Assessment of a modified cascade centripeter.
The cascade centripeter of Hounam and Sherwood was modified to permit a wider selection of filters for use in stages 1 to 3. Tests with monodisperse aerosols showed that the calibration given by O'Connor adequately describes the modified device. An iterative procedure was devised which provides more detailed particle size data than is possible with conventional data analysis. In tests sampling urban aerosol, it was found that the centripeter is a practical alternative to the cascade impactor. Using filters selected for low and stable tare weight, a sample sufficient for weighing can be obtained in 4 to 6 hours. The main advantage of the centripeter is that the size-classified samples are obtained as uniform deposits on clean, dry filters.
D000388:Air / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis; D004391:Dust / Q000032:analysis*; D005069:Evaluation Studies as Topic; D005374:Filtration / Q000295:instrumentation* / Q000379:methods; D010316:Particle Size; D013997:Time Factors
D000396:Air Pollutants, Radioactive; D004391:Dust