50 ppb 2.0 ppb  
Compound Average Stdev Average Stdev MDL
1,1 - dichloroethylene 49.08 2.19 1.70 0.18 0.54
methylene chloride 51.28 0.49 1.93 0.10 0.30
trans - 1,2 - dichloroethylene 53.54 1.58 1.86 0.15 0.45
cis - 1,2 - dichloroethylene 52.59 0.98 1.91 0.17 0.51
chloroform 49.19 0.82 1.93 0.11 0.34
1,1,1 - trichloroethane 49.23 1.78 1.73 0.19 0.58
carbon tetrachloride 48.03 2.46 1.53 0.30 0.91
benzene 62.22 1.28 2.19 0.15 0.46
trichloroethylene 52.61 1.29 1.87 0.16 0.47
1,2 - dichloropropane 49.39 0.73 1.77 0.10 0.30
bromodichloromethane 51.51 0.67 1.82 0.10 0.29
toluene 50.62 1.17 1.71 0.13 0.38
tetrachloroethylene 54.89 1.69 1.88 0.16 0.47
dibromochloromethane 83.40 0.75 2.94 0.14 0.43
chlorobenzene 49.94 0.74 1.71 0.13 0.38
ethylbenzene 51.51 1.23 1.73 0.14 0.42
1,4 - xylene 52.50 1.18 1.73 0.13 0.40
1,2 - xylene 56.26 1.67 3.83 0.25 0.75
bromoform 52.97 0.77 1.92 0.19 0.56
1,1,2,2 - tetrachloroethane 55.29 0.57 2.04 0.11 0.34
1,3 - dichlorobenzene 53.91 0.45 1.90 0.12 0.37
1,4 - dichlorobenzene 58.12 0.45 2.03 0.13 0.40
1,2 - dichlorobenzene 54.88 0.52 1.96 0.13 0.40
1,2,4 - trichlorobenzene 62.31 0.53 2.16 0.14 0.43
  Manual One day -on-line
  1 measurement Average of 10 Stdev
chloroform 22.81 ppb 19.05ppb 1.18ppb
Note: Repeated (10 times) analysis of solutions containing 50 ppb each compounds and 2 ppb each compound done manually after manual calibration. MDL is as 3 times of standard deviation of the 2 ppb solution measurement.
Table 2: Performance data of the system.
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