INSTRUMENT FORM

 INSTRUMENT: GAS CHROMATOGRAPH IDENTIFIER: GN361999IN043 


 PROJECT: MAST III-MTP II-MATER

LABORATORY (Owner of the instrument or who performs the method):

Prof. Dr. W. Roether

Address :

Universität Bremen, FB 1, Institut fuer Umweltphysik
P.O.Box 330 440
28334 Bremen, Germany

Tel : 49 (0)421 218 3511   Fax : 49 (0)421 218 7018

Email : wroether@physik.uni-bremen.de

CONTACT SCIENTIST :

Dr. Birgit Klein, address as above, email: bklein@physik.uni-bremen.de

INSTRUMENT NAME : gas chromatograph (GC) with capilary column

MANUFACTURER : GC : Hewlett Packard 5890, main column : J&W Scientific, Trap filling :

Alltech, Valves : Valco Instruments

MANUFACTURING DATE : 1992

SERIAL NUMBER : GC Hewlett Packard 5890

DESCRIPTION :

The gaschromatographic system at Bremen has been custom designed to allow high precision measurements

of four CFC species (CFC-11, CFC-12, CFC-113 and CCl₄). The combination of a capillary column with a

low-volume trap yields high resolution in the chromatograms and full seperation of peaks. The system is fully

automated and allows eight water samples and associated calibration measurements to be carried out un-

attented. Water samples are transferred into the system by means of flow-through containers, incorporating

glass ampoules. Generaly, measurements will be carried out immeadiately after sampling at sea, but

alternatively the ampoules can be flame-sealed, allowing sample storage for later analysis ashore. Standard

gas is used for calibration and all concentrations are reported on the SIO93 scale. The overall precision for

surface waters amounts to ± 0.6% (CFC-11, CFC-12) ± 1.5% (CFC-113) and ± 2.4% (CCl₄). Detection limits

are 0.002, 0.002, 0.008 and 0.003 pmol/kg for CFC-11, CFC-12, CFC-113 and CCl₄.

TECHNICAL CHARACTERISTICS :

The gas chromatograph is a Hewlett Packard 5890, the main column GS GASPRO (ID 0.32 mm, 30 m long) is

manufactored by J&W Scientific and the trap column (1mm ID, 10 cm long) is filled with Unibeads 2S (Alltech).

COMMENTS :

INSTRUMENT TYPE : Laboratory equipement

OTHER ATTACHED EQUIPEMENT (In case of complex multi sensor : Platform equipment): -

BIBLIOGRAPHICAL REFERENCES (METHODOLOGY):

Bulsiewicz, K. , H. Rose, O. Klatt, A. Putzka and W. Roether, A capillary- column chromatographic system for efficient chlorofluorocarbon measurement in ocean waters, J. Geophys. Res., Vol. 103, C8, 15959-15970, 1998.

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For any question or remarks please contact to Dr Birgit Klein