SKC 690-101-NB,-102-NB,-103-NB,-104-NB ULTRA III Passive Samplers without Blank Analysis Instructions - Manual

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
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 left , remove the plug from
the compartment containing
the sample sorbent (on left side,
immediately above the diff usion
holes).
4. Place the unplugged end of the
thermal desorption tube over the
compartment access port.
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 tt 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.
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Form 40125 Rev 1306
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Sample sorbent
compartment
Plug
Sliding cover
Clip
Thermal
desorption tube
Access port
(sample sorbent
compartment)
Analysis Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701 Fax: 724-941-1369 e-mail: [email protected]
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 tt 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 10 6 )
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 = (T
1
/ T
2
) 1.5 (P
2
/ P
1
)
Where:
T
1
= Sampling site temperature (in Kelvin)
T
2
= 298 K
P
1
= Sampling site pressure (in mm Hg)
P
2
= 760 mm Hg
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.
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