A chemical survey of standing waters in south-east England, with reference to acidification and eutrophication

Bennion, Helen and Harriman, Ron and Battarbee, Rick (1997) A chemical survey of standing waters in south-east England, with reference to acidification and eutrophication. Freshwater Forum, 8, pp. 28-44.

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Abstract

This study looks at the distribution and magnitude of acidification and eutrophication in south-east England where there are no natural lakes but a large number of shallow artificial ponds. The study area is defined as the region lying within a 100 km radius of central London but excluding the area within the M25 motorway. Water samples were taken from 120 sites between mid-January and the end of February 1990, with a subsequent monthly survey of a subset of 31 of these waters. Twelve chemical variables were measured in the laboratory using standard techniques. PH values for the full dataset ranged from 3.2 to 8.4, although the majority of sites had pH values in the range 7.0 to 8.5; only five sites had a pH of less than 6.0. The five low pH sites expectedly had low alkalinities and are the only sites with values below 0.1 meq per litre. Concentrations of calcium, sodium, potassium, magnesium, chloride, sulphate and nitrate had normal distributions. The majority of sites had total phosphorus concentrations in the range 25 to 200 mu g per litre, although 10 sites had concentrations above 400 mu g per litre. The low number of acid sites suggests that surface water acidity is not a widespread regional problem in south-east England. However the survey shows that a large number of standing waters in the region have high total phosphorus and nitrate concentrations, and 89% may be considered moderately to considerably eutrophic.

Item Type: Article
Title: A chemical survey of standing waters in south-east England, with reference to acidification and eutrophication
Personal Creator/Author:
CreatorsEmail
Bennion, Helen
Harriman, Ron
Battarbee, Rick
Journal or Publication Title: Freshwater Forum
Volume: 8
Page Range: pp. 28-44
Date: 1997
ISSN: 0961-4664
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Acidification; Eutrophication; Ponds; England
Subjects: Pollution
Limnology
Chemistry
Item ID: 4577
Depositing User: Hardy B Schwamm
Date Deposited: 25 Nov 2010 12:26
Last Modified: 29 Sep 2011 16:13
URI: http://aquaticcommons.org/id/eprint/4577

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