Original scientific paper
Investigation of the toxicity of mercury, copper, zinc and trinitroresorcinol on Lebistes retjculatus. method of survival
Ivanka Brković-Popović
; Istraživačko-razvojni centar za termotehniku i nuklearnu tehniku, Energoinvest, Sarajevo
M. Popović
; Istraživačko-razvojni centar za termotehniku i nuklearnu tehniku, Energoinvest, Sarajevo
Abstract
To evaluate the toxic effect of mercury, copper, zinc and trinitroresorcinol the medium survival time (ET50), toxicity curves and· medium lethal con· centrations were determined. During the exposure of 120 hours the toxicity curves for mercury and copper in the log-log system have a rectilinear shape. The zinc and trinitroresorcinol toxicity curves clearly show points of inflection. Unlike the toxicity curve for trinitroresorcinol which asyrnptotically approaches the time axis, in case of zinc this part is curved showing that point of inflection does not mark a threshold concentration. The results of this investigation are in favour or the assertion of other authors that the initial LC50 of heavy metals produces effect only in alkaline environments with a sufficient amount of cations which act antagonistically. During the exposure of 96 hours, the obtained medium lethal concentrations of mercury, copper and zinc were 0.041, 0.022 and 0.63 mg/l respectively. Chemical properties of the diluent were: pH = 7.2, m-alkalinity = 0.45 mval and the total hardness = 34.2mg/l CaC03. It was found that trinitroresorcinol does not produce a chronic toxic effect. The initial LC50 during the exposure of 24 hours was 51.3 mg/l with confidence limits of 47.3 and 55.7 mg/I.
Keywords
Hrčak ID:
165203
URI
Publication date:
29.6.1977.
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