The invention discloses a purging and
trapping device of VOCs (volatile
organic chemicals) in water and a purging and
trapping method using the purging and
trapping device. The purging and trapping device comprises a
mixed gas carrying gas inlet, a purging
pipe, a pure gas carrying gas inlet, a
dehydration device, a
cyclone separator and an enrichment separation device, wherein the
mixed gas carrying gas inlet is connected with one end of the purging
pipe; the other end of the purging
pipe is connected with a
water sample inlet and outlet and a purging gas outlet and is connected with the puregas carrying gas inlet and the
dehydration device through a three-way valve; the
cyclone separator is arranged between the
dehydration device and the enrichment separation device; the
tail end of theenrichment separation device is connected with a
detector. The purging and trapping device has the advantages that the purging and trapping efficiency can be improved; the gas carrying consumption isreduced; the time is shortened. The
mixed gas is used for purging, the
mass transferring speed of the VOCs between liquid and gas is accelerated; the purging and trapping rate on the VOCs in water isincreased; the
detection limit of the VOCs is improved; the
evaporation quantity of
water vapor can be reduced; the next water removal, trapping and detection is facilitated.