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Title: Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report
Author: J.A. Proctor
Document Type: Monograph
Following detection of high aldrin and dieldrin concentrations in fish and river water in the Newlyn Catchment in 1988 enhanced routine pesticide monitoring has been carried out in this catchment. A reduction in aldrin and dieldrin concentrations was detected and reported in river water, sediments and fish in 1990 following the ban on the use of aldrin in May 1989 and changes in land-use in areas known to have been treated with aldrin historically. A further reduction in aldrin and dieldrin concentrations in river water occurred during 1991 and no failure of the relevant Environmental Quality Standard (EQS) was recorded in the Newlyn Catchment in 1991. However, there was a marked increase in the sediment pesticide concentrations, including sites located upstream of the bulb fields treated with aldrin. However, these data require validation. No further improvement in diversity was detected in the aquatic invertebrate communities of the sites downstream of the bulb fields in the Newlyn Catchment during 1991 when compared to the results of the 1990 survey.
Publisher: National Rivers Authority
Publication Date: 1992
Publication Place: Exeter
Subject Keywords: RiversCatchment basinsWater pollutionPesticidesInsecticidesOrganochlorine compoundsEnvironmental quality
Geographic Keywords: EA South WestWest Cornwall and the Fal catchmentCornwall
Extent: 5; + appendices
Total file downloads: 304

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