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ISO-CHEK
Simultaneous and Separate Collection of Isocyanate Phases

- Accurately samples diisocyanates: HDI, MDI, IPDI,
HMDI, 2,4-TDI, and 2,6-TDI
- The only filter-based system that
simultaneously traps and separates both
monomers and oligomers
- For better determination of control strategies
- Decreases sample preparation and analysis time
by 40% compared to other methods
- Pre-made calibration standards are available
- Highly stable — minimizes storage and handling
- Highly sensitive analysis provides detection limits
below current regulated exposure levels
- Ideal for occupational sampling and environmental surveys
- Requires only a 15-minute sample time
- Round-robin proficiency testing for ISO-CHEK-certified laboratories* ensures
accurate, consistent analysis
- Meets the specifications of several methods
- ASTM D5932-96 2,4, 2,6-TDI (monomer)
- ASTM D6561-00 HDI (aerosol oligomer), the only U.S. standard for oligomers
- ASTM D6562-00 HDI (gaseous monomer)
ISO-CHEK
Isocyanate Sampling System Product Data Bulletin (PDF)
The patented (U.S. Patent No. 4,961,916) ISO-CHEK® Isocyanate
Sampling System is a preloaded three-piece cassette that contains
two stages. Stage one contains an untreated PTFE (Teflon®) filter to
collect the aerosol phase and stage two holds a glass fiber filter
impregnated with 9-(N-methylaminomethyl) anthracene (MAMA)
for the vapor phase of isocyanates.
This system effectively traps and separates the phases at the point
of collection and offers many advantages over other methods for sampling
isocyanates.
The ISO-CHEK Advantage!
Simultaneous collection and separation of phases at the point
of collection: ISO-CHEK
separates the vapor and aerosol phases at the point of collection
for less time-consuming and more accurate analysis of each phase.
Reagent is stable at room temperature: Loss of
derivatizing reagent was found under ambient conditions
when using other methods.
15-minute sampling time: Isocyanates are sensitizing
agents. Even short 15-minute exposures at high concentrations can lead to
sensitivity in susceptible individuals.
Therefore, short-term sampling provides more meaningful results than the
longer sampling times required by other methods.
No handling precautions: no broken glass or splashing impinger
liquid
Exploded View of ISO-CHEK filter Cassette
(Cassette in image is
tinted for clarification)
Principle of Operation
A sample pump draws air through the ISO-CHEK cassette.
Aerosols are trapped on the PTFE filter while gases pass through
to the next
filter. Vapors are trapped on the fiber glass filter impregnated
with MAMA. A chemical reaction occurs on this filter resulting in
the formation
of a highly detectable urea derivative. The PTFE filter is derivatized
in the field by placing it in a supplied jar containing 1-(2 Methoxy
phenyl) piperazine reagent (MOPIP). Monomeric and oligomeric phases
are
separated by using a reverse phase HPLC column with a UV detector
and fluorescence
detector in series.
Using ISO-CHEK
Simply unplug and connect the cassette to a calibrated
sample pump capable of at least 1 L/min. Take a 15-minute sample
at 1 L/min.
Immediately after sampling, open the cassette, remove the PTFE filter
with forceps,
match the cassette ID number with the reagent jar number, and place
the filter in the prepared reagent jar. The fiber glass filter remains
in the cassette. Replug the cassette, wrap it in foil to protect
the sample from light, and ship the jar and cassette to an ISO-CHEK-certified
laboratory *.
Performance Profile
| Collection Method |
Dual filter cassette; 5-(m PTFE membrane traps aerosol phase, glass fiber filter impregnated with MAMA collects vapor phase |
| Sample Flow Rate |
1 L/min |
| Sample Time |
15 minutes |
Derivatizing Reagent
(filter coating for vapor phase) |
9-(N-methylaminomethyl) anthracene (MAMA) |
| Reagent Stability |
10 months at ambient temperature |
Derivatizing Solution
(for aerosol phase) |
1-(2-Methoxyphenyl) piperazine (MOPIP) |
| Sample Stability |
Can be stored at 39.2 F (4 C) for up to 10 days. SKC recommends
sample analysis as soon as possible. |
| Analysis |
Reverse phase HPLC with UV and fluorescence detection |
| Quantitation Limit |
0.15 ppb for 2,4-TDI, 2,6-TDI, 1,6-HDI, IPDI, MDI, HMDI monomer
1.5 ppb for 1,6-HDI and MDI oligomers |
| Limit of Detection |
0.2 mg/m3 for 2,4-TDI and 2,6-TDI
0.6 mg/m3 for 1,6-HDI
0.3 (UV)/0.08 (FD) mg/m3 ** for MDI |
| ** |
First number is with UV detector, the second is with a fluorescence
detector |
Technical
Note Comparison of ISO-CHEK Method Parameters and Reagent Stability (PDF)
Ordering Information Online
Ordering
| Description |
Quantity |
Cat. No. |
ISO-CHEK* Sampling
System, preloaded clear cassettes for isocyanates
Limited shelf life
ISO-CHEK cassettes require derivatizing solution
(see below) and Sure-Seal Cassette Opener 225-13-5A
|
12 |
225-9022 |
| 36 |
225-9022A |
ISO-CHEK* Sampling
System with Derivatizing Reagent‡ preloaded
clear cassettes and jars of derivatizing solution (MOPIP)
Limited shelf life
ISO-CHEK cassettes require Sure-Seal Cassette Opener 225-13-5A |
4 |
225-9023 |
| 10 |
225-9023A |
Derivatizing Solution* ‡ , 1-(2
Methoxy phenyl) piperazine reagent (MOPIP), in jars
Limited shelf life |
12 jars |
225-9050 |
Sure-Seal Cassette Opener,
stainless steel, opens 25 and 37-mm cassettes
(included in Filter Handling Kit 225-8372)
Required
for ISO-CHEK cassettes
|
|
1 |
225-13-5A |
| Jars, glass with PTFE-lined
caps, for solvent extraction of filters |
|
8 |
225-8376 |
| 36 |
225-8377 |
ISO-CHEK Calibration Standard
Set, calibration
standards for HDI, MDI, IPDI, 2,4-TDI, and 2,6-TDI, 1 gram each
Limited shelf life. Freezer storage recommended.
Does NOT require refrigerated shipping.
Other
ISO-CHEK standards are available. Contact SKC. |
set |
225-9055 |
ISO-CHEK Calibration Standard, MAMA-HMDI, 1
gram
Limited shelf life. Freezer storage recommended.
Does NOT require refrigerated shipping.
Other ISO-CHEK standards are available. Contact SKC. |
1 |
225-9056 |
ISO-CHEK Calibration Standard, MAMA-2,4
TDI and 2,6 TDI, 1 gram
Limited shelf life. Freezer storage recommended.
Does NOT require refrigerated shipping.
Other ISO-CHEK standards are available. Contact SKC. |
1 |
225-9052 |
ISO-CHEK Calibration Standard, MAMA-HDI, 1 gram
Limited shelf life. Freezer storage recommended.
Does NOT require refrigerated shipping.
Other ISO-CHEK standards are available. Contact SKC. |
1 |
225-9053 |
ISO-CHEK Calibration Standard,
MAMA-IPDI, 1 gram
Limited shelf life. Freezer storage recommended.
Does NOT require refrigerated shipping.
Other ISO-CHEK standards are available. Contact SKC. |
1 |
225-9054 |
ISO-CHEK Calibration Standard,
MAMA-MDI, 1 gram
Limited shelf life. Freezer storage recommended.
Does NOT require refrigerated shipping.
Other ISO-CHEK standards are available. Contact SKC. |
1 |
225-9062 |
| ISO-CHEK Packaging Kit, provides
shipping material to make 10 packaging kits each holding 10 samplers
and derivatizing solution jars |
1 |
225-9059 |
| ISO-CHEK Packaging Kit includes
shipping material to make 20 packages each holding 4 ISO-CHEK
samplers and 4 derivatizing solution jars |
1 |
225-9063 |
| * |
ISO-CHEK cassettes must be analyzed by an ISO-CHEK-certified
laboratory. For a lab list see the SKC
ISO-CHEK Cassettes Laboratory Reference List.
|
| ‡ |
Hazmat shipping charges for air shipments only, ground shipments
exempt; not available for export
|
| † |
IRSST (Institut de recherche Robert-Sauveé en santé et
en sécurité du
travail du Québec) |
ISO-CHEK
Isocyanate Sampling System Product Data Bulletin (PDF)
Material Safety Data Sheets
MSDS — MOPIP
1-(2-Methoxyphenyl) Piperazine (PDF)
MSDS — MAMA
9-(Methylaminomethyl) Anthracene (PDF)
MSDS — Toluene
(PDF)
® ISO-CHEK is a registered trademark of Omega Specialty
Instrument Co.
This page was last modified March 8, 2010
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