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Metadata Report for BODC Series Reference Number 1868558


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
General Oceanics GO-FLO water sampler  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Dr Peter Statham
Originating Organization University of Southampton Department of Oceanography (now University of Southampton School of Ocean and Earth Science)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier BG9309_CTD_TMXX_8:GC10F
BODC Series Reference 1868558
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1993-04-22 10:03
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 47.41294 N ( 47° 24.8' N )
Longitude 7.26699 W ( 7° 16.0' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 297.9 m
Maximum Sensor or Sampling Depth 594.8 m
Minimum Sensor or Sampling Height 1305.2 m
Maximum Sensor or Sampling Height 1602.1 m
Sea Floor Depth 1900.0 m
Sea Floor Depth Source PEVENT
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODERankUnitsTitle
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
CDXXFXD21Nanomoles per litreConcentration of cadmium {Cd CAS 7440-43-9} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
COXXFXD21Nanomoles per litreConcentration of cobalt {Co CAS 7440-48-4} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
CUXXFXD21Nanomoles per litreConcentration of copper {Cu CAS 7440-50-8} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
FEXXFXD21Nanomoles per litreConcentration of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
MNXXFXD21Nanomoles per litreConcentration of total manganese {total_Mn CAS 7439-96-5} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
NIXXFXD21Nanomoles per litreConcentration of nickel {Ni CAS 7440-02-0} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
PBXXFXD21Nanomoles per litreConcentration of lead {Pb CAS 7439-92-1} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy
SAMPRFNM1DimensionlessSample reference number
ZNXXFXD21Nanomoles per litreConcentration of zinc {Zn CAS 7440-66-6} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification, chelation, solvent extraction and atomic absorption spectroscopy

Definition of BOTTFLAG

BOTTFLAGDefinition
0The sampling event occurred without any incident being reported to BODC.
1The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material.
2Analytical 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.
3The 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.
4During 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.
5Water was reported to be escaping from the bottle as the rosette was being recovered.
6The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery.
7Either 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).
8There is reason to doubt the accuracy of the sampling depth associated with the sample.
9The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage.

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

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) 1993-04-22
End Date (yyyy-mm-dd) 1993-04-22
Organization Undertaking ActivityFree University of Brussels, Laboratory of Chemical Oceanography and Water Geochemistry
Country of OrganizationBelgium
Originator's Data Activity IdentifierBG9309_CTD_GC10F
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for BG9309_CTD_GC10F

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
551815   10.00      300.30  301.80  297.90 General Oceanics GO-FLO water sampler No problem reported    
551817   10.00      451.30  452.80  447.40 General Oceanics GO-FLO water sampler No problem reported    
551819   10.00      600.30  601.80  594.80 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
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
Q value below limit of quantification

Appendix 1: BG9309_CTD_GC10F

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 IdentifierData CategoryStart date/timeStart positionCruise
1263375Water sample data1993-04-22 10:03:0047.41294 N, 7.26699 WRV Belgica BG9309