Preliminary studies of the effects of S-triazine, carbamate, urea, and karbutilate herbicides on growth of fresh water algae

Virmani, Meenakshi; Evans, John O.; Lynn, Raymond I.

doi:10.1016/0045-6535(75)90015-6

Cited by 5 publications

(1 citation statement)

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“…Shehata et al (1995) found that, algal Chl(a) content in continuous flow system of Nile water algae, was reduced from 70% to 90% when the system was treated with 0.02 and 0.05 mg/l of gardoprim (triazine compound) than those obtained from control run. Respectively, Virmani et al (1975) and DeNoyelles et al (1982) found that, 0.5 mg/l a triazine often caused an almost complete inhibition of algal growth and photosynthesis of fresh water algae. El-Dib et al (1989) recorded that, 0.2 mg/l ardoprim inhibited the growth of fresh water alga scenedesmus quadrcaudia.…”

Section: Resultsmentioning

confidence: 99%

Growth Response of Freshwater Algae to Continuous Flow of Terbutryn

Badr

Abou-Waly

1997

Bulletin of Environmental Contamination and Toxicology

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The single species approach, although advantageous in comparability of results, has its limitations. The most important one is that the standard test species may not be the dominant species in natural water environment, so the algal assay test result may be irrelevant to that particular in the environment. Furthermore, phytoplankton in the aquatic environment is a mixed and balanced community. Algal species composition and interactions in the community during algal assay are important parameters for observing the algal response to the environmental stress (Del Giorgio et al 1991).Toxicant effects on aquatic microorganisms have been emphasized. Much of this research has dealt with phototrophic algae and cyanobacteria, which are the main primary producers in the hydrosphere (El-Dib et al 1989). A common contaminant of surface water of agricultural regions are triazine herbicides (Morris and Ron 1981). The volume of herbicide used and introduced into the aquatic environment as a final reservoir has grown markedly. Although research concerning the effects of herbicides on algae has been extensive, few studies have examined the impact on algal productivity. Long-term bioassay effects, using continuous system, is a relatively new approach in the screening of complex environmental compounds.The purpose of this study was to determine the changes in both growth and population of fresh water algae under stress of continuous flow of terbutryn concentrations and the rate of accumulated terbutryn algal cells. MATERIALS AND METHODSA laboratory-scale unit (continuous flow system) was designed to study the effect of triazine herbicide terbutryn (2,4-diamine-N-dimethylethyl) N-ethyl-6(methylthio)-5 triazine) (99.9% purity) obtained from CIBA Geigy (Swizerland) on the algal growth under continuous flow rate.

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Section: Resultsmentioning

confidence: 99%