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Table 5 Measurement uncertainty study of investigated VOCs at 5 μg/L

From: Method validation and measurement uncertainty of possible thirty volatile organic compounds (VOCs) presented in the polyethylene present in bottled drinking waters sold in Turkey

Compounds Measurement (μg/L) Standard combined uncertainty (μg/L) Expanded uncertainty (μg/L)a Relative uncertainty (%) Contributions (%) of the individual uncertainty sources
Standard preparation Sample preparation Calibration curve Repeatability
Dichloromethane 4.7 0.14 0.29 5.77 0.87 5.16 58.71 35.26
1,1-Dichloroethane 4.6 0.21 0.41 8.30 0.65 3.85 68.27 27.43
Trichloromethane 4.7 0.18 0.35 7.04 0.86 5.11 81.79 12.25
1,2-Dichloroethane 4.7 0.16 0.33 6.57 0.87 5.17 75.94 18.02
Benzene 4.6 0.20 0.40 8.03 0.76 4.53 83.00 11.70
Trichloroethene 4.5 0.23 0.47 9.30 0.65 3.88 82.00 13.46
Bromodichloromethane 4.6 0.19 0.38 7.57 0.79 4.72 81.24 13.24
Toluene 4.7 0.18 0.35 7.08 0.84 4.96 79.58 14.62
Dibromochloromethane 4.6 0.21 0.42 8.42 0.67 3.96 73.79 21.58
Tetrachloroethene 4.5 0.25 0.51 10.10 0.57 3.38 75.96 20.09
Tetrachloromethane 4.6 0.18 0.37 7.31 0.83 4.91 81.69 12.57
1,1,1,2-Tetrachloroethane 4.7 0.18 0.35 7.06 0.84 5.01 80.21 13.93
Ethylbenzene 4.6 0.18 0.36 7.18 0.82 4.90 79.59 14.69
P&M-Xylene 9.3 0.35 0.70 6.97 0.84 4.96 77.91 16.29
Styrene 4.6 0.20 0.41 8.12 0.72 4.28 78.31 16.69
O-Xylene 4.7 0.14 0.27 5.43 1.04 6.21 75.45 17.30
Tribromomethane 4.6 0.19 0.37 7.45 0.70 4.16 64.14 31.00
1,1,2,2-Tetrachloroethane 4.6 0.18 0.36 7.18 0.78 4.62 73.12 21.49
Isopropylbenzene 4.6 0.18 0.37 7.30 0.78 4.61 74.87 19.75
N-Propylbenzene 4.6 0.18 0.36 7.30 0.77 4.59 74.29 20.35
1,3,5-Trimethylbenzene 4.7 0.15 0.31 6.18 0.90 5.32 72.60 21.18
1,2,4-Trimethylbenzene 4.8 0.12 0.23 4.65 1.13 6.71 67.23 24.93
1,3-Dichlorobenzene 4.7 0.14 0.29 5.75 0.98 5.83 74.95 18.24
1,4-Dichlorobenzene 4.7 0.13 0.27 5.32 1.03 6.09 71.30 21.58
1,2-Dichlorobenzene 4.8 0.13 0.25 5.10 1.04 6.19 68.17 24.60
1,3,5-Trichlorobenzene 4.7 0.13 0.27 5.39 0.96 5.68 63.80 29.57
1,2,4-Trichlorobenzene 4.8 0.09 0.17 3.49 1.36 8.07 50.47 40.10
Naphthalene 4.8 0.08 0.16 3.22 1.48 8.78 53.19 36.55
Hexachloro-1,3-butadiene 4.6 0.19 0.39 7.75 0.74 4.38 75.72 19.16
1,2,3-Trichlorobenzene 4.9 0.07 0.15 2.99 1.69 10.03 63.65 24.64
  1. ak = 2, 95% confidence level