Trends in surface water chemistry of acidified UK Freshwaters, 1988–2002

Analysis of water chemistry data from 15 years of monitoring at 22 acid-sensitive lakes and streams in the UK reveals coherent national chemical trends indicative of recovery from acidification. Excess sulphate and base cations exhibit significant decline, often accompanied by an increase in an alka...

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Veröffentlicht in:Environmental pollution (1987) 2005-09, Vol.137 (1), p.27-39
Hauptverfasser: Davies, J.J.L., Jenkins, A., Monteith, D.T., Evans, C.D., Cooper, D.M.
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container_end_page 39
container_issue 1
container_start_page 27
container_title Environmental pollution (1987)
container_volume 137
creator Davies, J.J.L.
Jenkins, A.
Monteith, D.T.
Evans, C.D.
Cooper, D.M.
description Analysis of water chemistry data from 15 years of monitoring at 22 acid-sensitive lakes and streams in the UK reveals coherent national chemical trends indicative of recovery from acidification. Excess sulphate and base cations exhibit significant decline, often accompanied by an increase in an alkalinity-based determination of acid neutralising capacity (AB-ANC) and, at fewer sites, a decline in hydrogen and labile aluminium. Acid neutralising capacity determined by “charge-balance” (CB-ANC) exhibits few trends, possibly due to compound errors associated with its determination. Trend slopes in excess sulphate correlate with those for base cations, hydrogen ion and AB-ANC, with between-site variability linked to catchment hydrology, sea-salt inputs and forestry. Nitrate concentrations have not changed significantly but show high sensitivity to varying climate. Trends in AB-ANC are influenced by significant increases in dissolved organic carbon, the cause of which it is vital to establish before trends in the former can definitively be attributed to decreasing acidic deposition. Acidified UK freshwaters show recovery but there are key uncertainties with regard to DOC and ANC.
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Acid neutralising capacity
acid neutralizing capacity
Acidification
acidity
Aluminum - analysis
Carbon - analysis
Cations
Climate
Environmental Monitoring - methods
Forestry
Fresh Water
Freshwater
Humans
hydrochemistry
Hydrogen-Ion Concentration
Industry
lakes
Nitrates - analysis
Recovery
remediation
streams
Sulfates - analysis
Time Factors
Trends
United Kingdom
United Kingdom Acid Waters Monitoring Network
Water Pollutants, Chemical - analysis
water pollution
title Trends in surface water chemistry of acidified UK Freshwaters, 1988–2002
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