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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/567

Title: Substance-specific water quality criteria for the protection of South African freshwater ecosystems: methods for derivation and initial results for some inorganic toxic substances
Authors: Roux, DJ
Jooste, SHJ
MacKay, HM
Keywords: Freshwater ecosystems
Water quality
Inorganic toxic substances
Aquatic environment
Environmental protection
Ecosystems
Issue Date: Apr-1996
Publisher: Bureau Scientific Publications
Citation: Roux, DJ, Jooste, SHJ and MacKay, HM. 1996. Substance-specific water quality criteria for the protection of South African freshwater ecosystems: methods for derivation and initial results for some inorganic toxic substances. South African Journal of Science, vol. 92(4), pp 198-206
Abstract: Freshwater ecosystems form the resource base on which water users, such as the agricultural, recreational, domestic and industrial sectors depend. These essential resources therefore need to be protected and maintained in a healthy state. The Department of Water Affairs and Forestry is currently developing water quality criteria for the protection of South African freshwater ecosystems, to complement the existing National Water Quality Guidelines for domestic, industrial, agricultural and recreational use. This paper describes the methodology for the derivation of in-stream water quality criteria for inorganic toxic substances. Criteria are calculated from the results of acute and chronic toxicity tests on a number of representative species, using local data where available, and relying on international databases to supplement local information. Conservative numerical criteria are provided for aluminium, ammonia, arsenic, boron, cadmium, chlorine, chromium, copper, cyanide, fluoride, lead, manganese, mercury, molybdenum, selenium, vanadium and zinc. For each toxic substance, threshold levels at which chronic and acute toxicity effects on aquatic biota can be expected are indicated. The criteria can be applied in water quality evaluation, impact assessment, and in the setting of discharge permit conditions.
Description: Copyright: 1996 Bureau Scientific Publications
URI: http://hdl.handle.net/10204/567
ISSN: 0038-2353
Appears in Collections:Pollution and waste
Water resources and human health
General science, engineering & technology

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