Record Display for the EPA National Library Catalog
RECORD NUMBER: 29 OF 40| Main Title | Sensitivity of vertebrate embryos to boron compounds : April 1977 : final report / | ||||||||||||||||||||||||||
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| Author | Birge, Wesley J. ; Black., J. A. | ||||||||||||||||||||||||||
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| CORP Author | Thomas Hunt Morgan School of Biological Sciences, Lexington, Ky.;Environmental Protection Agency, Washington, D.C. Office of Toxic Substances.; United States. Environmental Protection Agency. Office of Toxic Substances. | ||||||||||||||||||||||||||
| Publisher | Office of Toxic Substances, Environmental Protection Agency, | ||||||||||||||||||||||||||
| Year Published | 1977 | ||||||||||||||||||||||||||
| Report Number | EPA-560/1-76-008; EPA-68-01-3222; PB267085 | ||||||||||||||||||||||||||
| Stock Number | PB-267 085 | ||||||||||||||||||||||||||
| OCLC Number | 44724273 | ||||||||||||||||||||||||||
| Subjects | Boron ; Embryology--Vertebrates | ||||||||||||||||||||||||||
| Additional Subjects | Toxicity ; Boron ; Embryos ; Aquatic animals ; Larvae ; Toxicology ; Bioassay ; Vertebrates ; Concentration(Composition) ; Mortality ; Trout ; Catfishes ; Frogs ; Toads ; Amphibia ; Chickens ; Comparisons ; Experimental data ; Water pollution effects(Animals) ; Teratogenesis ; Goldfish ; Threshold limit values ; Baron ; Embryology--Vertebrates | ||||||||||||||||||||||||||
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| Collation | 66 pages : illustrations ; 28 cm. | ||||||||||||||||||||||||||
| Abstract | Developmental stages of rainbow trout, channel catfish, goldfish, leopard frog, and Fowler's toad were treated in a continuous flow system with boric acid and borax concentrations ranging from 0.001-300 ppm boron. Exposure was initiated subsequent to fertilization and maintained through 4 days posthatching, using water with hardness levels of 50 and 200 ppm CaCO3. Expressed in ppm boron at 4 days posthatching, LC1 values for trout, catfish, and goldfish were 0.1, 0.5, and 0.6 for boric acid in soft water, 0.001, 0.2, and 0.2 for boric acid in hard water, 0.07, 5.5, and 1.4 for borax in soft water, and 0.07, 1.7, and 0.9 for borax in hard water. LC50 values in ppm for trout, catfish, and goldfish were 100, 155, and 46 for boric acid in soft water, 79, 22, and 75 for boric acid in hard water, 27, 155, and 65 for borax in soft water, and 54, 71, and 59 for borax in hard water. The LC50 values for amphibian embryos and larvae ranged from 47 for borax in soft water to 145 for boric acid in soft water. By comparison, boron LC50 values for chick embryos, treated by yolk injection, were 1.0 and 0.5 ppm for boric acid and borax, respectively. |
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| Notes | Contract no. 68-01-3222. "PB-267-085." "April 1977." Includes bibliographical references (pages 64-66). |