Looking for a passive monitor sampling method that
requires no special equipment or expert knowledge?
Analytics offers the SKC-brand UMEX passive monitor
for the determination of formaldehyde in indoor air.
The monitor is chemically treated to collect formaldehyde,
with a recommended sampling time of 4 to 24 hours to
represent occupational or residential exposures.
For trailers, new buildings, etc. just place the monitor in
the living/working area of the room, at breathing zone
height. NOTE: Passive monitors require active air
circulation, and so may require the HVAC fan (or other
circulating fans) to run non-stop during sampling.
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UMEX monitors should be kept cool (refrigerator or
freezer) before and after sampling for best results. A
blank (unused) monitor should be submitted with each
sample set for use as a control. Blanks are handled and
charged the same as samples.
The DNPH-treated sampler is analyzed by High
Performance Liquid Chromatography (HPLC), the most
sensitive method currently in routine use. It should be
noted that ketones (such as acetone) and other aldehydes
can interfere with this method. Any other compounds
suspected in the sampling area should be noted on the
Chain of Custody (CoC) form.
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Ship samples by overnight courier in a cooler. Samples
collected on Fridays or weekends can ship the following
Monday.
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Below are suggested times for sampling and the
measurement sensitivity for each sampling time. These
are not the only options for formaldehyde sampling. For
more information, please contact us at 800-888-8061.
| SKC UMEX-100
(Passive Monitor) |
Sampling Times |
Passive Media
Concentration |
| 4 Hours |
20 ppb (or 0.02 ppm) |
| 8 Hours |
10 ppb (or 0.010 ppm) |
| 24 Hours |
2 ppb (or 0.002 ppm) |
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