2.2.
Air
sampling
of
organic
BPs
Air
sampling
and
concentration
determination
of
organic
BPs
were
per-
formed
according
to
two
standards
of
industrial
hygiene
in
China,
respectively
(GBZ159-2004
and
GBZ/T192-2007).
The
sampling
was
conducted
at
pulverizing
and
packaging
places
at
1.5
m
above
the
floor.
Perchloroethylene
filter
(40
mm,
Nantongjinnan
Glassware
Company,
China)
was
loaded
in
the
filter
cassette
of
air
sampler
(ZC-Q,
Zhejiang
Hengda
Instrument
Company,
China).
The
flow
rate
was
at
25
l/min
and
the
sampling
time
was
15
min.
Six
air
samples
were
obtained
at
six
different
times
in
a
work
shift.
The
quartz
contents
of
BPs
samples
were
detected
according
to
an
occupational
health
standard
of
China
(GBZ/T192.4-2007).