Metadata Report for BODC Series Reference Number 1868571
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Parameters |
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Definition of BOTTFLAG | |||||||||||||||||||||||||||||||||||||||||||||||||
BOTTFLAG | Definition |
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0 | The sampling event occurred without any incident being reported to BODC. |
1 | The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material. |
2 | Analytical evidence (e.g. surface water salinity measured on a sample collected at depth) indicates that the water sample has been contaminated by water from depths other than the depths of sampling. |
3 | The feedback indicator on the deck unit reported that the bottle closure command had failed. General Oceanics deck units used on NERC vessels in the 80s and 90s were renowned for reporting misfires when the bottle had been closed. This flag is also suitable for when a trigger command is mistakenly sent to a bottle that has previously been fired. |
4 | During the sampling deployment the bottle was fired in an order other than incrementing rosette position. Indicative of the potential for errors in the assignment of bottle firing depth, especially with General Oceanics rosettes. |
5 | Water was reported to be escaping from the bottle as the rosette was being recovered. |
6 | The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery. |
7 | Either the bottle was found to contain no sample on recovery or there was no bottle fitted to the rosette position fired (but SBE35 record may exist). |
8 | There is reason to doubt the accuracy of the sampling depth associated with the sample. |
9 | The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage. |
Definition of Rank |
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Problem Reports
No Problem Report Found in the Database
Data Access Policy
Public domain data
These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
GO-FLO Bottle
A water sampling bottle featuring close-open-close operation. The bottle opens automatically at approximately 10 metres and flushes until closed. Sampling with these bottles avoids contamination at the surface, internal spring contamination, loss of sample on deck and exchange of water from different depths.
There are several sizes available, from 1.7 to 100 litres and are made of PVC with a depth rating of up to 500 m. These bottles can be attached to a rosette or placed on a cable at selected positions.
Dissolved and Colloidal Trace Metals for cruises Belgica BG9309 and BG9322, Charles Darwin CD84 and RRS Discovery DI216
Document History
Converted from CDROM documentation.
Content of data series
ALXXLGD2 | Dissolved aluminium |
Lumogallion (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
ALXXLGTX | Dissolved + reactive particulate aluminium |
Lumogallion (unfiltered) | |
Nanomoles per litre | |
CDXXFXC1 | Colloidal cadmium |
Difference between freon extract/AA analyses on 0.4 µm pore and 104 Dalton filtered water | |
Nanomoles per litre | |
CDXXFXD2 | Dissolved cadmium |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
COXXFXD2 | Dissolved cobalt |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
CUXXCVDX | Dissolved copper |
Cathodic stripping voltammetry (UV digested) | |
Nanomoles per litre | |
CUXXFXC1 | Colloidal copper |
Difference between freon extract/AA analyses on 0.4 µm pore and 104 Dalton filtered water | |
Nanomoles per litre | |
CUXXFXD2 | Dissolved copper |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
FEXXFXC1 | Colloidal total iron |
Difference between freon extract/AA analyses on 0.4 µm pore and 104 Dalton filtered water | |
Nanomoles per litre | |
FEXXFXD2 | Dissolved total iron |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
MNXXFXD2 | Dissolved total manganese |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
NIXXCVDX | Dissolved nickel |
Cathodic stripping voltammetry (UV digested) | |
Nanomoles per litre | |
NIXXFXC1 | Colloidal nickel |
Difference between freon extract/AA analyses on 0.4 µm pore and 104 Dalton filtered water | |
Nanomoles per litre | |
NIXXFXD2 | Dissolved nickel |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
PBXXFXD2 | Dissolved lead |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre | |
ZNXXFXD2 | Dissolved zinc |
Freon extract/atomic absorption (0.4/0.45 µm pore filtered) | |
Nanomoles per litre |
Data Originator
Dr Peter Statham, Southampton Oceanography Centre, UK.
Sampling strategy and methodology
Trace metal clean procedures developed for open ocean work were used throughout the sample collection and processing. Seawater samples were filtered directly from the CTD rosette bottles (Teflon lined GoFlo on cruises BG9309, BG9322A and CD84: lever-action Niskin bottles on cruises CD94 and DI216) under about 1 bar nitrogen pressure through acid-cleaned 0.4 micron Nuclepore filters mounted in PTFE holders.
Samples were acidified by addition of 1 ml sub-boiling distilled HNO3 per litre of seawater (except samples for Al analysis) and stored in acid-cleaned (Morley et al. 1988) low density polythene bottles.
This was undertaken using the specialised clean facilities in the Department of Oceanography, University of Southampton and (from 1994) Southampton Oceanography Centre. Dissolved metals were extracted and pre-concentrated following the dithiocarbamate complexation-freon extraction method of Danielsson et al. (1982), as modified by Statham (1985) and Tappin (1988), and were determined by graphite furnace atomic absorption spectrophotometry (GFAAS). Within batch analytical precision of the method is generally less than 10% (coefficient of variation) for each metal. More details of the method are given in Tappin et al. (1992).
Quality control (i.e. accuracy and between batch analytical precision) of the data was assessed by regularly analysing aliquots of the CASS-1 coastal seawater reference sample for dissolved trace metals and a bulk filtered acidified sea water sample which was used for batch-to-batch quality control. Results of these analyses were satisfactory, with very few exceptions, and ensure that the data are of high quality.
The method used for aluminium analysis by Peter Statham's student (Ruth Parker) on Discovery 216 is exactly as described below for David Hydes and Lei Chou.
Comments on data quality
Charles Darwin cruise CD84
In the second OMEX annual report, IBM reported that an intercalibration exercise between IBM and SOC on this cruise showed the IBM Cd concentrations to be about 20% higher, Cu determinations from both laboratories to be virtually identical and IBM Ni determinations to be lower.
A small number of very high values in both the IBM and SOC data sets that may only be explained in terms of contamination have been flagged suspect ('M') by BODC. Other values flagged 'M' which otherwise look reasonable are from bottles for which there is strong evidence of contamination of deep water samples by shallow water through leakage.
A number of data values in the ULB aluminium data set have been flagged either 'L' or 'M' in the database. The data values flagged 'L' were reported as contaminated by the originator. The values flagged 'M' are from bottles where there is strong evidence of contamination of deep water samples by shallow water through leakage.
Discovery cruise DI216
A number of data values in the ULB aluminium data set have been flagged either 'L' or 'M' in the database. The data values flagged 'L' were reported as contaminated by the originator. The values flagged 'M' are from bottles where there is strong evidence of contamination of deep water samples by shallow water through leakage.
References
Achterberg, E. P. and van den Berg, C. M. G., 1994. Automated voltammetric system for shipboard determination of metal speciation in sea water. Anal. Chim. Acta 284, 463-471.
Colombo, C and van den Berg, C. M. G., 1997. Simultaneous determination of several trace metals in seawater using cathodic stripping voltammetry with mixed ligands. Anal. Chim. Acta 337, 29-40.
Danielsson, L.G., Magnusson, B., Westerlund, S. and Zhang, K., 1982. Trace metal determination in estuarine waters by electrothermal AAS after extraction of dithiocarbamate complexes into freon. Anal. Chim. Acta, 144, 183-188.
Hydes, D.J. and P.S. Liss, 1976. A fluorometric method for the determination of low concentrations of dissolved aluminium in natural waters. The Analyst, 101, 922-931.
Mills, G.L., McFadden, E. and Quinn, J.G., 1987. Chromatographic studies of dissolved organic matter and copper-organic complexes isolated from estuarine waters. Mar. Chem., 20, 313-323.
Morley, N.H., Fay, C.W., and Statham, P.J., 1988. Design and use of a clean shipboard handling system for seawater samples. Advances in Underwater Technology, Ocean Science and Offshore Engineering, 16, Oceanology '88, 283-289.
Nimmo, M., van den Berg, C. M. G. and Brown, J., 1989. The chemical speciation of dissolved nickel, copper, vanadium and iron in Liverpool Bay, Irish Sea. Coastal Shelf Res. 29, 57-74.
Pihlar, B., Valenta, P. and Nurnberg, H. W., 1981. New high-performance analytical procedure for the voltammetric determination of nickel in routine analysis of waters, biological materials and food. Fres. Z. Anal. Chem. 307, 337-346.
Statham, P.J., 1985. The determination of dissolved manganese and cadmium in sea water at low nmol l-1 concentrations by chelation and extraction followed by electrothermal atomic absorption spectrometry. Anal. Chim. Acta, 169, 149-159.
Tappin, A.D., 1988 Trace metals in shelf seas of the British Isles, Ph.D.Thesis, University of Southampton, 279pp.
Tappin A.D., D.J. Hydes, P.J. Statham and Burton, J.D., 1992. Concentrations, distributions and seasonal variability of dissolved Cd, Co, Cu, Mn, Ni, Pb and Zn in the English Channel. Continental Shelf Research, 12,.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 1993-05-03 |
End Date (yyyy-mm-dd) | 1993-05-03 |
Organization Undertaking Activity | Free University of Brussels, Laboratory of Chemical Oceanography and Water Geochemistry |
Country of Organization | Belgium |
Originator's Data Activity Identifier | BG9309_CTD_GC10H |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for BG9309_CTD_GC10H
Sample reference number | Nominal collection volume(l) | Bottle rosette position | Bottle firing sequence number | Minimum pressure sampled (dbar) | Maximum pressure sampled (dbar) | Depth of sampling point (m) | Bottle type | Sample quality flag | Bottle reference | Comments |
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551938 | 10.00 | 399.30 | 400.80 | 395.90 | Niskin bottle | No problem reported | ||||
551939 | 10.00 | 599.30 | 600.80 | 593.80 | Niskin bottle | No problem reported | ||||
551940 | 10.00 | 799.30 | 800.80 | 791.50 | Niskin bottle | No problem reported | ||||
551941 | 10.00 | 976.10 | 977.60 | 966.00 | General Oceanics GO-FLO water sampler | No problem reported | ||||
551943 | 10.00 | 1199.30 | 1200.80 | 1186.20 | General Oceanics GO-FLO water sampler | No problem reported | ||||
551945 | 10.00 | 1631.30 | 1632.80 | 1611.70 | General Oceanics GO-FLO water sampler | No problem reported |
Please note:the supplied parameters may not have been sampled from all the bottle firings described in the table above. Cross-match the Sample Reference Number above against the SAMPRFNM value in the data file to identify the relevant metadata.
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | BG9309 |
Departure Date | 1993-04-19 |
Arrival Date | 1993-05-06 |
Principal Scientist(s) | Roland Wollast (Free University of Brussels, Laboratory of Chemical Oceanography and Water Geochemistry) |
Ship | RV Belgica |
Complete Cruise Metadata Report is available here
Fixed Station Information
No Fixed Station Information held for the Series
BODC Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
Flag | Description |
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Blank | Unqualified |
< | Below detection limit |
> | In excess of quoted value |
A | Taxonomic flag for affinis (aff.) |
B | Beginning of CTD Down/Up Cast |
C | Taxonomic flag for confer (cf.) |
D | Thermometric depth |
E | End of CTD Down/Up Cast |
G | Non-taxonomic biological characteristic uncertainty |
H | Extrapolated value |
I | Taxonomic flag for single species (sp.) |
K | Improbable value - unknown quality control source |
L | Improbable value - originator's quality control |
M | Improbable value - BODC quality control |
N | Null value |
O | Improbable value - user quality control |
P | Trace/calm |
Q | Indeterminate |
R | Replacement value |
S | Estimated value |
T | Interpolated value |
U | Uncalibrated |
W | Control value |
X | Excessive difference |
SeaDataNet Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
Flag | Description |
---|---|
0 | no quality control |
1 | good value |
2 | probably good value |
3 | probably bad value |
4 | bad value |
5 | changed value |
6 | value below detection |
7 | value in excess |
8 | interpolated value |
9 | missing value |
A | value phenomenon uncertain |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: BG9309_CTD_GC10H
Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.
If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
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1263387 | Water sample data | 1993-05-03 10:41:00 | 47.39275 N, 7.27072 W | RV Belgica BG9309 |
1868337 | Water sample data | 1993-05-03 10:41:00 | 47.39275 N, 7.27072 W | RV Belgica BG9309 |