24200dba-d0f4-4be4-ae6f-2c6ec1147fa4 English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2025-11-13T16:26:24 UK GEMINI 2.3 WGS 84 Dissolved polycyclic aromatic hydrocarbons (PAHs) and dissolved organic carbon (DOC) in the River Wyre (northwest England) 2013-11-01 publication https://catalogue.ceh.ac.uk/id/24200dba-d0f4-4be4-ae6f-2c6ec1147fa4 10.5285/24200DBA-D0F4-4BE4-AE6F-2C6EC1147FA4 doi: Moeckel, C., Monteith, D.T., Llewellyn, N.R., Henrys, P.A., Pereira, M.G. (2013). Dissolved polycyclic aromatic hydrocarbons (PAHs) and dissolved organic carbon (DOC) in the River Wyre (northwest England). NERC Environmental Information Data Centre 10.5285/24200DBA-D0F4-4BE4-AE6F-2C6EC1147FA4 Data on concentrations of dissolved PAHs and dissolved organic carbon (DOC) in 20 water samples collected from the River Wyre at five sites between Marshaw Wyre, one of the two headwaters of the River Wyre, and Garstang from August 2010 to June 2011. As typical for this region, the upland reaches of this river drain peatland areas, resulting in a relatively high dissolved organic carbon content. PAHs were measured as freely dissolved PAHs (i.e. freely dissolved in the water phase) and total dissolved PAHs (the sum of freely dissolved and those associated with DOC) and the fractions associated with DOC have been estimated from these two. Where possible, the DOC-water partition coefficient of the PAHs, calculated from the concentrations determined, is given as well. The data is presented as one table and two supporting files containing metadata. Full details about this dataset can be found at https://doi.org/10.5285/24200DBA-D0F4-4BE4-AE6F-2C6EC1147FA4 Monteith, D. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk pointOfContact Moeckel, C. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Monteith, D.T. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Llewellyn, N.R. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Henrys, P.A. Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0003-4758-1482 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Pereira, M.G. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian NERC Environmental Information Data Centre info@eidc.ac.uk publisher UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk owner notPlanned Environmental Monitoring Facilities theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication polycyclic aromatic hydrocarbon dissolved organic carbon chemistry GEMET - Concepts, version 4.1.3 2019-01-28 creation England GeoNames 2006-01-01 creation Pollution upland river River Wyre water DOC PAH otherRestrictions no limitations otherRestrictions This resource is made available under the terms of the Open Government Licence otherRestrictions © UK Centre for Ecology & Hydrology otherRestrictions If you reuse this data, you should cite: Moeckel, C., Monteith, D.T., Llewellyn, N.R., Henrys, P.A., Pereira, M.G. (2013). Dissolved polycyclic aromatic hydrocarbons (PAHs) and dissolved organic carbon (DOC) in the River Wyre (northwest England). NERC Environmental Information Data Centre https://doi.org/10.5285/24200DBA-D0F4-4BE4-AE6F-2C6EC1147FA4 textTable English utf8 environment 2010-08-19 2011-06-06 -3.2 -2.5 53 54.5 Comma-separated values (CSV) NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor https://data-package.ceh.ac.uk/data/24200dba-d0f4-4be4-ae6f-2c6ec1147fa4 Download the data Get a copy of this data download https://data-package.ceh.ac.uk/sd/24200dba-d0f4-4be4-ae6f-2c6ec1147fa4.zip Supporting information Supporting information available to assist in re-use of this dataset information dataset dataset Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 Water samples were taken at five sites along the River Wyre, a typical river system in the northwest of England, draining upland and agricultural areas with soils rich in organic matter. Clean amber glass bottles with Teflon-line lids were used to collect 5 L water samples for the PAH analysis from each site during each of the four sampling events (19th August 2010, 6th December 2010, 6th March 2011 and 6th June 2011). Additionally, 100 mL samples were collected for DOC analysis. Samples were kept at 5°C and processed within 48 hours of collection. Samples were filtered through a 0.45µm filter and DOC concentrations were determined on the basis of UV absorbance at 270 and 350nm using an algorithm developed by Tipping et al. 2009. Prior to processing, samples were divided into two equal sub-samples, for the analysis of total dissolved and freely dissolved PAHs respectively. To isolate freely dissolved PAHs in this second sub-sample, the DOC and DOC-associated PAHs were precipitated by adding 0.4g of Al2(SO4)3 (dissolved in 5mL of Milli-Q water) and adjusting the pH to 6, the optimal flocculation pH for Al2(SO4)317, using NaOH or HCl. The flocculated DOC was then removed by passing the sample through a GF-F using a Millipore vacuum filtration unit. Al2(SO4)3 was found to remove DOC efficiently, particularly those substances PAHs tend to partition to strongest, and does not precipitate PAHs (Laor and Rebhun, 1997). Total dissolved (the sum of freely dissolved and DOC-associated) PAHs were measured in a raw sample filtered through a GFF filter. The concentrations of PAHs associated with DOC were determined indirectly by subtracting the concentration of freely dissolved PAHs from the sum of freely dissolved and DOC-associated PAHs. Laboratory blanks were generated by treating Milli-Q water in exactly the same way as the samples. After filtration, half of each sample, was transferred to a 1.5 L separating funnel, spiked with a mixture of deuterated PAHs to monitor recovery of the extraction and cleanup method, and liquid-liquid extracted with 80 mL of dichloromethane (DCM) three times . This procedure was repeated with the remainder of each sample. The extracts of both portions were pooled and anhydrous sodium sulphate (baked at 550°C) was added to remove any remaining water. These were then reduced to 1 mL on a Buchi Syncore evaporation system and cleaned on a column packed with 0.8 g of alumina (activated at 550 °C) and a small amount of anhydrous sodium sulphate. The target compounds were eluted with 10 mL of DCM. After the samples and blanks were blown down under a gentle stream of nitrogen they were transferred to small amber vials, further reduced to ca. 0.5 mL, spiked with a solution containing d10-acenaphthene and d12-benz(a)anthracene as internal standards, and analysed for all 28 target PAHs and the recovery compounds. The GC-MS analysis was carried out on an Agilent GC 6890N coupled to an Agilent MSD 5973N. 20µL of the extracts were injected in solvent vent mode and separated on a HT8 column (SEG, 50m, 0.22mm I.D., 0.25µm film thickness) with helium as the mobile phase at a constant flow of 2 mL min-1. The programmable temperature vaporization (PTV) inlet was kept at 20°C for 0.51 min, then heated to 350°C at a rate of 700°C min-1 and kept at 350°C for 5 min. Then the temperature was reduced to 300°C min-1 at a rate of 10°C min-1. The oven temperature programme was: isothermal at 50°C for 2.5 min, 15°C min-1 to 200°C, 5°C min-1 to 250°C, 8°C min-1 to 330°C and was held at 330°C for 25.5 min. The transfer line was heated to 350°C. The MS detector was operated in EI-mode, using selected ion monitoring, the quadrupole temperature was set to 150°C and the ion source temperature to 230°C.