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INSTRUMENT/METHOD |
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| INSTRUMENT : gas chromatograph (GC) with capilary column | IDENTIFIER : IO481997IN038 | ||
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Project : MAST III/MTPII/MATER |
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Laboratory :
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, adress as above, email: bklein@physik.uni-bremen.de
INSTRUMENT NAME : gas chromatograph (GC) with capilary column
MANUFACTURER : CG : 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 X
OTHER ATTACHED EQUIPEMENT :
DATE (of updating this form) : 18.10.1999
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MEASURED PARAMETER 1 |
CALIBRATION DATE |
CRUISES |
COMMENTS |
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CFC-11, CFC-12, CFC-113 |
Calibration curve every 3 day, standards every 3 hours during measurement |
Urania mai2-97 |
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BIBLIOGRAPHICAL REFERENCES :
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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