SKC 690-101-NB, 690-102-NB, 690-103-NB, 690-104-NB User Manual

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Analysis Instructions

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Tel: [phone] Fax: [phone] e-mail: [e-mail]

ULTRA III Passive Samplers (Thermal Desorption)

Cat. Nos. 690-101, -102, -103, -104, -101-NB, -102-NB, -103-NB, -104-NB, -201, -202, -203, and -204

863 Valley View Road, Eighty Four, PA 15330 USA

Analysis

Transfer Sorbent from Sampler to Tube

1. Remove the sampler from the resealable pouch.

2. Prepare a blank thermal desorption tube (0.25-inch OD x

3.5-inch length, Perkin Elmer) by inserting a stainless steel
screen and glass wool separator in one end.

3. With the back of the sampler
facing upward and clip oriented
to the le , remove the plug from
the compartment containing
the sample sorbent (on le side,
immediately above the diff usion

Clip

holes).

4. Place the unplugged end of the
thermal desorption tube over the
compartment access port.

Thermal

desorption tube

5. Transfer the sorbent to the tube by
tipping the sampler upside down
while holding the tube in place
securely beneath the sampler.
Gently tap the sampler to remove
any remaining sorbent.

6. Remove the sampler from the tube
and place a stainless steel screen
and glass wool separator in the
unplugged end of the tube.

7. Seal the tube with PTFE caps or Swagelok

®

fi  ings.

8. Thermally desorb the sample and analyze by gas
chromatography with the detector specifi ed in the method
for the compound of interest.

9. Analyze the blank/correction sorbent, as needed, by repeating
Steps 2 through 8.

Transfer Sorbent from Vial to Tube

1. Prepare a blank thermal desorption tube (0.25-inch OD
x 3.5-inch length, Perkin Elmer) by inserting a stainless steel
screen and glass wool separator in one end.

2. Remove the cap from the vial.

3. Fit the tapered end of the Transfer
Funnel accessory (Cat. No. 590-

264) onto the end of the prepared
thermal desorption tube.

Plug

Sample sorbent

compartment

Sliding cover

Access port

(sample sorbent

compartment)

4. Align the mouth of the open vial
with the wide part of the funnel.
Carefully pour the sorbent from
the vial into the thermal desorption
tube. Gently tap the vial on the
rim of the funnel to remove any
remaining sorbent.

5. Once the sorbent transfer is complete, remove the funnel from
the tube. Place a stainless steel screen and glass wool separator
in the open end of the tube to secure the sorbent.

6. Seal the tube with the PTFE caps or Swagelok fi  ings.

7. Thermally desorb the sample and analyze by gas
chromatography with the detector specifi ed in the method
for the compound of interest.

8. Analyze the blank/correction sorbent, as needed, by repeating
Steps 1 through 7.

Calculations

[(SW) - (BW)] (24.45 x 106)
C =
(DE) (MW) (SR) (MIN) (PT)

Where:
C = Concentration of chemical (ppb)
SW = Sample weight by analysis (μg)
BW = Analyte weight in blank (μg)
PT = Pressure/temperature correction (see below)
DE = Desorption effi ciency (see below)
MW = Molecular weight of chemical
SR = Sampling rate (ml/min) - available at www.skcinc.com/

PassiveGuide/default.asp

MIN = Sampling time (minutes)

The equation above is correct for 25 C (298 K) and standard atmospheric
pressure (760 mm Hg). To convert to other temperatures and pressures,
the correction factor is:

PT = (T1/T2)

Where:
T

= Sampling site temperature (in Kelvin)

1

T

= 298 K

2

P

= Sampling site pressure (in mm Hg)

1

P

= 760 mm Hg

2

In most cases, desorption effi ciency should be 100% and expressed
as a decimal (e.g., 100% = 1.0).

For sampling rates, go to www.skcinc.com/PassiveGuide/
default.asp.

1.5

(P2/P1)

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 h p://www.skcinc.com/warranty.asp.

Form 40125 Rev 1306