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Title: List II metals : evaluation of standards using field data
Author: National Rivers Authority
Document Type: Monograph
Annotation: EA additional title info: October 1993
It has been proposed that the first Statutory Water Quality Objectives for rivers are to be based on Fisheries Ecosystem Use Classes and EC Directives. The Fisheries Ecosystem Use Classes will incorporate standards for List II metals, namely zinc, copper, chromium, lead, nickel and arsenic. The objective of this investigation was to compare a set of recently revised standards for List II metals against the data derived in the field in order to assess if the revised standards are both practical and ecologically relevant. Data on List II metal concentrations, water hardness, and biological scores were provided by the NRA regions for the years 1990 and 1991. Fisheries information was also provided wherever possible. The data were incorporated into an appropriate electronic database in order to facilitate manipulation and statistical analysis. The final database comprised data from 1311 monitoring sites resulting in over 1800 individual records. In addition to metal and biological data, each record identified pass/fail for the metal variables against four sets of standards: the 'existing' EQSs in DoE Circular 7/89 (both salmonid and cyprinid standards), 'proposed' EQSs and Fisheries Directive standards.
Publisher: National Rivers Authority
Publication Date: 1993
Publication Place: Runcorn
Subject Keywords: RiversRiver Quality ObjectivesDirectives (European Union)FisheriesEcosystemsMethodologyMetalsListsStandards
Taxonomic Keywords: SalmonidaeCyprinidae
Extent: 36; + appendices
Total file downloads: 250

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