Sampling Procedures
Two hundred and fifty-four air samples were collected at
various sites on a campus university; these included the
study areas in the library, teaching rooms, offices, bookshops,
and restaurants. All the sites selected for sampling
were served by mechanical ventilation and air-conditioning
(MVAC) Systems. One outdoor sample was taken every
day at the plant room during the measurement period, and
a total of 43 outdoor samples were taken. The samples were
collected using the Burkard Single-Stage Air Sampler
with agar plates. The detectable range for this
sampler is 0–2200 cfu m3
, and the lowest detection limit is
8 cfu m3
. The sampling time for the Burkard Sampler was
7 min because according to the protocol set by the
American Industrial Hygiene Association [13], the sampling
time for an Anderson Bacteria Sampler was 5 min.
Since the flow rate of the Anderson Sampler was
28.3 L min1
, while the flow rate for the Burkard
Sampler was 20 L min1
, the sampling time of the
Burkard Sampler was calculated by the following formula:
Sa
Sampling ProceduresTwo hundred and fifty-four air samples were collected atvarious sites on a campus university; these included thestudy areas in the library, teaching rooms, offices, bookshops,and restaurants. All the sites selected for samplingwere served by mechanical ventilation and air-conditioning(MVAC) Systems. One outdoor sample was taken everyday at the plant room during the measurement period, anda total of 43 outdoor samples were taken. The samples werecollected using the Burkard Single-Stage Air Samplerwith agar plates. The detectable range for thissampler is 0–2200 cfu m3, and the lowest detection limit is8 cfu m3. The sampling time for the Burkard Sampler was7 min because according to the protocol set by theAmerican Industrial Hygiene Association [13], the samplingtime for an Anderson Bacteria Sampler was 5 min.Since the flow rate of the Anderson Sampler was28.3 L min1, while the flow rate for the BurkardSampler was 20 L min1, the sampling time of theBurkard Sampler was calculated by the following formula:Sa
การแปล กรุณารอสักครู่..