Výsledky vyhledávání - "Robert L. Spehar"

Comparative Toxicity of Fluoranthene to Freshwater and Saltwater Species Under Fluorescent and Ultraviolet Light

Autor: L T Brooke, D A Cox, S Poucher, D Champlin, Robert L. Spehar, David J. Hansen

Publikováno v: Archives of Environmental Contamination and Toxicology. 37:496-502

The acute and chronic toxicity of fluoranthene was determined for a diverse group of freshwater and saltwater species under both standard laboratory fluorescent light and ultraviolet (UV) light test conditions. Acute tests with 21 species demonstrate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::586432c02af098831c4da9b5bb66a919
https://doi.org/10.1007/s002449900544

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Effects of laboratory test conditions on the toxicity of silver to aquatic organisms

Autor: Michael D. Kahl, Thomas P. Markee, Robert L. Spehar, Russell J. Erickson, Fred Vende Venter, Sandra L. Harting, Larry T. Brooke

Publikováno v: Environmental Toxicology and Chemistry. 17:572-578

The effects of various chemical manipulations of test water on acute toxicity of silver to fathead minnows (Pimephales promelas) were investigated. Increases in hardness and organic carbon substantially reduced toxicity. Toxicity was also inversely r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2e4fab1a1d764cae00c2c00f2437b009
https://doi.org/10.1002/etc.5620170407

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Comparative toxicity and bioconcentration of nonylphenol in freshwater organisms

Autor: Larry T. Brooke, Michael D. Kahl, Robert L. Spehar, Thomas P. Markee

Publikováno v: Environmental Toxicology and Chemistry.

Degradation of alkylphenol ethoxylates to more persistent alkylphenols such as nonylphenol occurs in wastewater treatment plants where nonylphenol is released to aquatic systems. In this study, acute and chronic tests were conducted to determine the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c915267618dffc83d6346d87896bca9
https://doi.org/10.1002/etc.262

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Estimation of Effect Thresholds for the Development of Water Quality Criteria

Autor: Patricia Shaw-Allen, Susan M. Cormier, Robert L. Spehar, John F. Paul

Publikováno v: Real-Time and Deliberative Decision Making ISBN: 9781402090257

Biological and ecological effect thresholds can be used for determining safe levels of nontraditional Stressors. The U.S. EPA Framework for Developing Suspended and Bedded Sediments (SABS) Water Quality Criteria (WQC) [36] uses a risk assessment appr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4edd53a04b7148935fdfa5625d81f544
https://doi.org/10.1007/978-1-4020-9026-4_9

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Using Field Data and Weight of Evidence to Develop Water Quality Criteria

Autor: Patricia Shaw-Allen, Robert L. Spehar, Susan M. Cormier, Glenn W. Suter, John F. Paul, Walter J. Berry

Publikováno v: Integrated Environmental Assessment and Management. 4:490

In the United States, ambient aquatic life water quality criteria are derived using guidelines developed in 1985 that include a clear and consistent methodology using data from standard toxicity tests. The methodology from these guidelines has been s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90c7cfc88a748448f8edd5ed5f0a4c8a
https://doi.org/10.1897/ieam_2008-018.1

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COMPARATIVE TOXICITY OF 2,3,7,8-TETRACHLORODIBENZO-p-DIOXIN TO SEVEN FRESHWATER FISH SPECIES DURING EARLY LIFE-STAGE DEVELOPMENT

Autor: Gregory E. Elonen, Robert L. Spehar, Joseph D. Fernandez, Russell J. Erickson, Joseph E. Tietge, Rodney D. Johnson, Gary W. Holcombe, Philip M. Cook

Publikováno v: Environmental Toxicology and Chemistry. 17:472

The toxic effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) to fathead minnow (Pimephales promelas), channel catfish (Ictalurus punctatus), lake herring (Coregonus artedii), medaka (Oryzias latipes), white sucker (Catastomus commersoni), northern

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c97824bfd148b372fa123d0b5952ee1a
https://doi.org/10.1897/1551-5028(1998)017<0472:ctotpd>2.3.co

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Chronic Effects of Cadmium and Zinc Mixtures on Flagfish (Jordanella floridae)

Autor: Robert L. Spehar, David L. DeFoe, Edward N. Leonard

Publikováno v: Transactions of the American Fisheries Society. 107:354-360

Flagfish were exposed to cadmium and zinc as individual metals and as mixtures (4.3-8.5 μg Cd/liter and 73.4-139 μg Zn/liter) through one complete life cycle in Lake Superior water (45 mg/liter total hardness). Cadmium and zinc did not act additive

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b83a36cc160b088a4a5e89e43ef4e77a
https://doi.org/10.1577/1548-8659(1978)107<354:ceocaz>2.0.co

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Toxicity of the synthetic pyrethroids, permethrin and AC 222, 705 and their accumulation in early life stages of fathead minnows and snails

Autor: Beth R. Nordling, Danny K. Tanner, Robert L. Spehar

Publikováno v: Aquatic Toxicology. 3:171-182

Early life stages of fathead minnows ( Pimephales promelas ) were exposed to permethrin and AC 222, 705 and snails ( Helisoma trivolvis ) were exposed to permethrin in continuous flow-through exposures for approximately 30 days. Saturated solutions o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::299048739ea38af7b1d9cfd84c9b7204
https://doi.org/10.1016/0166-445x(83)90038-3

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