Air Monitoring

Solvent Desorption Tubes and Cartridges

LpDNPH Products
ORBO™ Tubes, Coated Filters, PUF Cartridges
Custom Tubes

LpDNPH Products (ordering information) back to top

LpDNPH cartridges are air-sampling devices designated for sampling carbonyls (e.g. formaldehyde) in ambient, indoor, and industrial atmospheres. Carbonyls are trapped on a high purity silica adsorbent coated with 2,4-dinitrophenylhydrazine,where they are converted to hydrazone derivatives. The derivatives are eluted from the cartridge with acetonitrile and analyzed by HPLC.


Features & Benefits of LpDNPH cartridges:
  • High purity adsorbent for better accuracy and trace analysis.
  • High sensitivity, low background.
  • Low pressure drop, enables use at high sampling rates (1.5-2 L/min)
  • New packaging, for maximum sample integrity
  • Manufactured in controlled environment
  • Meet EPA, OSHA, NIOSH and ASTM specifications

LpDNPH Cartridge Specifications
Adsorbent:  Chromatographic grade, high purity silica gel coated with:
   DNPH: 2,4-dinitrophenylhydrazine
   BPE: trans-1,2-bis(4-pyridyl)ethylene
Particle Size:  150-250µm (60/100 mesh)
DNPH Loading:  0.29% (1mg/cartridge)
0.86% (3mg/cartridge, H series)
0.21% (0.25mg/cartridge, ORBO™-DNPH)
Bed Weight: 350mg (S10 series)
350mg (H10)
120mg (ORBO™-DNPH)
1g (H30)
10g (H300)
Capacity (total carbonyls):  75µg (S10 series)
225µg (H10)
643µg (H30)
6400µg (H300)
18.8µg (ORBO™-DNPH)
Cartridge Length:  7.4cm (S10)
3.8cm (S10x)
4.0cm (S10L)
4.0cm (Rezorian™)
9.0cm (ORBO™-DNPH)
Background:  SPE Style Cartridges
<0.06µg formaldehyde
<0.10µg acetaldehyde
<0.30µg acetone
ORBO™-DNPH
<0.025µg formaldehyde
<0.035µg acetaldehyde
<0.120µg acetone
Pressure Drop:  <7pKa at 1.5L/min <20 inches water at 167mL/min
(<28 inches water/<2.1 inches mercury)
Agency Method Applications
  US EPA TO-11A-Method for Determination of Formaldehyde in Ambient Air Using Adsorbent Cartridge Followed by High Performance Liquid Chromatography (HPLC)
  US EPA IP-6A-Determination of Formaldehyde and Other Aldehydes in Indoor Air Using a Solid Sorbent Cartridge
  US EPA-Technical Assistance Document for Sampling and Analysis of Ozone Precursors
  ASTM D5197-Standard Test Method for Determination of Formaldehyde and Other Carbonyl Compounds in Air (Active Sampler Methodology