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Table 5 Retention times (Rtstds) of monoaromatic hydrocarbons obtained by SBSE-TD-GC-MS analyses of a standard mixture (BTEX at 10 μg/L)

From: Characterisation of dissolved organic compounds in hydrothermal fluids by stir bar sorptive extraction - gas chomatography - mass spectrometry. Case study: the Rainbow field (36°N, Mid-Atlantic Ridge)

Compounds Molecular formula Rt stds (min) Rt fluids (min)
toluene (T) C7H8 3.28 3.26
ethylbenzene C8H10 4.33 4.34
p-xylene / m-xylene C8H10 4.45 4.43
o-xylene C8H10 4.74 4.71
styrene C8H8 4.74 4.71
isopropylbenzene C9H12 5.10 -
n-propylbenzene C9H12 5.49 -
1,3,4-trimethylbenzene C9H12 5.61 -
tert-butylbenzene C10H14 5.96 -
1,3,5-trimethylbenzene C9H12 6.00 -
sec-butylbenzene C10H14 6.21 -
paraisopropyltoluene C10H14 6.39 -
n-butylbenzene C10H14 6.81 -
  1. Detection of the compounds was achieved using ions m/z 91, 103.9, 104.9, 120 and 133.9. The NIST08 library was used for identification. Retention times (Rt fluids) obtained in hydrothermal fluids samples of this study are given for direct comparison.