Showing papers by "Geological Survey of Sweden published in 1995"

Monitoring of heavy metals in protected forest catchments in Sweden

Abstract: Long-term integrated catchment monitoring within the Swedish Environmental Monitoring Programme (PMK) aims primarely at the fate and effects of pollutants in mature ecosystems, mainly protected boreal forests. The measurements that were conducted since the early eighties, with some variation, included deposition, throughfall, litterfall and the chemistry of soil water, groundwater and runoff water.Together with, or perhaps partly due to acidification, accumulation and transport of heavy metals are a serious threat to the ecosystem and in the end to the health of human beings. This paper discuss the behaviour of Hg, Pb, Cd, Zn and Cu based on the experiece gained from the studies in the small catchment areas. The importance of present deposition, soil storage and biogeochemical condition for metal mobility to the transport of metals is discussed The storages of Hg and Pb have been built up during a long time span and are very large in comparison with the flux. The present atmospheric deposition have probably little impact on the flux, which rather is governed by the biogeochemical conditions. There is still a small accumulation of Cd, but its great mobility under acidic conditions makes input and output almost in balance. A reduction in deposition will probably have an immediate effect on flux, which also is the case for Zn. Cu generally accumulates in soil. The mobility and hence the flux are certainly regulated by the biogeochemical conditions, but more detailed studies are required to reveal the general mecanisms for Cu transport within the catchment.

Selection of springs for the groundwater monitoring program of the province of Göteborg and Bohus, SW Sweden

Abstract: The chemical composition of groundwater in springs is included in the program for monitoring of acidification in the province of Goteborg and Bohus, SW Sweden. Thirteen springs were selected for regular analysis approximately 3–4 times per year. They were chosen from a total amount of 34 springs previously investigated. Several factors connected to the character of the recharge area and spring site were used to select the most appropriate springs. The grain-size composition and characteristics of the Quaternary sediments determine the aquifer conditions and reflect the acid sensitivity of the groundwater. Thus, field classification of various sediments has been used as a major criterion for the selection of suitable springs for intensive monitoring. Geographical representativity, as well as results from annual chemical analyses between 1990 and 1994, has been considered.