SKC 575 Series Passive Samplers for Organic Vapors - Manual (Page 3)

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Storage
Before use: Store at ambient temperature. For low-level measurements, SKC
recommends storage at < 39.2 F (4 C) for lower backgrounds and
optimum results.
Aft er use: For sample storage information, refer to the method for the
chemical of interest. SKC recommends expedited shipment of
samples due to the unstable nature of some compounds.
Analysis
Solvent desorption, Gas Chromatography/Flame Ionization Detector (GC/FID)
See Analysis Instructions online at www.skcinc.com/instructions/37009.pdf.
A listing of AIHA-accredited laboratories analyzing SKC 575 Series Passive Samplers is
available at www.skcinc.com. Click on Laboratories.
Validation
SKC 575 Series Passive Samplers for organic vapors have been validated to the
rigorous NIOSH and ANSI testing protocols.
Full - Passed all NIOSH Partial validation protocol and factorial study,
including interfering compounds; most rigorous test; includes all
parameters aff ecting sampling accuracy
Bi-level - A key member of a homologous series passed Full validation,
all others passed Partial. Validity shown by Guild et. al. (see References).
Partial - Passed NIOSH protocol for sampling rate, desorption
effi
ciency, humidity eff ects, reverse diff usion, and storage stability
(reactive compounds).
Calculated - Uptake Rate - D x (A/L). “D” is a diff usion coeffi cient
calculated from the Hierschfelder Equation. “A/L” is a constant based on
the geometry of the sampler.
For compliance sampling, it is recommended that only those passive samplers
with agency, Full, or Bi-level validation be used. Passive samplers with lower
validation levels should be used only if verifi ed by sorbent tube methods.
References
Cassinelli, M.E., Hull, R.D., Crable, J.V. and Teass, A.W., “Diff usive Sampling: An Alternative
to Workplace Air Monitoring,” A. Berlin, R.H. Brown and K.J. Saunders (Royal Society of
Chemistry, London) (eds.), NIOSH Protocol for the Evaluation of Passive Monitors, 1987, pp.
190-202
Guild, L.V., Myrmel, K.H., Myers, G. and Dietrich, D.F., “Bi-Level Passive Monitor Validation:
A Reliable Way of Assuring Sampling Accuracy for a Larger Number of Related Chemical
Hazards” Appl. Occup. Environ. Hyg., Vol. 7, No. 5, May 1992, pp. 310-317. Reprints available
from SKC.
SKC 575 Passive Sampler Validation (Research) Reports. Available at www.skcinc.com. Click
on Downloads and search.