The invention discloses a
system for efficient self-cleaning online measurement of
active oxygen free radicals in atmospheric
particulates. The
system comprises an online atmospheric particulate collection part, a
fluorescence measurement instrument and an exhaust
assembly; the on-line atmospheric particulate collection part comprises a particulate growth chamber, a steam generator, a steam spraypipe, a plurality of liquid cooling pipes and a
cyclone collector; an atmospheric sample and
water vapor are mixed at a gas inlet of the particulate growth chamber; the inner wall of the particulate growth chamber is coated with a
cerium oxide modified nano hydrophobic
coating; an inlet of the
cyclone collector is communicated with an outlet of the particulate growth chamber; a
fluorescence determination liquid inlet is formed in the inlet of the
cyclone collector; the mixture is separated into gas and a collected liquid in the cyclone collector; the gas is exhausted through the exhaust
assembly; the collected liquid is discharged from a liquid outlet of the cyclone collector, and the collected liquid is detected by the
fluorescence measurement instrument to obtain the concentration of thereactive
oxygen free radicals in the atmospheric
particulates in the collected liquid. The
system has the advantages of high efficiency, self-cleaning, accuracy and the like.