SKC 690-105 User Manual

Analysis Instructions

ULTRA III Passive Samplers with or without Blank,

Containing Charcoal Sorbent (Solvent Extraction)

Cat. No. 690-105, 690-105-NB, or 690-205

Analysis

1. a. For Cat. No. 690-105 or 690-105-NB (prefilled sampler):

Remove
to Step 2.

b. For Cat. No. 690-205 (sorbent in vial): Remove

vial and proceed to Step 4.

2. Lay the sampler on a fl at surface with the back of the sampler
facing upward.

3. With the clip oriented to the le , remove the plug from the
compartment containing the sample sorbent (on left side,
immediately above the diff usion holes).

the

sampler from

Plug

the

resealable pouch and proceed

the

lid from

Sample sorbent compartment

(plug removed)

the

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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)
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:

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Blank/correction sorbent

compartment (plug in place)

Clip

Sliding cover

(690-105-NB)

4. Hold the sampler or vial over a 3.7-ml glass vial. Use a larger
vial if using more than 2 ml of solvent.

5. Transfer the sorbent to a 3.7-ml or larger vial by tipping the
sampler or vial upside down over the vial. Gently tap to remove
any remaining sorbent.

6. Add typically 2 ml of desorption solvent to the sorbent in
the vial.

Add the solvent slowly.

7. Shake the sorbent for 30 minutes.

8. Analyze the sample 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 for the sampler and Steps 1 and 4 through 8
for the sorbent vial.

PT = (T

1/T2

1.5

)

(P2/P1)

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

Desorption effi ciency should be determined and expressed as a
decimal (e.g., 98% = 0.98).

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

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 40127 Rev 1306