SKC 226-120 User Manual

Operating Instructions

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863 Valley View Road, Eighty Four, PA 15330 USA

Certifi cate of Quality

Cat. No. 226-120

Sorbent: Silica Gel coated with
2,4-Dinitrophenylhydrazine with
potassium iodide ozone scrubber

Tube Holder: Type D

Storage: Store at ≤ 39.2 F (4 C) before use.
After sampling, store at ≤ 39.2 F (4 C).
Expedite shipping of samples to the laboratory.
Friday shipments are not recommended.

SKC is an ISO 9001 registered

manufacturing company.

For compliance sampling, use these tubes as specifi ed in a validated sampling method. It is the user’s
responsibility, employing a suitable method, to establish appropriate safety and health practices and
to determine the applicability of regulatory limitations before use. The user should adjust the sampling
procedures to specifi c conditions and should test tubes to ensure that the desired results will be obtained.

The SKC Certifi cate of Quality assures that these sorbent tubes have been manufactured to meet or
exceed the requirements for sorbent purity, sample collection and retention, storage stability, and
desorption effi ciency for the following chemical hazards and analytical methods published by NIOSH,
OSHA, EPA, or ASTM:

Acetone ASTM D5197
Aldehydes ASTM D5197
Formaldehyde ASTM D5197
Formaldehyde EPA IP-6A
Formaldehyde EPA TO-11A
Hexanaldehyde (hexanal) ASTM D5197

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.

Sorbent Sample Tube

Cat. No. 226-120

Description

Sorbent sample tube Cat. No. 226-120 is a three-section tube containing 300 and
150 mg of DNPH-coated silica gel, respectively (sample section and backup section
to detect breakthrough), and a 1500 mg section of potassium iodide that acts as an
ozone scrubber.

Sampling

The 226-120 sorbent sample tube can be used at fl ow rates up to 1 L/min. For
additional sampling parameters, consult the method used. Sampling parameters
may vary with ambient concentrations of the analyte.

This sorbent tube is not recommended for the collection of acrolein due to
numerous problems reported with the instability of the acrolein-DNPH derivative
during collection and storage.

Sampling Notes

Ozone: Ozone interference is associated with DNPH-coated adsorbent tubes.
Sorbent sample tube Cat. No. 226-120 contains a built-in ozone scrubber that may
be used in atmospheres where ozone is present to help eliminate this interference.

Acetonitrile: The sorbent inside these tubes contains a small amount of residual
acetonitrile used in processing the sorbent. Acetonitrile may off-gas during
sampling; therefore, exposure monitoring for acetonitrile should not be performed
concurrently when these sorbent tubes are in use.

Background

See Certifi cates of Analysis by browsing www.skcinc.com/certifi cates.asp and
scrolling to Silica Gel, DNPH Treated, High Purity. Select the Lot Number that
matches the Lot Number printed on the tube.

Preparing Formaldehyde Samples for Analysis

1. Place each sorbent section into separate glass vials. Discard the ozone scrubber
section according to state and federal guidelines.

2. Add 3 ml of acetonitrile to each vial. Cap each vial.

3. Shake each vial periodically over a 30-minute period.

4. Analyze sample extracts by HPLC with UV detection at 365 nm.

Form 37356 Rev 1305