Arizona Hydrogen Sulfide Analyzer Jerome 631-X - Manual (Page 48)

15. APPENDIX
E: CALCULATION OF DYNACALIBRATOR H
2
S
CONCENTRATION
UNIT DEFINITIONS
mole
/ 6.02@10 23 molecules
9 10
gm
(ngm) nanogram =
PPM
v
/ 10 -6
CALCULATIONS
ume volume/vol
2 PPM
rate) flow gas (total
S) H of weight (molecular
rate) permeation (tube C)
o
25 @ ume (molar vol
=
∗
v
PPM 0.512
min
ml
7138
min
ngm
5090
mole
gm
07 . 34
mole
ltr
24.45
=






∗
∗ ∗






∗






∗










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 10
6 in the denominator that is
the definition of PPM.
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