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Volatile Organics Quality Assurance

The field equipment for canister sampling must be:

  1. easy to diagnosis problems
  2. start and stop on time accurately
  3. have a steady and controllable flow rate
  4. must establish a complete seal under vacuum and pressure to insure sample integrity
  5. sample must not be contaminated by the pump and other internal parts of the sampler

The QA program for the sampler is designed to check all the factors listed above. Every sample (new or repaired) undergoes testing for:

  1. accuracy of timer and flow controller under two different flow rates.
  2. cleanliness of infernal parts in the sample flow path (target compounds must be below 0.2 ppbv after zero air blank test in the lab)
  3. leak test for 30 minutes
  4. ease of operation

Field operations are designed to insure proper sampler operation and sample integrity.

  1. The operator leak tests the sampler every time a new sampling event is set up. If a leak test is failed, measures are taken to repair the system untll the leak test is passed (or sampler is replaced).
  2. If a canister has less than 25 inches of Hg vacuum, it is not used as it has leaked since it was sent to the field.
  3. If the final pressure is less than 5 psig it is noted on the field form and central office staff will prepare another sampler in case the next sample is also below 5 psig. Nominal pressure from the field should be 10 psig.
  4. If a sample arrives in the lab at ambient pressure it is not analyzed because it has leaked and sample integrity has been compromised. The field operator is notified to make certain a good seal is formed on removal of the canister form the sampler.
  5. Any sample problems are noted on the field form and logged into the database to track problems with the canisters and samplers.

LABORATORY ANALYSIS

Laboratory functions must be tested routinely to insure high quality data. Accuracy and precision are checked quarterly and annually to track system performance. Calibration standards are analyzed before, during and after every batch of samples. Instrument tuning is checked prior to every analytical run.

In addition:

  1. A re-analysis of a sample is performed at a rate of once every 10 sample analysis.
  2. Every sample is leak tested prior to beginning an analytical run.
  3. The cryogenic sample concentrator tracks flow rates and temperatures for every sample and creates a report of that sample for analyst review.

Quality Assurance Report for the Bureau of Air Quality Surveillance
Toxics Sampling Network
Sampling Precision Analysis

prepared by:
Bureau of Quality Assurance
Quality Assurance Section

The following tabulations and graphical presentation were developed based on analysis of duplicate samples at New York State's toxics air monitoring sites.

Each sampling site has three sample channels that operate simultaneously every six days. One sample channel is a low flow channel that operates at approximately 7 cc/min. The other two channels are high flow and operate at approximately 15 cc/min. The two high flow samples from each site are analyzed independently and the mean and standard deviation of the percent difference between the two samples calculated for each sample pair. From this, the 95% confidence limits are calculated for each compound using the equation:

mean +/- [1.96 x (Std. Dev)]

Although the mean of the percent differences between the sample pairs for most compounds are small, the standard deviations are in most cases large. This is because small differences in very low concentrations, i.e. 1.0 ppb compared to 0.5 ppb, result in large percent differences. The results are broad 95% confidence limits. This information is valuable, however, since it illustrates the variability that can be expected between individual sample pairs.

This information is useful to those evaluating ambient toxics sampling data, since it illustrates the degree of uncertainty associated with each sample result.

1st Quarter 1990
Sample Precision Analysis
Compound No. Sample Pairs Mean % Std. Dev. % Lower Limit Upper Limit
Dichloromethane 50 1.6 12.4 -23 26
Chloroform 10 9.2 8.9 -8 27
1,2 Dichloroethane 1*
1,1,1 Trichloroethane 76 3.4 21.0 -38 45
Benzene 65 1.9 27.2 -51 55
Carbon Tetrachloride 20 1.1 6.8 -12 14
Trichloroethylene 34 -0.8 19.7 -39 38
1,1,2 Trichloroethane 0*
Toluene 71 2.5 14.7 -26 31
Tetrachloroethylene 37 4.7 23.3 -41 50
Chlorobenzene 3*
Ethylbenzene 62 2.8 14.6 -26 32
M,P-Xylene 73 3.7 16.3 -28 36
0-Xylene 64 1.0 13.9 -26 28
1,3 Dichlorobenzene 23 -4.5 24.9 -53 44
1,4 Dichlorobenzene 0*
1,2 Dichlorobenzene 0*

*Insufficient data pairs to evaluate statistically

New York State
Department of Environmental Conservation
Division of Air Resources
Toxics Sampling Network

2nd Quarter 1990
Sample Precision Analysis
Compound No. Sample Pairs Mean % Std. Dev. % Lower Limit Upper Limit
Dichloromethane 59 4.3 14.4 -24 32
Chloroform 14 8.6 16.7 -24 41
1,2 Dichloroethane 0*
1,1,1 Trichloroethane 93 0.7 16.3 -31 33
Benzene 75 3.3 19.3 -34 41
Carbon Tetrachloride 4 1.8 7.6 -13 17
Trichloroethylene 27 3.1 17.5 -31 37
1,1,2 Trichloroethane 0*
Toluene 88 1.8 19.3 -36 40
Tetrachloroethylene 46 1.4 16.3 -31 33
Chlorobenzene 1*
Ethylbenzene 83 0.8 17.3 -33 35
M,P-Xylene 93 0.0 17.9 -35 35
0-Xylene 81 1.2 17.3 -33 35
1,3 Dichlorobenzene 39 -1.5 12.4 -26 23
1,4 Dichlorobenzene 0*
1,2 Dichlorobenzene 0*

*Insufficient data pairs to evaluate statistically

New York State
Department of Environmental Conservation
Division of Air Resources
Toxics Sampling Network

3rd Quarter 1990
Sample Precision Analysis
Compound No. Sample Pairs Mean % Std. Dev. % Lower Limit Upper Limit
Dichloromethane 59 5.1 21.5 -37 47
Chloroform 19 4.3 29.4 -53 62
1,2 Dichloroethane 1*
1,1,1 Trichloroethane 93 -2.7 21.6 -45 40
Benzene 72 3.4 20.9 -38 44
Carbon Tetrachloride 9 7.2 22.7 -37 52
Trichloroethylene 25 12.1 21.5 -30 54
1,1,2 Trichloroethane 0*
Toluene 95 2.3 16.6 -30 35
Tetrachloroethylene 44 5.9 17.2 -28 40
Chlorobenzene 3*
Ethylbenzene 88 2.7 15.4 -28 33
M,P-Xylene 104 0.8 14.4 -27 29
0-Xylene 90 2.4 15.0 -27 32
1,3 Dichlorobenzene 43 -0.8 22.1 -42 44
1,4 Dichlorobenzene 0*
1,2 Dichlorobenzene 3*

*Insufficient data pairs to evaluate statistically

New York State
Department of Environmental Conservation
Division of Air Resources
Toxics Sampling Network

4th Quarter 1990
Sample Precision Analysis
Compound No. Sample Pairs Mean % Std. Dev. % Lower Limit Upper Limit
Dichloromethane 64 -1.0 31.3 -62 60
Chloroform 24 -0.9 21.3 -43 41
1,2 Dichloroethane 0*
1,1,1 Trichloroethane 118 -7.1 19.8 -46 32
Benzene 112 4.3 23.2 -41 50
Carbon Tetrachloride 43 -5.6 18.4 -42 30
Trichloroethylene 38 5.5 16.3 -26 38
1,1,2 Trichloroethane 0*
Toluene 112 -0.1 16.7 -33 33
Tetrachloroethylene 39 10.7 23.6 -36 57
Chlorobenzene 11 6.6 11.8 -16 30
Ethylbenzene 111 2.3 13.2 -24 28
M,P-Xylene 118 2.1 13.8 -25 29
0-Xylene 112 1.3 12.0 -22 25
1,3 Dichlorobenzene 67 2.1 18.1 -33 38
1,4 Dichlorobenzene 0*
1,2 Dichlorobenzene 2*

*Insufficient data pairs to evaluate statistically

Statewide Summaries of precision data
1994
Chemical No. Sample Pairs Avg. % Diff. Standard Deviation Lower Limit % Upper Limit %
Benzene 232 1.80 25.5 51.80 -48.10
Carbon Tetrachloride 46 -4.00 26.5 48.00 -56.00
Chlorobenzene 8 -13.90 18.9 23.20 -51.00
Chloroform 6 0.80 5.6 11.80 -10.20
Methylene Chloride 38 4.90 25.3 54.50 -44.60
Ethylbenzene 212 2.70 26.8 55.20 -49.70
1,3-dichlorobenzene 16 10.10 28.0 65.10 -49.90
M,P-Xylene 239 3.10 28.8 59.60 -53.30
1,2-dichlorobenzene all results less than minimum to calculate precision
O-Xylene 277 1.70 28.2 57.00 -53.70
1,4-dichlorobenzene 12 7.80 31.0 68.60 -53.00
Tetrachloroethylene 107 3.20 35.3 72.30 -65.90
Trichloroethylene 59 0.30 15.1 29.90 -29.30
Toluene 355 0.00 32.3 63.50 -63.40
1,1,1-trichloroethane 169 3.10 27.2 56.50 -50.20
1,1,2-trichloroethane 2 33.90 N/A N/A N/A
1,2-dichloroethane 44 11.00 37.2 83.90 -61.80
Statewide Summaries of precision data
1995
Chemical No. Sample Pairs Avg. % Diff. Standard Deviation Lower Limit % Upper Limit %
Benzene 525 0.20 27.5 54.00 -53.70
Carbon Tetrachloride 11 -11.20 30.9 49.30 -71.70
Chlorobenzene 50 -1.10 45.1 87.30 -89.60
Chloroform 7 -11.10 16.8 21.90 -44.10
Methylene Chloride 55 1.70 25.6 52.00 -48.50
Ethylbenzene 419 -0.70 22.7 43.80 -45.30
1,3-dichlorobenzene 27 -1.00 23.9 45.90 47.90
M,P-Xylene 414 0.40 20.6 40.80 -40.00
1,2-dichlorobenzene 8 5.80 0.1 6.00 -5.50
O-Xylene 492 -0.50 23.2 44.80 -45.90
1,4-dichlorobenzene 12 1.40 18.3 37.20 -34.40
Tetrachloroethylene 151 2.40 32.5 66.20 -61.30
Trichloroethylene 85 2.50 21.4 44.50 -39.50
Toluene 761 1.10 31.2 62.30 -60.30
1,1,1-trichloroethane 70 0.40 31.4 61.90 -61.10
1,1,2-trichloroethane all results less than minimum to calculate precision.
1,2-dichloroethane 18 3.20 39.9 81.40 -74.90
Statewide Summaries of precision data
1996
Chemical No. Sample Pairs Avg. % Diff. Standard Deviation Lower Limit % Upper Limit %
Benzene 404 -4.20 22.4 39.60 -48.00
Carbon Tetrachloride 3 -3.30 0.5 2.40 -4.30
Chlorobenzene 2 -4.10 NA NA NA
Chloroform 2 -15.50 NA NA NA
Methylene Chloride 27 9.20 31.9 71.70 -53.30
Ethylbenzene 277 -2.60 22.2 40.90 -46.10
1,3 Dichlorobenzene 6 3.00 31.4 64.60 -58.70
M,P-Xylene 248 -4.10 21.3 37.60 -45.90
1,2 Dichlorobenzene all results less than minimum to calculate pecision
O-Xylene 342 -4.30 25.0 44.70 -53.30
1,4 Dichlorobenzene 34 -7.50 18.2 28.20 -43.30
Tetrachloroethylene 117 -3.00 21.7 39.60 -45.50
Trichloroethylene 72 -0.50 9.7 18.50 -19.40
Toluene 585 -2.90 28.4 52.70 -58.60
1,1,1 Trichloroethane 26 -1.50 36.9 70.80 -73.80
1,1,2 Trichloroethane all results less than minimum to calculate pecision
1,2 Dichloroethane all results less than minimum to calculate pecision
Statewide Summaries of precision data
1997
Chemical No. Sample Pairs Avg. % Diff. Standard Deviation Lower Limit % Upper Limit %
Benzene 270 -0.30 26.7 52.10 -52.70
Carbon Tetrachloride all results less than minimum to calculate pecision
Chlorobenzene all results less than minimum to calculate pecision
Chloroform all results less than minimum to calculate pecision
Methylene Chloride 28 -3.60 31.9 72.00 -79.50
Ethylbenzene 145 -2.20 22.2 51.60 -55.90
1,3 Dichlorobenzene 1 5.60 NA NA NA
M,P-Xylene 181 -2.10 29.6 55.90 -60.00
1,2 Dichlorobenzene all results less than minimum to calculate pecision
O-Xylene 241 -4.20 29.3 53.20 -61.50
1,4 Dichlorobenzene 43 4.20 17.9 39.30 -30.90
Tetrachloroethylene 53 -1.80 23.5 44.20 -47.80
Trichloroethylene 81 1.80 22.3 45.60 -41.90
Toluene 480 -5.10 31.90 57.50 -67.70
1,1,1 Trichloroethane 7 12.10 35.3 81.30 -57.00
1,1,2 Trichloroethane 1 -81.50 NA NA NA
1,2 Dichloroethane all results less than minimum to calculate pecision
Statewide Summaries of precision data
1998
Chemical No. Sample Pairs Avg. % Diff. Standard Deviation Lower Limit % Upper Limit %
Benzene 160 1.30 23.8 47.90 -45.30
Carbon Tetrachloride all results less than minimum to calculate pecision
Chlorobenzene all results less than minimum to calculate pecision
Chloroform all results less than minimum to calculate pecision
Methylene Chloride 27 -0.30 27.6 53.70 -54.40
Ethylbenzene 126 -1.60 23.3 44.10 -47.20
1,3 Dichlorobenzene all results less than minimum to calculate pecision
M,P-Xylene 146 -1.80 23.6 44.50 -48.10
1,2 Dichlorobenzene all results less than minimum to calculate pecision
O-Xylene 175 -1.60 25.5 48.30 -51.50
1,4 Dichlorobenzene 34 3.10 28.1 58.10 -51.90
Tetrachloroethylene 56 -6.10 21.2 35.60 -47.70
Trichloroethylene 25 -2.20 19.2 35.40 -39.80
Toluene 300 -0.80 29.0 56.10 -57.60
1,1,1 Trichloroethane 1 65.60 NA NA NA
1,1,2 Trichloroethane all results less than minimum to calculate pecision
1,2 Dichloroethane all results less than minimum to calculate pecision
Summary of Quality Control Data
1999
Compound Avg. % Diff. Standard Deviation Average Blank MDL PPBv Avg. Value
dichlorodifluoromethane 2.70% 13.30% 0.07 0.10 0.76
chloromethane -0.44% 21.64% 0.04 0.10 0.51
dichloroterafluoroethane 1.22% * 18.98% * 0.04 0.10 0.03
vinylchloride -10.15% * 90.15% * 0.03 0.08 0.01
bromomethane -4.44% * 15.52% * 0.04 0.03 0.03
chloroethane 20.77% * 72.76% * 0.04 0.10 0.03
trichloromonofluoromethane -1.12% 3.03% 0.05 0.10 0.30
1,1-dichloroethene -6.31% * 13.80% * 0.04 0.10 0.01
dichloromethane -7.43% 29.82% 0.11 0.25 0.24
trichlorotrifluoroetha 9.67% * 47.74% * 0.05 0.10 0.23
1,1-dichloroethane 11.60% 89.10% 0.03 0.10 0.01
cis 1,2-dichloroethene -17.73% 88.65% 0.04 0.10 0.01
chloroform 1.40% 4.97% 0.09 0.02 0.08
1,2-dichloroethane 2.66% 75.34% 0.05 0.01 0.02
1,1,1-trichloroethane -0.97% 3.78% 0.07 0.03 2.50
benzene 0.83% 12.84% 0.12 0.04 0.57
carbontetrachloride -1.18% 2.49% 0.04 0.02 0.12
1,2-dichloropropane 11.22% * 50.60% * 0.04 0.10 0.00
trichloroethene -6.11% * 11.50% * 0.06 0.02 0.07
cis 1,3-dichloropropene -7.64% * 104.48% * 0.04 0.10 0.01
trans 1,3-dichloropropene -10.10% * 105.41% * 0.04 0.10 0.01
1,1,2-trichloroethane 2.04% * 59.47% * 0.03 0.03 0.01
toluene -14.98% 49.92% 0.20 0.04 1.20
1,2-dibromoethane -10.12% * 24.92% * 0.05 0.10 0.01
tetrachloroethene -2.88% 10.92% 0.12 0.04 0.25
chlorobenzene 1.13% 18.84% 0.05 0.02 0.03
ethylbenzene -2.40% 7.90% 0.10 0.02 0.21
m/p-xylene 0.06% 9.25% 0.22 0.04 0.63
styrene -15.64% * 23.07% * 0.11 0.49 0.09
1,1,2,2-tetrachloroethane 15.00% * 50.33% * 0.04 0.20 0.00
o-xylene -2.82% 10.68% 0.10 0.03 0.24
1,3,5-trimethylbenzene -5.38% * 23.12% * 0.09 0.26 0.12
1,2,4-trimethylbenzene -6.87% 11.05% 0.15 0.03 0.32
Achlorotoluene -38.13% * 114.64% * 0.04 0.10 0.06
1,3-dichlorobenzene 6.75% * 56.97% * 0.08 0.03 0.03
1,4-dichlorobenzene -1.64% 7.99% 0.08 0.04 0.10
1,2-dichlorobenzene -5.33% * 7.96% * 0.08 0.03 0.02
1,2,4-trichlorobenzene -34.18% * 65.90% * 0.13 0.16 0.03
hexachlorobutadiene -18.38% * 49.64% * 0.07 0.10 0.02

* Values at or below the MDL for the compound.

Summary of Quality Control Data
2000
Compound MDL PPBv Avg. Primary Samples Avg. % Diff. Standard Deviation Average Blank PPBv Max Blank PPBv
1,3,5-trimethylbenzene 0.26 0.069 -5.38% 33.46% 0.0096 0.058
1,3-dichlorobenzene 0.03 0.048 -13.06% 87.31% 0.0088 0.043
1,4-dichlorobenzene 0.04 0.064 -8.22% 47.26% 0.0035 0.014
13Butadiene 0.050 0.022 -53.99% 90.79% 0.0000 0
2-chloroprene 0.100 0.000 0.00% 0.00% 0.0000 0
Achlorotoluene 0.10 0.020 -24.89% 101.11% 0.0026 0.015
benzene 0.04 1.148 10.50% 28.39% 0.0684 0.334
Bromodichloromethane 0.100 0.000 0.00% 0.00% 0.0009 0.008
bromomethane 0.03 0.007 27.51% 74.87% 0.0027 0.02
carbontetrachloride 0.02 0.139 2.84% 25.13% 0.0014 0.005
chlorobenzene 0.02 0.017 1.82% 35.27% 0.0061 0.027
chloroethane 0.10 0.000 0.00% 0.00% 0.0000 0
chloroform 0.02 0.044 -18.15% 45.56% 0.0036 0.03
chloromethane 0.10 0.603 3.04% 28.06% 0.0041 0.022
cis 1,2-dichloroethene 0.10 0.001 2.54% 54.04% 0.0015 0.005
cis 1,3-dichloropropene 0.10 0.002 17.31% 79.46% 0.0028 0.015
dichlorodifluoromethane 0.10 0.913 1.14% 25.84% 0.0044 0.024
dichloromethane 0.25 0.143 30.61% 72.11% 0.1205 1.851
dichloroterafluoroethane 0.10 0.014 33.60% 69.04% 0.0009 0.007
ethylbenzene 0.02 0.136 29.35% 56.37% 0.0099 0.062
hexachlorobutadiene 0.10 0.041 -20.29% 144.34% 0.0317 0.144
m/p-xylene 0.04 0.444 5.93% 31.61% 0.0307 0.175
MTBE 0.10 0.470 -1.87% 95.10% 0.0021 0.014
o-xylene 0.03 0.216 6.97% 60.04% 0.0132 0.077
styrene 0.49 0.085 7.81% 104.69% 0.0273 0.157
tetrachloroethene 0.04 0.097 3.29% 42.48% 0.0047 0.015
toluene 0.04 1.076 -2.37% 14.03% 0.0434 0.215
trans 1,3-dichloropropene 0.10 0.003 15.85% 87.35% 0.0015 0.016
Tribromomethane 0.050 0.003 21.00% 43.95% 0.1310 1.523
trichloroethene 0.02 0.028 -2.85% 70.04% 0.0028 0.017
trichloromonofluoromethane 0.10 0.386 8.45% 27.41% 0.0027 0.013
trichlorotrifluoroetha 0.10 0.124 -9.40% 48.16% 0.0017 0.009
vinylchloride 0.08 0.004 -24.07% 66.48% 0.0068 0.101
Summary of Quality Control Data
2001
Compound MDL PPBv Avg. Primary Samples Avg. % Diff. Standard Deviation Average Blank PPBv Max Blank PPBv
dichlorodifluoromethane 0.1 0.82 -1.3 4.7 0 0.03
chloromethane 0.1 0.69 2.2 8.5 0 0.07
dichlorotetrafluoroethane 0.1 0.02 20.6 71.9 0 0.02
vinyl chloride 0.08 0.01 26 66.2 0 0.03
13-Butadiene 0.05 0.08 -25.8 72.8 0 0.05
bromomethane 0.03 0.02 10.9 118 0 0.03
chloroethane 0.1 0 0 0 0 0
trichloromonofluoromethane 0.1 0.42 -0.8 3.8 0 0.03
11dichloroethene 0.1 0.01 3.7 27.4 0 0.07
dichloromethane 0.25 0.46 -6.3 44.2 0.01 0.13
trichlorotrifluoroethane 0.1 0.14 2 15.9 0 0.07
11dichloroethane 0.1 0.01 0.1 58.4 0 0.03
MTBE 0.1 2.35 -16.7 78.3 0.01 0.05
2-chloroprene 0.1 0 10.8 45.8 0 0
12dichloroethene 0.1 0.01 -15.1 75.1 0 0.05
chloroform 0.02 0.05 7.2 43.1 0.01 0.04
12dichloroethane 0.01 0.02 23.1 102.7 0.01 0.07
111trichloroethane 0.03 0.08 1.4 12 0.02 0.31
benzene 0.04 0.76 -1.1 9.3 0.07 0.17
carbon tetrachloride 0.02 0.16 -0.3 7.6 0 0.04
12dichloropropane 0.1 0.01 10.1 38.9 0.01 0.05
Bromodichloromethane 0.1 0.03 21.1 88 0 0.05
trichloroethylene 0.02 0.04 -4.5 58.3 0.01 0.09
cis13dichloropropene 0.1 0.02 -11.8 56.7 0.02 0.14
trans13dichloropropene 0.1 0.02 -11.6 56.2 0.02 0.18
112trichloroethane 0.03 0 10.8 45.8 0.01 0.18
toluene 0.04 1.82 -4.9 14.6 0.06 0.19
12dibromoethane 0.1 0.02 -10.5 56.6 0.03 0.18
tetrachloroethylene 0.04 0.23 -9.6 39.3 0.01 0.07
chlorobenzene 0.02 0.02 -30.4 83.6 0.02 0.17
ethylbenzene 0.02 0.27 0.5 36.5 0.03 0.12
P/M-xylene 0.04 0.92 1.7 34.8 0.08 0.25
Tribromomethane 0.05 0 -9 57.5 0.03 0.69
styrene 0.49 0.07 -24.8 55.7 0.06 0.26
1122tetrachloroethane 0.2 0.01 -10.3 85.5 0.02 0.12
O-xylene 0.03 0.31 -6.4 25.2 0.03 0.12
135trimethylbenzene 0.26 0.12 -10.1 40.7 0.03 0.18
124trimethylbenzene 0.16 0.33 -11.3 38.9 0.04 0.21
a-chlorotoluene 0.1 0.02 -28.1 91.7 0.03 0.19
13dichlorobenzene 0.03 0.02 -32.9 76.1 0.05 0.35
14dichlorobenzene 0.04 0.09 -38.5 64.3 0.06 0.55
12dichlororbenzene 0.03 0.02 -16.3 95.5 0.04 0.25
124trichlorobenzene 0.03 0.02 -22.8 75.8 0.11 0.49
hexachlorobutadiene 0.1 0.03 5.5 111.5 0.06 0.36
Summary of Quality Control Data
2002
Compound MDL PPBv Avg. Primary Samples Avg. % Diff. Standard Deviation Average Blank PPBv Max Blank PPBv
dichlorodifluoromethane 0.02 0.63 1.0 9.8 0.007 0.055
chloromethane 0.03 0.52 -3.3 19.0 0.003 0.175
dichlorotetrafluoroethane 0.03 0.02 4.1 25.1 0.005 0.03
vinyl chloride 0.04 0.00 23.6 75.1 0.002 0.036
13-Butadiene 0.04 0.08 7.4 51.0 0.006 0.055
bromomethane 0.03 0.02 0.7 39.4 0.017 0.078
chloroethane 0.06 0.00 -0.3 2.7 0.000 0
trichloromonofluoromethane 0.03 0.31 -0.4 8.6 0.006 0.031
1,1-dichloroethene 0.02 0.00 3.0 52.8 0.005 0.031
dichloromethane 0.02 0.15 -1.2 17.1 0.011 0.117
trichlorotrifluoroethane 0.02 0.09 1.5 14.1 0.007 0.04
1,1-dichloroethane 0.02 0.01 1.9 58.2 0.007 0.04
MTBE 0.03 0.87 0.4 15.3 0.002 0.036
2-chloroprene 0.08 0.00 -2.9 24.3 0.001 0.036
1,2-dichloroethene 0.03 0.01 -5.0 51.5 0.007 0.041
chloroform 0.02 0.04 2.6 32.6 0.007 0.036
1,2-dichloroethane 0.03 0.01 -4.6 53.7 0.010 0.043
1,1,1-trichloroethane 0.02 0.06 0.9 11.8 0.011 0.052
benzene 0.03 0.41 0.4 8.4 0.038 0.206
carbon tetrachloride 0.03 0.13 1.2 8.9 0.008 0.039
1,2-dichloropropane 0.03 0.01 -1.9 63.4 0.004 0.039
Bromodichloromethane 0.02 0.01 0.0 78.7 0.007 0.039
trichloroethylene 0.02 0.05 3.5 38.4 0.009 0.045
cis 1,3-dichloropropene 0.03 0.01 -10.3 53.8 0.010 0.048
trans 1,3-dichloropropene 0.04 0.01 -5.7 54.6 0.011 0.05
1,1,2-trichloroethane 0.03 0.01 2.8 32.7 0.009 0.037
toluene 0.03 0.99 0.0 8.9 0.035 0.168
1,2-dibromoethane 0.03 0.01 -4.9 35.9 0.012 0.048
tetrachloroethylene 0.02 0.16 1.7 11.7 0.012 0.048
chlorobenzene 0.03 0.01 2.1 23.3 0.013 0.045
ethylbenzene 0.06 0.16 0.6 8.7 0.021 0.085
P/M-xylene 0.10 0.46 0.4 8.8 0.045 0.187
Tribromomethane 0.03
styrene 0.11 0.06 -1.6 27.9 0.033 0.102
1,1,2,2-tetrachloroethane 0.03 0.01 0.7 76.2 0.011 0.044
O-xylene 0.04 0.16 0.7 8.6 0.020 0.081
1,3,5-trimethylbenzene 0.05 0.06 0.8 10.9 0.018 0.084
1,2,4-trimethylbenzene 0.05 0.17 0.7 8.3 0.026 0.169
a-chlorotoluene 0.04 0.01 3.4 59.0 0.012 0.052
1,3-dichlorobenzene 0.03 0.01 2.0 27.2 0.018 0.07
1,4-dichlorobenzene 0.04 0.08 2.1 13.3 0.027 0.088
1,2-dichlororbenzene 0.03 0.01 3.3 25.3 0.018 0.05
1,2,4-trichlorobenzene 0.03 0.01 1.5 35.2 0.029 0.222
hexachlorobutadiene 0.02 0.01 12.9 49.9 0.020 0.064
graph depicting standard deviation of the network