Journal ArticleDOI
Aqueous Ammonia Equilibrium Calculations: Effect of pH and Temperature
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A critical evaluation of the literature data on the ammonia–water equilibrium system has been carried out and results of calculations of values of pKa at different temperatures and of percent of NH3 in aqueous ammonia solutions of zero salinity as a function of pH and temperature are presented.Abstract:
The toxicity of ammonia to fishes has been attributed to the un-ionized ammonia chemical species present in aqueous solution Because the percent of total ammonia present as un-ionized ammonia (NH3) is so dependent upon pH and temperature, an exact understanding of the aqueous ammonia equilibrium is important for toxicity studies A critical evaluation of the literature data on the ammonia–water equilibrium system has been carried out Results of calculations of values of pKa at different temperatures and of percent of NH3 in aqueous ammonia solutions of zero salinity as a function of pH and temperature are presentedread more
Citations
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Journal ArticleDOI
Acute toxicity of ammonia to juvenile sea bass (Dicentrarchus labrax L.) at different aeration levels
TL;DR: Acute toxicity of ammonia to juvenile sea bass at three aeration levels of test tanks is expressed as median lethal time (LT50) and LC50 is highly negatively correlated with the second PC whereas the correlation with the first is negative and considerably poorer.
Journal ArticleDOI
Toxicity of perfluorooctanoic acid to Pseudomonas putida in the aquatic environment.
TL;DR: The results highlighted the potential toxicological risk associated with this surfactant in the aquatic ecosystems with the presence of un-ionized NH3 in the test solutions.
Journal ArticleDOI
Growth and mortality of zebra fish, Brachydanio rerio (Hamilton Buchanan), maintained at two temperatures and on two diets
J. F. Craig,J. M. Fletcher +1 more
TL;DR: A correlation was found between instantaneous mortality and growth rates for fish between tanks when those maintained at 28°C and fed on food A were ignored, and both these groups of fish had the highest coefficients of variation in wet weights which increased during the experiment, indicating an increase in interaction within the tanks.
Journal ArticleDOI
The presence of non-native species is not associated with native fish sensitivity to water pollution in greatly hydrologically altered rivers.
Alberto Maceda-Veiga,Alberto Maceda-Veiga,Ralph Charles Mac Nally,Ralph Charles Mac Nally,Adolfo de Sostoa +4 more
TL;DR: Overall, additive effects of stressors prevail over interactions, and the restoration of natural hydro-morphology in rivers is likely to be the most effective management approach to improving the prospects for the native fish fauna.
Journal ArticleDOI
Effects of fish farm effluents on egg‐to‐fry development and survival of brown trout in artificial redds
TL;DR: Egg-to-fry development and survival of brown trout Salmo trutta were compared in two rivers of the Pyrenean piedmont, the Nives d’Arneguy and the Nive des Aldudes, with many anthropogenic activities including 11 fish farms and two sewage treatment plants.
References
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Journal ArticleDOI
Acidic dissociation constant of ammonium ion at 0 to 50 C, and the base strength of ammonia
Journal ArticleDOI
The Percent Un-Ionized Ammonia in Aqueous Ammonia Solutions at Different pH Levels and Temperatures
TL;DR: In this article, it was shown that the un-ionized ammonia molecule and not the ammonium ion is the form of the toxicant harmful to fish, and the amount of unionised ammonia in the water was quantified.