DETector Engineering &Technology, inc.
486
NorthWiget Lane
DET REPORT
Walnut Creek, CA
94598·2408
USA
Phone:
925·937-4203;
FAX:
925-937-7581
No.63 JUNE
2011
e-mail :
DETCeramic Ion Sources After 6 Plus Years Storage In Lab Drawer
30 pg Atrazine (A) and Chlorpyrifos (C)
6890 NPD Equipment - all data at 16 pA full scale
TID-4 made 3;2000
TID-2 made 8/1996
returned from user
1500 hrs prior use
10/2002
heat=2.13 A
heat=2.58 A
hyd.-5.0
hyd."3.0
bkg.=14 pA
bkg.=15 pA
c
A
c
TID-2 made 4/2001
no prior use
heat=2.77 A
hyd.=2.0
bkg.-24 pA
c
A
Figure 9. Demonstration that DETceramic ion sources have unlimited shelf life.
NPDDetection of 12 pg Malathion (M)
Agllent 6890GC
-M
TID-2 _hlte ceramic
originally sold 4192
old DET Ion source
4pA full scale
re-acqulred 7109
bead V-2.800
background-7.1pA
-M
4pA full acale
Agllent Bios glaaa
Ion .oure.
70 hours prior uae
bead V-0.640
background-4.6pA
Figure
10.
Figure 10 is an ultimate example of durabilityof aDET
Ceramic Ion Source versus time. This NP ion source
was originally manufactured in 1992. It was used for
some time inaDET retrofit NPD on an HP 5890GC by
an end user ina tobaccocompany.TheGC equipment
was subsequentlysold as surplus to a used equipment
dealer. A newend userpurchased the DETdetector in
2009, and returned it toDET for refurbishment. The ion
source had a frayed cable, but the ceramic surface
was intact. When the well worn ion source was
installed into an Agilent 6890 NPD, the data shown
here indicated that its detectivity for low picogram
amounts of Malthion was comparable to a recent
Agilent "Bios" glass ion source.
DRUGSOF ABUSE
• Methamphetamine (Speed)
NPD 256
pAlmV
TID-4 Ion source:
h••t-2.65
AI
poa.rizlltion- 5V
detector gases:
hydrogen-3, air-50, nitrogen-tOmUmln
Cocaine
leroin
3,4-MDMA (Ecstacy)
I
Heroin
TID-1 64
pAlmV
TID-1 Ion source:
heat-2.40 A, polarlzatlon- ...45 V
detector gases:
nitrogen-55, al..-5mUmln
Figure
11.
Data from anewTID-4 ion source that storedon
the shelf for 5 years prior to these data. The responsewas
comparable to a freshly made new ion source. Note also
how the selectivity of detection was easily changed to
another mode by changing the type of ion source and the
detector gases.
6
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E-nmail :
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