NPD
- Nitrogen-Phosphorus Detector
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Very Selective
to Nitrogen and Phophorus
- Detects down to 100ppb
- Exceptionally rugged NPD bead
- Similar in design to the SRI FID
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The
SRI ceramic NPD bead is exceptionally rugged and long-lasting, offering
service from 100 to 1000 hours, depending on operating conditions.
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The Nitrogen-Phosphorus
Detector responds to nitrogen-phosphorus compounds about 100,000 times
more strongly than normal hydrocarbons. Due to this high degree of selectivity,
the NPD is commonly used to detect pesticides, herbicides, and drugs of
abuse.
The NPD is similar
in design to the FID, except that the hydrogen flow rate is reduced to
about 3mLs/minute, and an electrically heated thermionic bead (NPD bead)
is positioned near the orifice. Nitrogen or phosphorus containing molecules
exiting the column collide with the hot bead and undergo a catalytic surface
chemistry reaction. The resulting ions are attrtacted to a collector electrode,
amplified, and output to the data system.
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This
chromatogram shows the NPD response to a 10ppm malathion sample. |
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NPD/DELCD
Combination Detector
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Ideal for
Pesticide Screening
- NPD detects Organo-phosphorus (OPP)
- DELCD detects Chlorinated species
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The
NPD/DELCD combination detector is ideal for pesticide screening. The
NPD selectively responds to the organo-phosphorus pesticides, while
the DELCD detects only the chlorinated species. |
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These two chromatograms
show an analysis of 200ppb O-Cl and O-P pesticides. The NPD sees the
phosphorus, while the DELCD sees the chlorine. |
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8690-0015
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NPD
detector
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£2,728.00
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8690-2615
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NPD/DELCD
combination detector
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£5,448.00
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NPD
- Nitrogen-Phosphorus Detector |
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