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15. APPENDIX E: CALCULATION OF DYNACALIBRATOR H
2
S
CONCENTRATION
UNIT DEFINITIONS
mole / 6.02@10
23
molecules
9
10
g
m
(ngm) nanogram =
PPM
v
/ 10
-6
CALCULATIONS
umevolume/vol
2
PPM
rate)flow gas (total
S) Hof weight (molecular
rate) permeation (tube C)
o
25 @ ume(molar vol
=
∗
v PPM0.512
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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