CHEMICALDETECTION by DET
featuring novel applications of the principles of
THERMIONICSURFACE IONIZATIONand FLAME IONIZATION
-
SelectiveDetection for GC
NPD - BESTNDETECTIVITY
_ (less than 70 femtograms Nfsec)
The combination of an
Agilent
6890 NPD
and
600 femtogramsNlcotlne
a
DEl TID-4
ceramic
ion
source (bead)
TIO-4
in6690NPD
provides
state-of-the-
2 pA
f.s.
art
N-selectivity
for
tracedetectionofdrugs
of abuse, pesticides,
explosives,
and
-Nicotine
pollutants.
The
6890
NPD
.1
J,
hardware
features
a
1
J.l
concentric cylinder ion
source
-
collector
-
electrode gaomeby for \
strean'Hined gas flow
and
efficient
ion
collection. Similar DEl
equipment
is
available
tor
HP5890,
Varian 3400-3800. andSRI 8610 GCmodels.
TandemThermionic Detection for GC
COCAINE - HEROIN
T A N D.M
C-..I_IC)
NPD and
n[)..l
are
two
n o
different
modes
of
NPO(TlD-<f)
thennionic ionization.
_ ...g .
~_A
H._.... (HI
Ceramic
TlO·l
surface
.202
pAr...
opera~sat40~ln
!
a gas
environment of
u
Nitrogen or Air. TID·l is
"
,
..,
non-destructive so
it
can
TlO,'<N,",-_
be combined in series
..........
H
with
another detector like
~_A
the NPD.
.:r
Ceramic
NPD
surface
operates at 6()()..8()OCC in
\- an ignited, dilute mix of
~
Hydrogen inAir.
Sample analyzed: NPO detects both Cocaine (C)
and
Heroin (H). TIO·1 detectsHeroin andHeroin Impurity (U)
Tandem comblnaUongive••imultaneousnO.1 andNPO
signals for each sample InJec:tlon.
SelectiveDetection for GC
PHOSPHORUSCOMPOUNDS
VeryBig Signalswith aNewPTID
PesticideSample:
1-Mevinphos (P)
NP _tICI___0 _ _ ch
2-Trifluralin (N)
,
3-Simazine (N)
4-Methyl Parathion (NP)
PTIO
1 ...... , ...
NPO detects both P and
N. PTIO detects only P
i
with
signals
10
Urn••
bigger than the NPO.
r
A Phosphorus Thermionic
•
NPD
Ionization Detector (PTID)
0.04 ...... ' ...
combinessurface ionization
•
principles
with
high flows of
Hydrogen and Air for
PIC
•
selectivityof 100,000:1,PIN
•
selectivity
of
100:1,
:'"
detectivity of 70 fg P/S8C;
and a dynamic response
t"'
range more than 100,000.
-FemtogramGCDetection -
NITRO-COMPOUNDS likeTNT,
2,4-Dinitrotoluene, DNPH-A1dehydes,
Methyl Parathion, 4-Nitrophenol, etc.
Unique TlO·1 surface
ionization provides better
NPD (TID..)
selectivity thanECOand NPD.
1t2pA' .....
and needsonlyAirorN
2
as the
...
_~
detec tor
gas
with
no
,.
...
requirement forhigh purity.
TID-l
detection
I.
an
~x
inexpensive
modification
of
I~
Agi lent 6890 NPD equipment.
DET NPOm D-1 equipment
is -
also available
to
fit
HP 5890,
Tl O.1 -Nltrogen
Varian
34~3800,
and SRI
.12 pA
r.•.
8610 GCmodels.
TNT
EXPLOSJVES Sample: NPO
O.:N
"IiI
has a big response to ROX
and
4-Nltrotoluene. TIO-1
has amuch larger response
"'"""7""-
~x
,
to TNT.
-
DETector Engineering &Technology, inc.
