|
The
samplers used and the sampling and analytical
methods applied are summarised in Table 2.3a and
detailed in the Commission Report in Annex
B. The sampling frequencies was identical
to those applied at the existing TAP monitoring
stations for the same pollutants. A sampling schedule
is presented in Annex
B. The detection limits of measured TAPs are
shown in Table 2.3b.
Volatile
Organic Compounds (VOC)
1,3-Butadiene,
Benzene, Trichloroethylene, and Methyl Chloride
were sampled once every 6 days according to USEPA
Method TO-14, using a programmable, passivated
stainless steel SUMMA Canister Sampler.
The
samples was analysed using Gas Chromatograph,
coupled with a Mass Specific Detector (GCMSD).
The
detailed specifications of the SUMMA sampler as
well as the sampling, analytical and QA/QC procedures
are listed in Annex
B, which is adapted from the EPD document
PT/212/96.
Carbonyls
Formaldehyde
and Acetaldehyde were sampled once every 12 days
using an Automated Carbonyl Sampler, using 2,4-dinitrophenylhydrazine
coated Sep-Pak cartridges which met the requirements
of the USEPA Method TO-11.
The
collected samples were analysed in the laboratory
using High Performance Liquid Chromatography (HPLC).
The
detailed specifications of the sampler as well
as the sampling, analytical and QA/QC procedures
are listed in Annex
B.
Polycyclic
Aromatic Hydrocarbons (PAH)
Anthracene,
Benzo(a)anthracene, Benzo(a)pyrene and Chrysene
were sampled once every month according to USEPA
Method TO-13, using high-volume PUF samplers.
As
in the case of VOCs, the analytical method has
involved using High Resolution Gas Chromatography
(HRGC) and High Resolution Mass Spectrometry (HRMS).
The
detailed specifications of the PUF sampler as
well as the sampling, analytical and QA/QC procedures
are listed in Annex
B.
|
Table
2.3a TAP Monitoring Programme
|
| TAP |
|
Sampling
Frequency |
Total
# of Samples |
|
Sampler |
Method |
Analysis
Type and Detection Limit |
| Carbonyls |
Formaldehyde
Acetaldehyde |
once
every 12 days |
field
samples field blanks collocated field samples |
38
12
12
|
Sampling
by DNPH coated cartridge |
USEPA
Method TO-11 |
High
Performance Liquid Chromatography (HPLC) 0.20
ppbv |
| VOCs |
1,3-Butadiene
Benzene Trichloroethylene Methyl chloride |
once
every 6 days |
field
samples field blanks collocated field samples |
61
12
4
|
SUMMA
passivated stainless steel canisters |
USEPA
Method TO-14 |
Gas
Chromatography Mass Specific Detector (GCMSD)
0.2 0ppbv |
| PAHs |
Anthracene
Benzo(a)anthracene Benzo(a)pyrene Chrysene |
once
every month |
field
samples field blanks |
18
6
|
Sampling
by PUF high volume sampler |
USEPA
Method TO-13 |
Gas
Chromatography Mass Specific Detector (GCMSD)
5ng/sample |
|
Table
2.3b Detection Limits (DLs) for Measured
Toxic Air Pollutants
|
| Compound |
DL(ppbv) |
DL
(ugm-3) |
Half
of DL (ugm-3) |
| Methyl
chloride |
0.20 |
0.42 |
0.21 |
| 1,3-butadiene |
0.20 |
0.48 |
0.24 |
| Benzene |
0.20 |
0.65 |
0.33 |
| Trichloroethylene |
0.20 |
1.09 |
0.55 |
| Tetrachloroethylene |
0.20 |
1.38 |
0.69 |
| Formaldehyde |
0.20 |
0.25 |
0.12 |
| Acetaldehyde |
0.20 |
0.37 |
0.18 |
| Compound |
DL
(ng/sample) |
DL
(ng m-3) |
Half
of DL (ngm-3) |
| Anthracene |
5.00 |
0.02 |
0.01 |
| Benzo(a)anthracene |
5.00 |
0.02 |
0.01 |
| Benzo(a)pyrene |
5.00 |
0.02 |
0.01 |
| Chrysene |
5.00 |
0.02 |
0.01 |
|
|