ISSN:
1432-0703
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
,
Medicine
Notes:
Abstract The toxicities of 2,3,4,6-tetrachlorophenol (TeCP) and pentachlorophenol (PCP) were determined in standardized, single-species laboratory toxicity tests using daphnids and rotifers. For Daphnia magna, 48-h LC50 estimates with neonates indicated that PCP was more toxic than TeCP. The commercial TeCP formulation DIATOX®, containing a 6.5:1 ratio of TeCP:PCP, exhibited intermediate toxicity. Mean LC50 estimates were 1.23, 2.66, and 2.07 mg/L, respectively. All three LC50 estimates were significantly different (p〈0.05). Daphnia galeata mendotae was more sensitive to TeCP than D. magna displaying a mean 48-h LC50 value of 0.58 mg/L. A 21-d partial life cycle test with D. magna revealed no effects at 0.25 mg/L TeCP, but a significant (p〈0.05) increase in adult mortality was noted at 0.50 mg/L TeCP. There was no effect on reproductive success of surviving adults at any test concentration. Rotifer tests, conducted with a commercially available species (Brachionus calyciflorus) and a field collected species (Keratella cochlearis), also indicated that PCP was more acutely toxic than TeCP. LC50 estimates for B. calyciflorus were highly variable depending upon the source of resting eggs (cysts) and the test conditions. LC50 estimates (24-h) ranged from 2.09 to 7.76 mg/L for PCP and from 2.31 to 〉16.00 mg/L for TeCP. In general, B. calyciflorus was less sensitive to TeCP and PCP than D. magna and D. g. mendotae. Assays with K. cochlearis were only marginally successful, but the mean 12-h LC50 estimate for TeCP of 0.96 mg/L suggested that this species may be more sensitive to TeCP than B. calyciflorus.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00224807
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