Skip to main content

UMEx 100 Passive Samplers

The UMEx 100 Passive Sampler for formaldehyde was developed in collaboration with the National Institute of Working Life in Umea, Sweden.

Constructed of tough polypropylene, the single-use UMEx 100 contains a tape treated with 2,4-dinitrophenylhydrazine (DNPH) for reliable collection of formaldehyde. Samplers are provided in individual aluminiumised pouches that can be used to transport the sampler to a laboratory after sampling.

For convenience and quality control assurance against contamination, each sampler incorporates a "blank/correction" section in addition to the active sampling section so there is no need to send extra samplers to the laboratory.

The shelf-life date is printed on a label on the outside of each pouch for easy inventory management. The UMEx 100 Sampler includes a clip for attachment to a worker’s collar for personal sampling or in an appropriate location for area sampling.

UMEx 100 Formaldehyde Passive Sampler
  • Accurate and reliable for formaldehyde collection
  • Accuracy exceeds OSHA standards
  • Uses popular 2,4-DNPH chemistry
  • Validated by OSHA and Swedish Institute
  • Economical low cost sampler
  • Easy to use - no pump or training required
  • Sample medium and blank/correction in one unit
  • Conforms to EU ISO 16000-4-2004
  • Documented uptake rates
    • For 15 minute to 24 hour samples
    • For 7 day samples*  
  • Meets specifications of OSHA Method 1007  
  • Referenced in EPA IP-6C
  • Highly sensitive and specific analysis method
  • Small and unobtrusive
  • Simple-to-use "on/off" sliding cover
  • Low 2 ppb limit of detection
  • Safe - No glass or chemical liquids in the sampler
  • 28.6 ml/min uptake rate enhances sensitivity for 15 minute, 8 hour, and 24 hour sampling*  
  • Versatile sampler - suitable for both workplace sampling and long term indoor air sampling

* Sampling periods between 24 hours and 7 days have not been evaluated
Note: If sampling in an atmosphere where Formalin is the source of Formaldehyde, please read the Technical Note under Documentation

Sampling Rate    28.6 ml/min with a RSD (Relative Standard Deviation) of 7.6% at wind velocity of 5 to 100 cm/sec for 15 minutes to 24 hours
20.4 ml/min at wind velocities < 5 cm/sec for 1 to 7 days
Detection Principle    Formation of stable DNPH-hydrazone in the presence of formaldehyde
Validation Range    0.06 to 3.0 ppm
Lower Detection Limits    15 min: 200 ppb (0.24 mg/m3)
8 hrs: 5 ppb (0.006 mg/m3)
24 hrs: 2 ppb (0.002 mg/m3)
7 days: 0.2 ppb (0.0002 mg/m3)
Shelf-life    12 months from date of manufacture at < 4°C (39.2°F)
Capacity    29 µg/sample
Analysis    Solvent extraction and analysis by HPLC (high-performance liquid chromatography) with UV detection
Accuracy    ± 25%, exceeds OSHA requirements
Storage    Before use: < 4°C (39.2°F) 
After use: < 4°C (39.2°F) and analyze within 3 weeks.
Do not store with food.
Temperature Effects    No effect on sampling rate between 10 and 30°C
Wind Effects    No effect from 5 to 100 cm/s
Interferences    Large amounts of carbonyl compounds may reduce the uptake of formaldehyde
Use in ozone levels <0.5 ppm
Dimensions    8.6 x 2.8 x 0.89 cm (3.4 x 1.1 x 0.35 inches)
Weight    10.8 g (0.38 oz)
Sampling Rates for Other Aldehydes
Compound    Sampling Rate (ml/min)
Acetaldehyde    22.8  
Benzaldehyde    13.5  
Butyraldehyde    15.8  
Crotonaldehyde    9.71  
Glutaraldehyde    14  
Hexanaldehyde    9.66  
Isovaleraldehyde    15.5  
Propionaldehyde    14  
Chloroacetaldehyde    19.4**  
Decylaldehyde    10.4**  
Heptanaldehyde    12.8**  
Nonanaldehyde    11.6**  
o-Phthalaldehyde    12.83**  
o-Tolualdehyde    12.7**  
Valeraldehyde    15.4**  

 Partial Validation
** Calculated Sampling Rate

UMEx 100 Passive Samplers
Description Pack Size Part Number
UMEx 100 Passive Sampler for Formaldehyde # and other Aldehydes.

Designed for single use only. DO NOT reuse UMEx samplers.



Treated Tape, for QC (quality control) purposes only 50 P20084

If sampling in an atmosphere where Formalin is the source of Formaldehyde, please contact SKC.
# Limited shelf-life; storage required at <4°C. Do not store with food.

Description Pack Size Part Number  
Stand for Indoor Sampling Each 690-302  690-302 Stand for mounting passive samplers for Indoor Sampling  
Shelter for Outdoor Sampling Each 690-303  690-303 Shelter for mounting passive samplers for Outdoor Sampling 
Stand for Indoor Sampling


Shelter for Outdoor Sampling


UMEX 100 Passive Sampler Instructions   Technical Note referencing passive samplers and formalin

UMEx 100


Technical Note referencing Formalin
and Passive Samplers