Validation data of ITEX-GC-MS method

Compoundr2Calibration curve equationLOD (ng/L)LOQ (ng/L)Recovery (%) n = 3RSD (%) n = 9
100 ng/L250 ng/L500 ng/L100 ng/L250 ng/L500 ng/L
Benzene0.9999y = 1.59 × 105x – 3 × 10611.6035.169997993.433.012.58
Toluene0.9998y = 3.32 × 105x + 6.4 × 10510.0530.479996953.653.423.09
Ethylbenzene0.9995y = 7.40 × 104x – 88.09 × 10528.2985.7210193973.493.162.59
p-mXylene0.9997y = 1.96 × 105x – 3 × 10628.7587.139497992.582.081.85
o-Xylene0.9998y = 9.33 × 104x – 2 × 10615.3546.519797992.982.622.15

ITEX-GC-MS: in-tube extraction-gas chromatographic-mass spectrometric; RSD: relative standard deviation; LOD: limit of detection; LOQ: limit of quantification