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)

Table 6 Retention times (Rt _stds ) of polyaromatic hydrocarbons (PAHs) obtained by SBSE-TD-GC-MS analyses of a standard mixture (10 μg/L)

Compounds	Molecular formula	Rt _stds (min)	Rt _fluids (min)	m/z
naphthalene (N)	C10H8	8.47	8.52	128
acenaphthene (A)	C12H10	11.86	11.87	154
fluorene (F)	C13H10	12.85	12.86	166
phenanthrene (P)	C14H10	14.70	14.71	178
anthracene (An)	C14H10	14.79	14.81	178
fluoranthene (Fl)	C16H10	17.04	17.06	202
pyrene (P)	C16H10	17.46	17.47	202

Detection of the compounds was achieved using the molecular ion for each compound (last column). The NIST08 library was used for identification. Retention times (Rt _fluids) obtained in hydrothermal fluid samples of this study are given for direct comparison.

ISSN: 1467-4866