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Systematic laboratory experiments were performed to investigatequantification of various species with two versions of the Aerodyne AerosolMass Spectrometer, a Quadrupole Aerosol Mass Spectrometer (Q-AMS) and acompact Time-of-Flight Aerosol Mass Spectrometer (c-ToF-AMS). Here wepresent a new method to continuously determine the detection limits of theAMS analyzers during regular measurements, yielding detection limit (DL)information under various measurement conditions. Minimum detection limitsrange from 0.03 μg m−3 (nitrate, sulfate, and chloride) up to 0.5 μg m−3(organics) for the Q-AMS. Those of the c-ToF-AMS are foundbetween 0.003 μg m−3 (nitrate, sulfate) and 0.03 μg m−3(ammonium, organics). The DL values found for the c-ToF-AMS were ~10times lower than those of the Q-AMS, mainly due to differences in ion dutycycle. Effects causing an increase of the detection limits include long-terminstrument contamination, measurement of high aerosol mass concentrationsand short-term instrument history. The self-cleaning processes which reducethe instrument background after measurement of large aerosol concentrationsas well as the influences of increased instrument background on massconcentration measurements are discussed. Finally, improvement of detectionlimits by extension of averaging time intervals, selected or reduced ionmonitoring, and variation of particle-to-background measurement ratio areinvestigated

Aerosol quantification with the Aerodyne Aerosol Mass Spectrometer: detection limits and ionizer background effects