On the Calibration of Cascade Impactors

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Abstract
The two customary methods of calibrating cascade impactors are compared. It is shown that the method of determining collection efficiency as a function of particle size for each stage provides information for interpreting results in terms of impactor theory, making it possible to establish adequate jet performance. Two criteria are suggested for expressing impactor performance; the root inertial parameter, √ ψ, for which collection efficiency equals 0–5 and the slope of the straight portion of the efficiency curve. It is also shown that calibration in terms of the mass median diameter can lead to serious misinterpretation of results. The former method of calibration is shown to be generally preferable for the interpretation of data obtained from sampling unknown aerosols, but both methods have shortcomings which suggest the need for a more refined method of interpretation.

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