Journal ArticleDOI
Aqueous Ammonia Equilibrium Calculations: Effect of pH and Temperature
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TLDR
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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Ammonia and toxicity criteria in polluted Onondaga lake, New York.
TL;DR: In this paper, the authors evaluated the status of Onondaga Lake, New York with respect to ammonia toxicity criteria for the spring to fall interval over 10 years (1989 to 1998) and considered the implications of revisions (n = 5) in the criteria and the omission of ionic strength effects in the most recent revisions for this saline system.
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Measurement of Diffusive Flux of Ammonia from Water
TL;DR: An instrument was developed for the measurement of gaseous ammonia concentration, NH(3(sw,eq)), in equilibrium with surface waters, notably ocean water, and good linearity between the ammonia flux and the N(T) concentration in seawater was observed, although aged seawater behaves in an unusual fashion upon N (T) addition.
Journal ArticleDOI
Management Ability and the Economics of Recirculating Aquaculture Production Systems
TL;DR: A bioeconomic model of fish growth in recirculating aquaculture systems was constructed by developing a bioenergetic model comprised of metabolic sub-models for growth, ammonia production, and oxygen consumption.
Journal ArticleDOI
Degradation of native and exotic riparian plant leaf litter in a floodplain pond
Marion Bottollier-Curtet,Marion Bottollier-Curtet,Jean-Yves Charcosset,Jean-Yves Charcosset,Anne-Marie Planty-Tabacchi,Anne-Marie Planty-Tabacchi,Eric Tabacchi,Eric Tabacchi +7 more
TL;DR: In this article, a litter-bag experiment was undertaken in a pond on the margins of a large temperate floodplain in southwestern France to assess the potential influence of the replacement of native by exotic riparian species on organic matter degradation.
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Recovery of nitrogen and phosphorus from human urine using membrane and precipitation process
TL;DR: An NPharvest technique was developed which recovered both nitrogen and phosphorus separately in the same process, enabling their use independently in thesame process.
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.