Influence of dilution water ionic composition on acute major ion toxicity to the mayfly Neocloeon triangulifer
| Autor: | J. Russell Hockett, David J. Soucek, Amy Dickinson, David R. Mount |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Molar concentration Health Toxicology and Mutagenesis Sodium Potassium Salt (chemistry) chemistry.chemical_element Fresh Water 010501 environmental sciences 01 natural sciences Article Lethal Dose 50 Hardness Toxicity Tests Acute Environmental Chemistry Animals Magnesium Ephemeroptera 0105 earth and related environmental sciences chemistry.chemical_classification Ions biology Chemistry 010604 marine biology & hydrobiology Ceriodaphnia dubia Water biology.organism_classification Cladocera Acute toxicity Dilution Environmental chemistry Toxicity Calcium Salts Water Pollutants Chemical |
| Popis: | Field and laboratory studies have shown that mayflies (Ephemeroptera) tend to be relatively sensitive to elevated major ion concentrations, but little is known about how ionic composition influences these responses. The present study evaluated the acute toxicity of major ion salts to the mayfly Neocloeon triangulifer over a range of background water quality conditions. The mayfly was particularly sensitive to Na2 SO4 , with the median lethal concentration (LC50) of 1338 mg SO4 /L being lower than LC50s reported for 7 other species at that hardness. Increasing hardness of the dilution water from 30 to 150 mg/L (as CaCO3 ) resulted in doubling of LC50s for sodium salts, and an approximately 1.5-fold increase in LC50 for MgSO4 . Potassium salt toxicity was not strongly influenced by hardness, consistent with findings for other species. When hardness was held constant but the Ca to Mg ratio was manipulated, the ameliorative effect on Na2 SO4 and NaCl did not appear as strong as when hardness was varied; but for MgSO4 the amelioration relative to Ca activity was similar between the 2 experiments. The toxicity of K salts to N. triangulifer was similar to Na salts on a millimolar basis, which contrasts with several other species for which K salts have been much more toxic. In addition, the toxicity of KCl to N. triangulifer was not notably affected by Na concentration, as has been shown for Ceriodaphnia dubia. Finally, plotting LC50s in terms of ion activity (Cl, SO4 , Na, Mg, or K) over the range of Ca activities in dilution water resulted in significant positive relationships, with comparable slopes to those previously observed for C. dubia over the same range of Ca activities. Environ Toxicol Chem 2018;37:1330-1339. © 2018 SETAC. |
| Databáze: | OpenAIRE |
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