Session 3

1
Session 3 Particulates Data Handling

• Mercury Speciation Workshop

330 Nantucket Blvd. Toronto, Canada M1P 2P4
Rev 1..10 Nov 2003
2
Issues in Session Three

• 1 How effective is the current inlet device?
• 2 Are large particles the reason for differences
  between total Hg by pyrolysis vs. total Hg using
  the Model 1130/35/2537A?
• 3 Background (blank) correction schemes
• 4 What event flag conventions are being used?
• 5 What are the prerequisites for more automated
  methods of RGM calculation?

3
How effective is the current inlet device?

4
Does Impactor Pass RGM ?

• Prestbo tests in 1998

5
Are there Large Particles in the Arctic during
MDEs?
6
Pyro vs Model 1130/35

• Two devices are measuring slightly different
  things
• Pyro measures total particulate loading
• 1130/35 measures fine fraction particulates (lt
  2.5 µm)
• Difference could be legitimate coarse particulate
  fraction
• Could also be losses of RGM on inlet surfaces
• Dirty impactor surfaces
• Insufficient heating

7
Background Correction

8
Speciation Data Handling

• All results are reported through the Model 2537A
  serial port
• Event Flag field tells you what variable is being
  reported
• Internal Model 2537A scale factor allows direct
  reading in pg/m3 for RGM and HgP
• Combine program may be used to split of data for
  different Hg fractions into separate columns
• Excel is usually used to average, sum up, blank
  correct, and plot readings as required
• End result is true simultaneous determination of
  Hg0, RGM and HgP

9
Desorption Cycle Results
Date Time Typ C Stat AdTim Vol
Bl BlDev MaxV Area ng/m3 01-10-01
011500 CONT A OK 0 300 6.25 0.108 .037
0.165 201903 5.560 01-10-01 012000 CONT B
OKF 1 300 6.26 0.108 .024 0.112 13488
2.892 01-10-01 012500 CONT A NPF 1 300
6.25 0.108 .049 .000 0 .000 01-10-01
013000 CONT B OKF 1 300 6.25 0.108 .029
0.108 1438 0.309 01-10-01 013500 CONT A
OKF 2 300 6.25 0.108 .029 0.109 5205
1.120 01-10-01 014000 CONT B OKF 2 300
6.25 0.108 .042 0.119 41463 8.914 01-10-01
014500 CONT A OKF 2 300 6.25 0.107 .040
0.109 5696 1.226 01-10-01 015000 CONT B
OKF 2 300 6.25 0.108 .023 0.109 4865
1.046 01-10-01 015500 CONT A OKF 3 300
6.25 0.108 .021 0.144 126103 27.124 01-10-01
020000 CONT B OKF 3 300 6.25 0.108 .053
0.116 26556 5.709 01-10-01 020500 CONT A
OKF 3 300 6.25 0.105 .082 0.108 9549
2.054 01-10-01 021000 CONT B OKF 1 300
6.25 0.105 .026 0.106 2561 0.550 01-10-01
021500 CONT A NPF 1 300 6.25 0.107 .037
.000 0 .000 01-10-01 022000 CONT B OK
0 300 6.23 0.108 .050 0.165 197747
5.455
10
Combine Output Format
Input File D\TEKRAN\TRAINING\1135.DAT Output
File D\TEKRAN\TRAINING\1135.col Number of
columns 4 Column 1 Field ng/m3 Cart
AB Status 0 Column 2
Field ng/m3 Cart AB Status 1
Column 3 Field ng/m3 Cart AB
Status 2 Column 4 Field ng/m3
Cart AB Status 3
Date Time Typ C Stat AdTim Vol Bl
BlDev MaxV Area ng/m3 Column1 Column2
Column3 Column4 01-10-01 005501 CONT A OK 0
300 6.25 0.107 .036 0.165 203582 5.606
5.606 01-10-01 010001
CONT B OK 0 300 6.25 0.107 .053 0.166
204356 5.622 5.622
01-10-01 010501 CONT A OK 0 300 6.25
0.107 .041 0.165 200855 5.530 5.530
01-10-01 011001 CONT B OK 0
300 6.25 0.107 .044 0.166 202105 5.561
5.561 01-10-01 011501
CONT A OK 0 300 6.25 0.108 .037 0.165
201903 5.560 5.560
01-10-01 012001 CONT B OKF 1 300 6.26
0.108 .024 0.112 13488 2.892
2.892 01-10-01 012501 CONT A
NPF 1 300 6.25 0.108 .049 .000 0
.000 .000 01-10-01
013001 CONT B OKF 1 300 6.25 0.108 .029
0.108 1438 0.309 0.309
01-10-01 013501 CONT A OKF 2 300 6.25
0.108 .029 0.109 5205 1.120
1.120 01-10-01 014001 CONT B OKF 2
300 6.25 0.108 .042 0.119 41463 8.914
8.914 01-10-01 014501
CONT A OKF 2 300 6.25 0.107 .040 0.109
5696 1.226 1.226
01-10-01 015001 CONT B OKF 2 300 6.25
0.108 .023 0.109 4865 1.046
1.046 01-10-01 015501 CONT A OKF 3
300 6.25 0.108 .021 0.144 126103 27.124
27.124 01-10-01 020001
CONT B OKF 3 300 6.25 0.108 .053 0.116
26556 5.709
5.709 01-10-01 020501 CONT A OKF 3 300
6.25 0.105 .082 0.108 9549 2.054
2.054 01-10-01 021001 CONT B
OKF 1 300 6.25 0.105 .026 0.106 2561
0.550 0.550 01-10-01
021501 CONT A NPF 1 300 6.25 0.107 .037
.000 0 .000 .000
01-10-01 022001 CONT B OK 0 300 6.23
0.108 .050 0.165 197747 5.455 5.455
01-10-01 022501 CONT A OK 0
300 6.25 0.108 .025 0.165 198108 5.456
5.456 01-10-01 023001
CONT B OK 0 300 6.25 0.108 .047 0.165
199661 5.493 5.493
01-10-01 023501 CONT A OK 0 300 6.25
0.108 .032 0.164 198080 5.455 5.455
01-10-01 024001 CONT B OK 0
300 6.25 0.108 .063 0.165 197029 5.419
5.419 01-10-01 024501
CONT A OK 0 300 6.25 0.108 .043 0.164
194434 5.355 5.355
01-10-01 025001 CONT B OK 0 300 6.25
0.108 .032 0.164 196977 5.419 5.419
01-10-01 025501 CONT A OK 0
300 6.25 0.108 .024 0.164 195478 5.384
5.384 01-10-01 030001
CONT B OK 0 300 6.25 0.108 .052 0.165
198595 5.464 5.464
01-10-01 030501 CONT A OK 0 300 6.25
0.108 .041 0.163 193697 5.335 5.335
01-10-01 031001 CONT B OK 0
300 6.25 0.108 .064 0.164 194459 5.350
5.350 01-10-01 031501
CONT A OK 0 300 6.25 0.108 .037 0.164
194536 5.357 5.357
Hg0 Blank HgP RGM ng/m3 pg/m3
pg/m3 pg/m3
11
Blank Correction

• Implicit assumption in all schemes
• Background mercury elutes continuously during the
  entire desorption process
• Subtract this background emission rate from each
  desorb value
• How to best determine this background value ?
• Average of before after blanks
• Which readings to ignore?

12
Event Flag Conventions

13
Tekran Standard Flag Assignments
Flag Function
0 Sample
1 Initial Zero
2 Pyro Pre-heat
2 RPF Desorb
3 RGM Heat
1 Post Cool Down
14
Alternate Flag Assignments
Flag Function
0 Sample
1 Initial Zero
2 Pyro Pre-heat
3 RPF Desorb
4 RGM Heat
5 Post Cool Down
15
Advantages of Tekran Scheme

• Reserves the 3rd event bit
• Flag values of 4-7 are available for future use
• Allows preservation of 1130/35 status along with
  one independent event (eg std addition)

16
Advantages of Alternate Scheme

• Provides more complete and unambiguous indication
  of what is going on

17
Automated Data Reduction

18
What do we need first ?

• Consensus of how to calculate RGM HgP
• Background correction
• Flag standardization

19
End of Session 3