Performance profi le, Sampling instructions – SKC 500-100 UMEx 100 Passive Sampler for Formaldehyde User Manual
Page 2
Performance Profi le
Sampling Rate
28.6 ml/min with a relative standard deviation of 7.6% at a wind
for Formaldehyde:
velocity of 5 to 100 cm/sec for 15 minutes to 24 hours
20.4 ml/min wind velocities < 5 cm/sec for 1 to 7 days
UME
x
100 sampling rates for other aldehydes.
Validation Range:
0.06 to 3.0 ppm
Detection Principle:
Formation of stable DNPH-hydrazone in the
presence of formaldehyde*
Analysis Method:
Solvent extraction and analysis by HPLC (high-performance
liquid chromatography) with UV detection
Lower Detection Limits: 15 min: 200 ppb (.24 mg/m
3
)
8 hr: 5 ppb (.006 mg/m
3
)
24 hr: 2 ppb (.002 mg/m
3
)
7 days: 0.2 ppb (.0002 mg/m
3
)
Shelf-life:
12 mos from date of manufacture at
freezer temperatures (≤39.2 F [4 C])
Storage:
Before use: Freezer temperatures (≤39.2 F [4 C])
After use: Freezer temperatures (≤39.2 F [4 C]) and
analyze within 3 weeks
Capacity: 29
μg/sample
Accuracy:
± 25%, exceeds OSHA requirements
Temperature Effects:
No effect on sampling rate between 10 and 30 C
Humidity Effects:
No effect from 10 to 80% relative humidity (RH).
Do not use sampler below 10% RH.
Wind Velocity Effects:
No effect from 5 to 100 cm/sec
Interferences:* •
Highly
specifi c for formaldehyde. Large amounts of
carbonyl compounds may reduce the uptake of formaldehyde
• Use in ozone levels less than 0.5 ppm
Dimensions:
3.4 x 1.1 x .35 in (8.6 x 2.8 x .89 cm)
Weight:
0.38 oz (10.9 gm)
Slide Cover: Green
*
fi eld study information.
Sampling Instructions
Cautions: • Store at freezer temperatures (≤ 39.2 F [4 C]) before use.
• Do not store with food.
• SKC recommends using gloves when handling chemically
treated media.
• Before sampling, check the expiration date on the pouch label.
Do not use aft er the last day of the month indicated.
•
UME
x
samplers are designed for single use only. Do NOT reuse
UME
x
samplers.
• Do not use Sharpie
®
markers or equivalent to mark label or
pouch as these can off -gas VOCs.