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Sioutas Cascade Impactor

Samples Coarse, Fine, and Ultrafine Particles

Sioutas Cascade Impactor Cat No. 225-370 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 ® Pump

ETV LogoSioutas 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)
 
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).
See NUATRC Report No. 2 at http://www.sph.uth.tmc.edu/mleland/attachments/MLeland_Sioutas2.pdf

 

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. Defender 510 calibrater 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
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