| Author | Prapat Pentamwa |
| Call Number | AIT Thesis no.EV-01-15 |
| Subject(s) | Polychlorinated biphenyls
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | In this study, the airborne PCBs in Bangkok urban area (tropical climate) was evaluated. The
two major tasks were undertaken: (1) the evaluation level and phase distribution of airborne
PCBs by using active sampling method, and (2) the evaluation levels of airborne PCBs by
using passive sampling method and comparison of levels of airborne gas phase PCBs obtained
by active and passive sampling method.
The active sampling method employed an 8 stages size fractionating cascade impactor
(Anderson low volume sampler) in combination with PUF adsorbent tube connected in series.
Out of 12 PCB analyzed only seven congeners were detected (PCB 28, 31, 52, 101, 138, 153,
and 180) by GC/ECD. The Anderson low volume sampler connecting with PUF cartridge
proved to be a suitable alternative monitoring methods providing the PCBs both in gas and
particulate phase (fine and coarse). The concentration of suspended particulate matters (SPM)
with diameter size range over 2.1 µm (coarse particle) were ranging from 74-189 µg/m3 and
less than 2.1 µm (fine particle) were ranging from 45-148 µg/m3
. A bimodal form
demonstrated the mass size distribution with high accumulation in coarse size range. Total
PCB (sum of 7 detected congeners) was found to be ranged 0.77-3.3 ng/m3
. The lighter and
lower chlorinated PCB species such as PCB 31 and 52 presented at higher concentration than
higher chlorinated PCB species such as PCB101, 138, 153, and 180. The PCBs was presented
mainly in gas phase particularly lower molecular weight PCBs such as PCB28, 31, 52, 101,
and 138 (62.5%, 80.7%, 70.3%, 63.4%, and 75.6%, respectively) while PCB153 and 180 were
detected only in pmticulate phase. PCBs content were abundant in fine particle phase
(0.03-3.51 pg/µg). Concentrations of PCBs were higher at Din Daeng city center (3.3 ng/m
3
)
than in BKK U.2 suburban area (0.77 ng/m3
).
The passive sampling method by Semipermeable membranes Devices (SPMDs) was used in
parallel with the PUF cartridge. Total detected PCBs (sum of 5 PCBs) by the passive method
ranged 2.81-14.05 ng/m3 with high contribution from lighter PCB (PCB 31 and 52). The
levels found by the passive method were higher than active method and suggested that high
temperature may contribute to the increased collection efficiency of SPMD.
|
| Year | 2001 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Oanh, Nguyen Thi Kim |
| Examination Committee(s) | Supat Wangwongwatana ;Preeda Parkpian ;Lee, Seung-Hwan
|
| Scholarship Donor(s) | Royal Thai Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2001 |