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Table 4 CRM and inter-laboratory test results for VOCs

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 CRM Proficiency test
Certified value (μg/L) Measured value (μg/L) Recovery (%) RSD (%) Reported value (μg/L) Assigned value (μg/L) SDPA (μg/L) z-score
Dichloromethane 54.6 52.44 ± 1.14 96.0 1.82 < 6.00 < 6.00
1,1-Dichloroethane 42.4 43.18 ± 1.84 101.8 3.22 33.34 38.3 8.0 − 0.618
Trichloromethane 83.1 90.87 ± 1.44 109.43 1.47 63.90 55.8 4.9 1.640
1,2-Dichloroethane 48.0 47.77 ± 0.33 99.5 0.69 115.3 118.0 3.9 − 0.735
Benzene 17.0 18.68 ± 0.33 109.9 1.79 83.41 74.6 12.1 0.729
Trichloroethene 75.2 80.59 ± 1.71 107.2 2.00 90.12 81.2 11.2 0.796
Bromodichloromethane 41.2 40.47 ± 0.39 98.2 0.95 61.84 65.2 5.5 − 0.611
Toluene 11.0 11.04 ± 0.19 100.4 1.72 16.98 18.4 7.3 − 0.190
Dibromochloromethane < 6.00 0.53 ± 0.01 0.83 72.05 73.9 7.7 − 0.237
Tetrachloroethene 31.3 33.92 ± 0.02 108.4 2.45 < 4.30 < 4.30
Tetrachloromethane 30.4 29.77 ± 0.42 97.9 0.71 82.72 104.0 28.1 − 0.743
1,1,1,2-Tetrachloroethane 59.7 60.97 ± 0.42 102.1 0.68 139.8 130.5 18.3 0.509
Ethylbenzene 19.4 19.98 ± 0.31 103.0 1.56 < 7.00 < 7.00
P&M-Xylene 57.3 57.31 ± 0.83 100.0 1.45 62.22 54.7 9.3 0.808
Styrene 40.8 35.85 ± 0.32 87.9 0.88 < 13.00 < 13.00
O-Xylene 21.0 20.50 ± 0.19 97.6 0.94 82.81 74.1 11.7 0.745
Tribromomethane 85.6 75.26 ± 0.76 87.9 1.01 55.29 57.3 4.5 − 0.452
1,1,2,2-Tetrachloroethane 63.9 55.65 ± 0.76 87.1 1.37 62.95 65.9 13.2 − 0.225
Isopropylbenzene 62.7 60.34 ± 0.70 96.2 1.00 < 5.00 < 5.00
N-Propylbenzene 9.19 9.10 ± 0.16 99.0 1.73 < 5.00 < 5.00
1,3,5-Trimethylbenzene 37.5 38.54 ± 0.56 102.8 1.46 95.76 69.1 18.6 1.430
1,2,4-Trimethylbenzene 23.3 20.09 ± 0.27 86.2 1.33 76.36 64.0 15.7 0.786
1,3-Dichlorobenzene 50.4 45.26 ± 0.42 89.8 0.93 21.68 20.9 6.3 0.123
1,4-Dichlorobenzene 32.4 28.54 ± 0.30 88.1 1.04 93.97 79.0 15.2 0.987
1,2-Dichlorobenzene < 7.00 0.08 ± 0.01 8.07 104,0 91.3 15.4 0.825
1,2,4-Trichlorobenzene 49.4 39.67 ± 1.50 80.3 3.77 53.67 45.4 7.9 1.040
Naphthalene < 6.30 0.25 ± 0.02 9.75 66.51 62.8 12.3 0.298
Hexachloro-1,3-butadiene < 4.30 0.06 ± 0.01 5.03 50.74 46.7 15.8 0.258
1,2,3-Trichlorobenzene < 5.00 0.33 ± 0.02 8.04 < 5.00 < 5.00
  1. SDPA: Standard Deviation for Proficiency Assessment