Sioutas Cascade Impactor
Samples Coarse, Fine, and Ultrafine Particles
Precise particle separation
- 50% cut-points: 2.5 µm, 1.0 µm, 0.50 µm, and
0.25 µm
- The only personal-size impactor that efficiently samples coarse,
fine, and ultrafine particles
- Maintains high collection efficiency even at high particle concentrations
Optimized at 9 L/min flow rate
- Maintains specified 50% cut-points
- Maximizes analytical sensitivity
- Minimizes non-detectable samples
Preserves unstable compounds
- Chemically inert collection substrate
- No impaction grease to contaminate sample
Minimal particle bounce and internal wall losses
Suitable for indoor and outdoor ambient sampling
Size-fractionated samples can be analyzed gravimetrically,
chemically, and microscopically
Small and lightweight
- Suitable for personal or area sampling
- 5.6 oz (159 gm)
Sioutas
Cascade Impactor Operating
Instructions (PDF)
Sioutas
Cascade Impactor Spec. Sheet (PDF)
EPA
IP-10A Method Update: Determination of Fine Particulate Matter
in Indoor Air Using Size-Specific Impaction (PDF)
Sioutas Cascade Impactor
The patented† personal-size
Sioutas* Cascade Impactor
separates and collects airborne particles in five size ranges: > 2.5 µm,
1.0 to 2.5 µm, 0.50 to 1.0 µm, 0.25 to 0.50 µm,
and < 0.25 µm. When used with PTFE (Teflon)• collection filters, the Sioutas Impactor is highly efficient at collecting
particles
without the use of impaction grease or substrate coatings and at
retaining unstable compounds for size-fractionated chemical analysis.
| † |
Patented by the University of Southern California |
| * |
Developed
by Dr. Constantinos Sioutas of the University of Southern
California in partnership with the Mickey Leland National
Urban Air Toxics Research Center (NUATRC). See reference
below. |
| • |
Back
pressure on PTFE (Teflon) filters can vary within the same
lot. |
Sioutas Impactor and Leland Legacy Pump are Powerful Partners
| The Sioutas Impactor and SKC Leland Legacy Sample
Pump operated at 9 L/min are powerful partners that ensure precise
particle
separation at the specified cut-points and sample collection
on the filters at each stage. The Sioutas Impactor is simply
clipped to a worker's collar or lapel for personal sampling or
attached at a sampling site for area sampling. |
 |
 Sioutas Impactor and Leland Legacy Receive
ETV Verification
U.S. EPA Environmental Technology Verification (EPA-ETV) is a
program that furthers environmental protection by accelerating
acceptance and use of improved, cost-effective
technologies through performance verification. EPA-ETV recently tested the SKC
Leland Legacy Sample Pump with the Sioutas Impactor and released its report.
For a verification report on the Leland Legacy and Sioutas performance, visit
the AMS Center at www.epa.gov/nrmrl/std/etv/vtams.html |
Why Use the Sioutas Personal Impactor?
PM2.5 (fine particulate matter) has been linked to an increase in
respiratory symptoms and related hospital visits, aggravated asthma,
chronic bronchitis, and premature death. Indoor concentrations of
PM are often higher than outdoor concentrations. Studies show that
the traditional stationary monitors used for ambient PM measurement
are poor estimators of personal PM exposures; they do not assess
the effects of PM on vulnerable individuals. The new approach to
sampling fine PM includes:
- Sampling of microenvironments, i.e., personal sampling
- Sampling of vulnerable persons
- Measuring the mass of exposure
- Measuring particle size
- Evaluating particle chemistry
Only the new miniature Sioutas Cascade Impactor meets the new approach to sampling fine PM. The Sioutas Impactor collects personal samples and separates the sample into five size ranges that can be analyzed for particle mass exposure, particle size, and particle chemistry. Analysis of Sioutas Impactor samples can provide data on the relationship between outdoor/indoor PM levels and personal exposures.
Sioutas Impactor Applications
- Industrial hygiene studies
- Indoor Air Quality (IAQ) studies
- Air pollution studies
- Inhalation toxicology and epidemiological studies
- Aerosol research
- Pharmaceutical studies
- Outdoor ambient sampling
Performance Profile
| Flow rate |
9 L/min
50% cut-point of each stage at 9 L/min
Stage A: 2.5 µm
Stage B: 1.0 µm
Stage C: 0.50 µm
Stage D: 0.25 µm |
| Recommended after-filter type |
37-mm, 2.0-µm PTFE (Teflon) filter•†
(Cat. No. 225-1709)
|
| Recommended collection filter |
25-mm, 0.5-µm PTFE (Teflon) with laminated PTFE support
(Cat. No. 225-2708)•
|
| Alternative collection filter |
25-mm, 3.0-µm PTFE (Teflon) with
PMP support ring•†
(Cat. No. 225-1711) |
| Wind velocity |
< 5 mph |
| Maximum particle load |
Varies per stage ‡ |
| Construction material |
Stages are anodized aluminum;
O-rings are Buna-N (Nitrile); filter retainers are acrylic |
| Inlet and outlet diameters |
Inlet: 3/8-in OD and 1/4-in ID
Outlet: 3/8-in OD and 1/4-in ID |
| Dimensions |
3.4 x 2.2 in (86 x 55 mm) |
| Weight |
5.6 oz (159 gm) |
Sioutas FAQs
Filters for the Sioutas Impactor
Four 25-mm filters and one 37-mm filter are required for sampling
the fractions specified. The 25-mm filters act as collection substrate
and the 37-mm filter is the final collection filter (after-filter)
for particles below 0.25 µm. SKC recommends using PTFE (Teflon)
filters• in the Sioutas Impactor to
minimize particle bounce and to preserve unstable compounds. Coated
collection substrate may be used
if desired, however, a coating is not necessary and can interfere
with chemical analysis. See Ordering Information for
recommended filters.
• Back
pressure on PTFE (Teflon) filters can vary within the same lot.
Ordering Information
| Description |
Cat. No. |
| Sioutas Impactor |
 |
225-370 |
| Accessories |
Cat. No. |
Leland Legacy Pump with
Li-Ion battery pack,
Use in non-explosive
environments only; not UL Listed for intrinsic safety; CE marked Requires
charger and special shipping see Leland Legacy Pump page
for more information |
 |
100-3002 |
| Defender
510 Primary Standard Calibrator, Includes
lead-acid battery, multi-plug charger (100-240 V), Optimizer
Collect Light Software, and 39-in (1-m)
serial cable. Software requires Windows 2000 (SP3), XP (SP2),
or Vista and available COM port. |
 |
717-510H |
| Sioutas Replacement Parts |
Cat. No. |
| Replacement Collector Plates, set of 4 |
P55016 |
| Retainer Rings only, pk/4 |
P20151 |
| Replacement O-ring, Retainer, and Spacer
Set for Sioutas Impactor includes 4 filter retainer
rings, 9 O-rings, and 1 PTFE (Teflon) spacer ring |
P51917 |
| Filters for Sioutas Impactor |
Cat. No. |
| After-filter, 37-mm
PTFE (Teflon)•†,
2.0 µm (optional) |
225-1709 |
| Collection Filters,
25-mm, PTFE
(Teflon)•, 0.5 µm |
225-2708 |
| Impaction Filters (Alternative),
25-mm, PTFE (Teflon)•†,
3.0 µm |
225-1711 |
| • |
Back pressure
on PTFE (Teflon) filters can vary within the same lot. |
| † |
The maximum operating temperature for PTFE
(Teflon) filters with PMP
support ring is 464 F (240 C). |
Reference:
Misra, C., Singh, M., Shen, S., Sioutas, C., Hall, P., "Development and
Evaluation of a Personal Cascade Impactor Sampler (PCIS)," Journal of
Aerosol Science, 33, 2002, pp. 1027-1047.
Singh, M., Misra, C., Sioutas, C., "Field Evaluation of a
Personal Cascade Impactor Sampler (PCIS)," Atmospheric Environment,
37, 2003, pp. 4781-4793.
Sioutas, C., "Development of New Generation Personal Monitors
for Fine Particulate Matter (PM) and its Metal Content," NUATRC
Research Report No 2, 2004, http://www.sph.uth.tmc.edu/mleland/attachments/MLeland_Sioutas2.pdf.
Sioutas
Cascade Impactor Operating Instructions (PDF)
Sioutas
Cascade Impactor Spec. Sheet (PDF)
EPA
IP-10A Method Update: Determination of Fine Particulate Matter
in Indoor Air Using Size-Specific Impaction (PDF)
This page was last modified May 11, 2009
