Leach, D.; Meharg, A.; Wright, J.; Bachiller-Jareno, N.; Tindall, I.; Moore, R.

Polychlorinated biphenyls (PCB), chlorobenzenes (CB) and organochlorine pesticides (OC) data from rivers [LOIS]

Polychlorinated biphenyls (PCB), chlorobenzenes (CB) and organochlorine pesticides (OC) data from river water collected at various sites within the Humber catchment area as part of the Land Ocean Interaction Study project (LOIS). Data were collected at regular weekly intervals and intermittently during periods of high flows. All sites were samples from early 1994 to the end of 1996 except for O12, which was sampled from November 1994 till November 1996. The sampling was carried out by the LOIS team at York University. The unfiltered samples were transported to the Institute of Terrestrial Ecology, Monks Wood, UK, where they were extracted with hexane, cleaned up by alumina column chromatography, concentrated and then analysed for CBs by Gas Chromatography-Mass Spectrometry (GC-MS) and PCBs and OCs by Gas Chromatography with Electron Capture Detection (GC-ECD).

Publication date: 2013-07-01

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Supporting documentation

Format of the dataset : Comma-separated values (CSV)

Access and use conditions

This resource is made available under the terms of the Open Government Licence

You must cite: Leach, D.; Meharg, A.; Wright, J.; Bachiller-Jareno, N.; Tindall, I.; Moore, R. (2013). Polychlorinated biphenyls (PCB), chlorobenzenes (CB) and organochlorine pesticides (OC) data from rivers [LOIS]. NERC Environmental Information Data Centre. https://doi.org/10.5285/40ba6fd0-3d41-4520-8d78-cc8c893fd974


© Centre for Ecology & Hydrology (Natural Environment Research Council)


Study area
Temporal extent
1993-09-07    to    1997-10-29

Provenance & quality

Prior to analysis the samples were stored in the dark at 4 degreesC. The sample (500ml) was transferred to a volumetric flask and extracted with 5 x 10ml aliquots of hexane. The hexane extract was transferred to a to a Kuderna-danish flask via a funnel containing anhydrous sodium sulphate and reduced to approx. 1.5ml at 80 degreesC. The extract was adjusted to exactly 1.0ml under a stream of nitrogen. The whole of the reduced extract was cleaned up on a glass column containing 0.8g of alumina deactivated with 5% water. The cleaned up extract was then reduced to 0.5ml under a stream of nitrogen. An internal standard was added (Dichlobenyl) and each extract split equally into two chromatography vials. Chlorobenzenes were analysed by GC-MS in select ion mode. Organochlorine pesticides and PCB congeners were analysed by GC-ECD. A spiked recovery and a sample blank were included with each batch of samples. The results were not corrected for recovery losses. Limits of detection were defined as the concentration of analyte that gives a signal twice that of the baseline noise. Blank sample bottles were taken into the field during sample collection and opened and closed on site. The blank bottles were extracted with 5 x 10ml of hexane and the hexane extracts analysed by the procedure used for the samples. Spiked recovery samples (hexane washed HPLC grade water, containing 0.5g of clean clay particles, spiked with all the analytes) were included in each batch. OCs and PCBs were identified by relative retention time. CBs were identified by relative retention time and ion ratios (3 ions). Calibration was by the internal standard method. A zip file of box-and-whisker plots for each determinand is available, showing the range of values (median, inter-quartile range, 1.5 * inter-quartile range, outliers) recorded at each site to enable prospective users to understand data quality.

Correspondence/contact details

Centre for Ecology & Hydrology
Maclean Building, Benson Lane, Crowmarsh Gifford
OX10 8BB
United Kingdom


Leach, D.
University of York
Meharg, A.
Centre for Ecology & Hydrology
Wright, J.
Centre for Ecology & Hydrology
Bachiller-Jareno, N.
Centre for Ecology & Hydrology
Tindall, I.
Centre for Ecology & Hydrology
Moore, R.
Centre for Ecology & Hydrology

Other contacts

Environmental Information Data Centre
NERC Environmental Information Data Centre


Spatial representation type
Tabular (text)
Spatial reference system
OSGB 1936 / British National Grid


Topic categories
Aire,  Calder,  Catchment Chlorobenzene,  DDE,  DDT,  Derwent,  Dichlorobenzene,  Dieldrin,  Ecological Processes & Resilience England Environmental monitoring facilities Hexachloro-1-3-butadiene,  Hexachlorobenzene,  Humber,  Land Ocean Interaction Study,  LOIS,  Nidd,  Ouse,  PCB,  Pentachlorobenzene,  Pollution Rees Section Sustainable Land Management Swale,  TDE,  Tetrachlorobenzene,  Time Series Trent,  Trichlorobenzene,  water quality,  Water Quality Water Resources