A novel method for the measurement of VOCs in seawater using needle traps devices and GC-MS.

Mesarchaki, E., Yassaa, N., Hein, D., Lutterbeck, Hannah, Zindler, Cathleen and Williams, J. (2014) A novel method for the measurement of VOCs in seawater using needle traps devices and GC-MS. Marine Chemistry, 159 . pp. 1-8. DOI 10.1016/j.marchem.2013.12.001.

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Supplementary data:

Abstract

Highlights:
• Development/evaluation of a ‘needle trap device’ (NTD) method for the analysis of VOC in seawater.
• First field application of the NTD method in a Norwegian Fjord during a CO2 enrichment study.
• Identification and quantification of DMS, isoprene and α-pinene under various pCO2 levels.
• In field NTD GC-MS and P&T GC-FPD method comparison for the DMS datasets (r2 = 0.8).

Abstract:
A novel analytical method using newly developed needle trap devices (NTDs) and a gas chromatograph–mass spectrometer (GC–MS) system was developed. It has been applied for the first time on seawater samples to quantify marine volatile organic compounds (VOCs) relevant to atmospheric chemistry and climate. By purging gases from small water volumes (10 ml) onto sealable NTDs and then desorbing them thermally within the GC injection port, an effective analysis of a wide range of VOCs (isoprene to α-pinene) was achieved within 23 min. Good repeatability (RSDs < 16 %), linearity (r2 = 0.96–0.99) and limits of detection in the range of pM were obtained for all examined compounds. Following laboratory validation, the NTD method was applied in a mesocosm field study in a Norwegian Fjord. Nine individual mesocosm ecosystems under different CO2 regimes were examined. Dimethyl sulfide (DMS), isoprene and monoterpenes were identified and quantified in mesocosm seawater. The DMS measurements are compared with parallel measurements provided by an independent P&T GC–FPD system showing good correlation, r2 = 0.8. Our study indicates that the NTD method can be used successfully in place of the traditionally used extraction techniques (P&T, SPME) in marine environments to extend the suite of species typically measured and improve detection limits.

Document Type: Article
Additional Information: WOS:000331675600001
Keywords: Needle trap devices (NTDs); Seawater analysis; Volatile organic compounds (VOCs); Dimethyl sulfide (DMS); Isoprene; Monoterpenes; Mesocosm enclosures; CO2 enrichment
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.marchem.2013.12.001
ISSN: 0304-4203
Projects: SOPRAN
Date Deposited: 11 Jan 2013 13:45
Last Modified: 22 Aug 2017 13:15
URI: http://oceanrep.geomar.de/id/eprint/20084

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