Journal ArticleDOI
Aqueous Ammonia Equilibrium Calculations: Effect of pH and Temperature
Reads0
Chats0
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
More filters
Journal ArticleDOI
Nitrogen removal from landfill leachate using an infiltration bed coupled with a denitrification barrier
W.D. Robertson,M.R. Anderson +1 more
TL;DR: In this paper, the authors report on the results of a three-year, pilot-scale field trial demonstrating the use of infiltration bed and nitrate barrier technology to achieve nitrogen removal in landfill leachate.
Journal ArticleDOI
Effect of sublethal concentrations of four chemicals on susceptibility of juvenile rainbow trout (Oncorhynchus mykiss) to saprolegniosis.
M Carballo,M J Muñoz +1 more
TL;DR: The effects of sublethal concentrations of a variety of chemicals on the susceptibility of rainbow trout juveniles to Saprolegnia parasitica infection was examined and infections began to appear in control animals.
Journal ArticleDOI
Effects of high ammonia concentrations on three cyprinid fish: Acute and whole-ecosystem chronic tests.
Hai-Jun Wang,Xu-Cheng Xiao,Hongzhu Wang,Yan Li,Qing Yu,Xiao-Min Liang,Weisong Feng,Jianchun Shao,Marcus Rybicki,Dirk Jungmann,Erik Jeppesen +10 more
TL;DR: The pond results suggest that fish might be more tolerant to high ammonia concentrations in natural aquatic ecosystems than under laboratory conditions, and that the existing regulatory limits for reactive nitrogen (NH3) established from lab toxicity tests might be somewhat too high at the ecosystem conditions.
Journal ArticleDOI
Molecular and physiological responses to long-term sublethal ammonia exposure in Atlantic salmon (Salmo salar)
Jelena Kolarevic,Harald Takle,Olga Felip,Elisabeth Ytteborg,Roger Selset,Christopher Good,Grete Baeverfjord,Torbjørn Åsgård,Bendik Fyhn Terjesen +8 more
TL;DR: Atlantic salmon parr adapts to the long-term sublethal ammonia concentrations with increased branchial transcription levels of ammonia and urea transporting proteins and ammonia detoxification in the brain, and results suggest that Gln synthesis is an ammonia detoxifying strategy employed in thebrain of Atlantic Salmon parr during long- term sub lethal ammonia exposure.
Journal ArticleDOI
Marine ammonification and carbonic anhydrase activity induce rapid calcium carbonate precipitation
Stefan Krause,Volker Liebetrau,Carolin R. Löscher,Florian Böhm,Stanislav N. Gorb,Anton Eisenhauer,Tina Treude +6 more
TL;DR: In this paper, the authors demonstrate microbial carbonate precipitation as a direct result of the interplay between the microbial nitrogen cycle and a microbially produced enzyme, showing that ammonification, due to intense microbial organic matter degradation, and carbonic anhydrase may play a substantial role for calcite precipitation in paleo-and shallow marine environments.
References
More filters
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.