Background wet deposition of mercury in Great Britain

Rowland, A.P.; Lawlor, A.J.; Guyatt, H.J.; Wadsworth, R.A.. 2010 Background wet deposition of mercury in Great Britain. Journal of Environmental Monitoring, 12. 1747-1755.

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Precipitation samples have been collected on a monthly basis from a network of 10 sites in Great Britain (GB) in order to estimate background mercury (Hg) deposition in the rural environment. Collection started in February 2005 and results presented here cover the period up to June 2009. The annual volume-weighted mean (AVWM) Hg concentrations ranges from 1.0 ng L-1 at Cockley Beck in the Lake District in 2006 to 8.8 ng L-1 at Heigham Holmes on the Norfolk Coast England in 2008. The largest validated solution concentrations was 33.7 ng L-1 Hg measured at Cockley Beck in May 2008. The large difference in rainfall amount between sites means that the remote site at Cockley Beck has both the lowest long-term AVWM concentration (1.6 ng L-1) and the greatest annual flux is greatest at 43 mg ha-1 yr-1. Predicted deposition tends to be much greater in western Britain where the greater rainfall occurs. Because some observations are very close to the analytical detection limit (1.0 ng L-1), rigorous cleaning procedures, the use of replicate samplers to monitor contamination, and the inclusion of ‘bottle blanks’ are required to obtain valid measurements of Hg in the bulk deposition. Deposition in rural sites is equivalent to about 10% of the estimated magnitude of known emissions in GB.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
UKCEH and CEH Sections/Science Areas: Shore
ISSN: 1464-0325
NORA Subject Terms: Chemistry
Atmospheric Sciences
Date made live: 07 Sep 2010 09:14 +0 (UTC)

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