UMEx 300 Passive Sampler Cat. No. 500 Operating Instruction Form 40131 PDF

User Manual: 40131

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Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701 • www.skcinc.com

3

Passive Sampler for Ammonia
Cat. No. 500-300

The SKC UMEx 300 Passive Sampler effectively collects
ammonia at 39.92 ml/min. The UME x 300 Passive
Sampler contains a tape treated with sulfuric acid. Each
sampler incorporates a “blank/correction” section of tape
in addition to the sample section of tape. Analysis is by
ion chromatography (IC) with conductivity detection or
visible absorption spectometry for identification of ammonia
that may be present in the sample. Designed for single use, the
SKC UMEx 300 Passive Sampler is packaged in an aluminized
pouch for easy sample transport to a laboratory.

Performance Profile
Sampling Rate:

39.92 ml/min with a relative standard deviation of 11.4%

Validated
Concentration Range: 0.1 to 100 ppm
Analysis Method:

Solvent extraction and analysis of ammonium ion by
IC with conductivity detection or visible absorption
spectometry

Lower Detection
Limits:

15 min: 2.4 ppm
8 hrs: 0.075 ppm
24 hrs: 0.025 ppm

Shelf-life:

9 mos from date of manufacture at ≤ 39.2 F (4 C)

Storage:

Before use: ≤ 39.2 F (4 C)
After use: Ambient temperature (72 F [22 C]) or
≤ 39.2 F (4 C) and analyze within 3 weeks

Accuracy:

± 23.4%

Temperature Effects:

No effect on sampling rate from 22 to 40 C

Humidity Effects:

No effect from 20 to 80% relative humidity (RH)

Wind Velocity Effects: No effect from 5 to 100 cm/sec
Interferences:

None identified

Dimensions:

3.4 x 1.1 x 0.35 in (8.6 x 2.8 x 0.89 cm)

Weight:

0.38 oz (10.9 gm)

Slide Cover:

Pink

Sampling Instructions
Cautions: • Do not store with food.
• Before sampling, check the expiration date on the label on the
outside of the pouch. Do not use after the last day of the month
indicated.
• SKC recommends using gloves when handling chemically
treated media.
• UMEx samplers are designed for single use only. Do NOT reuse
UMEx samplers.
1.

Open the aluminized pouch and remove the sampler. Do not discard the pouch;
use it to send sampler to the laboratory. Store the pouch away from potential
ammonia sources.

2.

Enter date, start time, and location in the space provided on the back of the
sampler.

3.

Position the sampler on a worker’s collar for personal sampling or in an
appropriate location for area sampling.

4.

Slide the sampler cover to the “on” position to begin sampling.

5.

After sampling for the desired time, up to 24 hours, slide the sampler cover
to the “off” position to stop sampling. Enter the sample stop time in the space
provided on the back of the sampler.

6.

Place the sampler in the original pouch immediately after sampling.

7.

Seal the pouch. Send pertinent information and sample to an accredited
laboratory for analysis.

Analysis Instructions for Ammonia
Calibration Standards – Ammonium
Purchase commercially available ammonium standards appropriate for your
application. Prepare a range of ammonium standards in de-ionized ultra-filtered
(DIUF) water as outlined in Sample Preparation.
Note: The ammonium curve is not linear. A graphing program will be needed to
calculate results.

Sample Preparation for Ammonia
1.

Remove the sampler from the pouch and the sliding cover from the sampler.

2.

Use clean forceps to lift out the treated tape from each section. Place each piece
of tape in a sealed vial. This provides a sample and a blank/correction.

Note: It is also acceptable to use a “lot” blank to correct for background. One lot blank
is included in each box of badges.
Note: The blank/correction section of tape has an indentation for easy identification.
3.

Ammonium is desorbed from both the sample and the blank/correction tapes
by adding 3 ml of DIUF water to each vial. Shake the sample by hand and then
let stand for 60 minutes. Excessive shaking causes the filter to break apart in
the vial.

4.

Immediately transfer 1 ml of extract to an auto-sampler vial for analysis of
ammonia.

Ammonia Sample Analysis
1.

The sample extracts are analyzed for the ammonium ion by ion chromatography
with conductivity detection or visible absorption spectometry.

2.

A 25-microliter portion of the extract is injected onto a Dionex 3 x 250-mm CS16
column and with a 36-mM methanesulfonic acid eluent.

3.

Calculate the ammonium results by comparing against a standard calibration
curve.

4.

Convert the results from ammonium to ammonia using the following formula:
Concentration μg/ml ammonia = Concentration μg/ml ammonium x 0.944

5.

Total mass of ammonia is calculated below:
Concentration ammonia (μg/ml) x Desorption volume (3 ml)

6.

The ammonia from the blank/correction tape must always be subtracted from
the sample tape when calculating air concentrations.

7.

Calculate the air concentration in ppm using the following equations:
Time (minutes) x Sampling rate (39.92 ml/min)
1000

Concentration (ppm) =

Mass (mg) x 24450
Air volume (L) x Molecular weight (17.0 gm/mole)

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Volume of air (liters) =

Body

Reactive tape
(blank/correction)

Sliding
cover

UMEx Passive Samplers#
UMEx 300,*† for ammonia, pk/10
UMEx 100,*†‡ for formaldehyde and other aldehydes, pk/10
UMEx 200,*† for sulfur dioxide and/or nitrogen dioxide, pk/10
Accessory
Treated Tape, for QC purposes only, pk/25
Stand for Area Sampling

Cat. No.
500-300
500-100
500-200
P20083
690-302

* Limited shelf-life
† Do not store with food.
‡ Storage in a freezer at ≤39.2 F (4 C) required
#
UMEx passive samplers are designed for single use only. Do NOT reuse UMEx samplers.

SKC Limited Warranty and Return Policy
SKC products are subject to the SKC Limited Warranty and Return Policy, which provides
SKC’s sole liability and the buyer’s exclusive remedy. To view the complete SKC Limited
Warranty and Return Policy, go to http://www.skcinc.com/warranty.asp.

www.skcinc.com

Form 40131 Rev 1705
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Title                           : UMEx 300 Passive Sampler Cat. No. 500-300 Operating Instruction Form 40131 PDF Document
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