
77-6 Environmental
• Chemiluminescence: A reactive gas is added to the sample gas. Light from the excited products of
th
e
r
eaction
i
s
d
etected
.
• UV
uorescence:
e sa
mple
ga
s
is ex
cited
wi
th
UV li
ght
an
d
th
e
su
bsequent
u
orescence
me
a-
sured
. A re
lated
te
chnique,
ph
otoionization
de
tection
(P
ID),
is to me
asure
th
e
io
nization
cu
rrent
ar
ising
fr
om
su
ch
UV ir
radiation
. i
s
th
en
de
tects
al
l
sp
ecies
wh
ose
r
st
io
nization
po
tential
is
le
ss
t
han
t
he
p
hoton
e
nergy
o
f
t
he
l
amp
.
e
t
echnique
i
s
e
xtremely
f
ast
[
12]
.
77.5 Particulate Sampling
Sampling of particulate matter in air gives rise to a dierent set of considerations from the sampling of
tr
ace