBRATOR H2S CONCENTRATION

UNIT DEFINITIONS mole / 6.02@1023 molecules

nanogram (ngm) = gm 10 9

PPMv / 10-6

CALCULATIONS

 

(molar volume @ 25 oC) ∗ (tube permeation rate)

 

 

 

(molecular weight of H 2S)

 

= PPM volume/volume

 

(total gas flow rate)

 

 

 

 

 

 

 

 

 

ltr 

 

 

 

 

 

 

 24.45

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mole

 

 

ngm

 

 

 

 

 

 

 

 

 

5090∗

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

gm 

 

 

min

 

 34.07

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mole 

 

 

 

 

= 0.512 PPMv

 

 

 

 

7138∗

ml 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

min 

 

 

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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Arizona Jerome 631-X operation manual Molecular weight of H 2S, Appendix E Calculation of Dynacalibrator H2S Concentration