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Titolo:
The influence of water hardness, pH, and suspended solids on nickel toxicity to larval fathead minnows (Pimephales promelas)
Autore:
Pyle, GG; Swanson, SM; Lehmkuhl, DM;
Indirizzi:
Univ Saskatchewan, Dept Biol, Saskatoon, SK S7N 5E2, Canada Univ Saskatchewan Saskatoon SK Canada S7N 5E2 skatoon, SK S7N 5E2, Canada Golder Associates, Calgary, AB T2P 3T1, Canada Golder Associates Calgary AB Canada T2P 3T1 , Calgary, AB T2P 3T1, Canada
Titolo Testata:
WATER AIR AND SOIL POLLUTION
fascicolo: 1-4, volume: 133, anno: 2002,
pagine: 215 - 226
SICI:
0049-6979(200201)133:1-4<215:TIOWHP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAINBOW-TROUT; CADMIUM-BINDING; ION REGULATION; FISH GILLS; COPPER; CALCIUM; ONTARIO; METALS;
Keywords:
fathead minnow; fish; nickel toxicity; pH; total suspended solids; water hardness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Pyle, GG Laurentian Univ, Dept Biol, Ramsey Lake Rd, Sudbury, ON P3E 2C6, Canada Laurentian Univ Ramsey Lake Rd Sudbury ON Canada P3E 2C6 , Canada
Citazione:
G.G. Pyle et al., "The influence of water hardness, pH, and suspended solids on nickel toxicity to larval fathead minnows (Pimephales promelas)", WATER A S P, 133(1-4), 2002, pp. 215-226

Abstract

Nickel (Ni) is an ubiquitous, naturally occurring metal that is associatedwith metal mining and other industrial activities. Despite elevated Ni concentrations reported for many industrial receiving waters, Ni receives little research attention addressing factors influencing its toxicity to freshwater fish. This study examined the influence of water hardness, pH, and total suspended solids (TSS) in soft, reconstituted water on Ni toxicity to larval fathead minnows (Pimephales promelas). Increasing water hardness from 20 to 140 mg L-1 (as CaCO3) reduced acute Ni toxicity by 5-fold (96-h LC50s0.45 and 2.27 mg Ni L-1, respectively). Low pH had a slight protective effect against Ni toxicity relative to neutral pH conditions. At pH 5.5, the 96-h LC50 was 0.69 mg Ni L-1, compared to 0.54 mg Ni L-1 at pH 7.0. However,Ni toxicity was significantly reduced at pH 8.5 where the 96-h LC50 was 2.21 mg Ni L-1. These results were explained on the basis of Ni speciation. Total suspended solids also reduced Ni toxicity (expressed as 96-h LC50s) from 0.35 to 1.12 mg Ni L-1 over a TSS range of 10 to 100 mg L-1. This reduction of toxicity due to TSS is significant because mine effluents often havea combination of elevated TSS and metals. The ameliorative effect of TSS was not as significant as high hardness or pH probably because there is a TSS threshold, after which physical irritation to fish gills counteracts any protective effect conferred by TSS. This finding is relevant to choices made in design of mine effluent treatment systems; i.e., there may be an optimum range of TSS concentrations that protect aquatic biota against effects of metals that remain after treatment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 01:32:51