Download or read book Development of Chronic Sublethal Bioassay for Evaluating Contaminated Sediment with the Marine Polychaete Worm Nereis Neanthes Arenaceodentata written by Tom M. Dillon and published by . This book was released on 1994 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long Term Effects of Dredging Operations Program Development of a Chronic Sublethal Bioassay for Evaluating Contaminated Sediment with the Marine Polychaete Worm Nereis Neanthes Arenaceodentata written by and published by . This book was released on 1994 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of a chronic sublethal sediment bioassay with the polychaete Nereis (Neathes) arenaceodentata is described. The sublethal test end point was estimated individual somatic growth rate (milligrams dry weight per day). The test was initiated with 2- to 3-week-old post-emergent juvenile worms and continued for 28 days. The potential bias due to selected nontreatment factors on polychaete survival and growth was evaluated. For example, grain size had no significant effect, whereas the number of worms placed in each exposure vessel was critical. Direct transfer from 30% seawater to salinities less than or equal 15% had a highly significant and adverse effect on survival and growth. Both survival and growth of juvenile worms may be adversely affected if test conditions involve exposures to greater than or equal 0.7 mg/L un-ionized ammonia or greater than or equal 5 mg/L hydrogen sulfide. Survival of juvenile worms to concentrations of the reference toxicant, cadmium chloride, approximating the 96-hr LC50 (5 mg/L) was used as a quality control measure. Results are expressed in control chart format analogous to methods used in analytical chemistry. Chronic, Neanthes, Sublethal, Growth, Sediment.
Download or read book A 28 Day Sediment Bioassay with the Marine Polychaete NEREIS NEANTHES ARENACEODENTATA written by TM. Dillon and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A protocol for conducting a 28 day sediment bioassay with the marine polychaete, Nereis (Neanthes) arenaceodentata is described. Primary application is the regulatory evaluation of dredged material. Test endpoints are survival and estimated individual growth rate. Bioassays are initiated by adding juvenile worms to 1L glass beakers (5 worms/beaker) containing aerated seawater (30 ‰) and 2-3 cm of sediment. Temperature is 20°C and photoperiod 12h. Worms are fed twice weekly, seawater renewed weekly and water quality monitored throughout. After 28 days, the number of survivors per beaker is recorded. Worms in each replicate are dried as a pool. Estimated individual dry weight is calculated by dividing number of survivors into the pooled dry weight biomass. Growth rate (mg dry weight day-1) is calculated by subtracting initial from final dry weights and dividing by the exposure period (28 d). Performance criteria for positive and negative controls are discussed as well as guidance for interpreting bioassay results. Although designed for the regulatory evaluation of dredged material, this chronic sublethal bioassay can be applied to other assessments of sediment quality.
Download or read book Toxicological Profile for Hydrogen Sulfide written by and published by . This book was released on 2006 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Toxicology and Chemistry written by and published by . This book was released on 2001 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioavailability of Contaminants in Soils and Sediments written by National Research Council and published by National Academies Press. This book was released on 2003-05-03 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.
Download or read book Chronic Sublethal Effects of San Francisco Bay Sediments on Nereis Neanthes Arenaceodentata written by David Warren Moore and published by . This book was released on 1994 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Toxicology and Risk Assessment written by Joseph W. Gorsuch and published by ASTM International. This book was released on 1993 with total page 733 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1995 with total page 1994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin of the Southern California Academy of Sciences written by Southern California Academy of Sciences and published by . This book was released on 1994 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chronic sublethal effects of san francisco bay sediments on nereis neanthes arenaceodentata nontreatment factors written by and published by . This book was released on 1992 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Initial development of a chronic sublethal sediment bioassay with the polychaete Nereis (Neanthes) arenaceodentata is described. The test was initiated with 2to 3-week-old postemergent juvenile worms and terminated after 21 days. The sublethal test end point was estimated individual somatic growth rate (milligrams dry weight/day). The potential bias due to selected nontreatment factors on polychaete survival and growth was evaluated. For example, grain size had no effect, while the number of worms added to each exposure vessel was critical. Direct transfer from 30 ppt to salinities or = ppt had a highly significant and adverse effect on survival and growth. Both survival and growth of juvenile worms may be adversely affected if test conditions involve exposures to or = mg/L ammonia or> or = mg/L hydrogen sulfide ... Chronic, Growth, Neanthes, Sediment, Sublethal.
Download or read book Annual Report written by Southern California Coastal Water Research Project and published by . This book was released on 2006 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biennial Report written by Southern California Coastal Water Research Project and published by . This book was released on 2005 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 1450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Dredged Material Proposed for Discharge in Waters of the U S Testing Manual draft written by and published by . This book was released on 1994 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microscale Testing in Aquatic Toxicology written by Peter G. Wells and published by CRC Press. This book was released on 2018-05-04 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioassays are among the ecotoxicologist's most effective weapons in the evaluation of water quality and the assessment of ecological impacts of effluents, chemicals, discharges, and emissions on the aquatic environment. Information on these assessment aids is needed throughout the international scientific and environmental management community. This comprehensive reference provides an excellent overview of the small-scale aquatic bioassay techniques and applications currently in use around the world. This special volume is the result of several years of collaboration between Environment Canada and Fisheries and Oceans Canada. Internationally recognized research scientists at many institutions have contributed to this state-of-the-art examination of the exciting, environmentally important field of microscale testing in aquatic toxicology. Microscale Testing in Aquatic Toxicology contains over forty chapters covering relevant principles, new techniques and recent advancements, and applications in scientific research, environmental management, academia, and the private sector.
Download or read book Evaluation of dredged material proposed for discharge in waters of the U S testing manual inland testing manual written by and published by DIANE Publishing. This book was released on with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
