00000nam 2200000zi 4500 9.870795 CaOODSP 20241203113647 m o d f cr bn||||||||| 190329s1996 oncd ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- En13-5/96-88E-PDF Borgmann, Uwe, author. The control of ammonia toxicity to Hyalella azteca by sodium, potassium, and pH / by Uwe Borgmann & Anne I. Borgmann. [Burlington, Ontario] : Environment Canada, Water Science and Technology Directorate = Environnement Canada, Direction générale des sciences et de la technologie, eau, [1996] 1 online resource (15, [7] pages) : charts. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 96-88 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 13-15). "The toxicity of ammonia to Hyalella azteca at constant pH in artificial media is controlled by sodium and potassium, and not by calcium, magnesium, or anions. Small increases in the LC50 for total ammonia (from 0.15 to 0.5 mM) occur as sodium is increased from 0.1 to M1 mM(and above, but major increases in the LC50 (to over 10 m_M total ammonia) require the addition of potassium. Potassium is, however, more effective at reducing ammonia toxicity at high (1 mM) sodium than at low (0.1 mM)‘ sodium. Ammonia toxicity is independent of pH at low sodium and potassium concentrations, when ammonia toxicity appears to be due primarily to the ammonium ion. At high sodium and potassium, the toxicity of the ammonium ion is reduced to the point where un-ionized ammonia also contributes to toxicity, and the LC50 becomes pH dependent. A mathematical model was produced for predicting ammonia toxicity from sodium and potassium concentrations and pH"--Abstract. Ammonia Hyalella azteca Borgmann, A., author. Canada. Environment Canada. Canada. Water Science and Technology Directorate. National Water Research Institute (Canada) NWRI contribution ; 96-88. (CaOODSP)9.844121 PDF 1.80 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-96-88-eng.pdf