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Standard Practice for Using Octanol-Water Partition Coefficient to Estimate Median Lethal Concentrations for Fish Due to Narcosis
Automaticky preložený názov:
Štandardné praktiky pre použitie oktanol-voda Rozdeľovací koeficient pre odhad stredná letálna koncentrácia pre ryby kvôli narkóze
NORMA vydaná dňa 1.10.2014
Označenie normy: ASTM E1242-97(2014)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.10.2014
Kód tovaru: NS-40987
Počet strán: 2
Približná hmotnosť: 6 g (0.01 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
ICS Number Code 07.080 (Biology. Botany. Zoology)
Significance and Use | ||||||||
5.1 This procedure can be used to limit the need for screening tests prior to performing a test for estimating the LC50 of a non-reactive and non-electrolytic chemical to the fathead minnow. By eliminating the screening test, fewer fish need be tested. The time used for preparing and performing the screening test can also be saved. The value obtained in this procedure can be used as the preliminary estimate of the LC50 in a full-scale test. 5.2 Estimates can be used to set testing priority of groups of non-reactive and non-electrolytic chemicals. 5.3 If the estimated value is more than 0.3 times the experimental value, the mechanism of action is probably narcosis. If less, the effect concentration is considered to reflect a different mechanism of action. 5.4 This practice estimates a maximum LC50, that is, non-reactive and non-electrolytic chemicals are at least as toxic as the practice predicts, but may have a lower LC50 if acting by a more specific mechanism. Data on a chemical indicating a lower toxicity than predicted should be considered suspect or an artifact because of limited solubility of the test material. |
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1. Scope | ||||||||
1.1 This practice covers a procedure for
estimating the fathead minnow (Pimephales promelas) 96-h LC50 of
nonreactive (that is, covalently bonded without unsaturated
residues) and nonelectrolytic (that is, require vigorous reagents
to facilitate substitution, addition, replacement reactions and are
non-ionic, non-dissociating in aqueous solutions) organic chemicals
acting solely by narcosis, also referred to as Meyer-Overton
toxicity relationship.1.2 This procedure is accurate for
organic chemicals that are toxic due to narcosis and are
non-reactive and non-electrolytic. Examples of appropriate
chemicals are: alcohols, ketones, ethers, simple halogenated
aliphatics, aromatics, and aliphatic substituted aromatics. It is
not appropriate for chemicals whose structures include a potential
toxiphore (that structural component of a chemical molecule that
has been identified to show mammalian toxicity, for example CN is
known to be reponsible for inactivation of enzymes,
NO
Standard Guide for Conducting Acute
Toxicity Tests on Test Materials with Fishes, Macroinvertebrates,
and Amphibians (Includes all amendments and changes 2/22/2023). Standard Guide for Assessing the Hazard
of a Material to Aquatic Organisms and Their Uses Standard Terminology Relating to
Biological Effects and Environmental Fate Standard Test Method for Partition
Coefficient (N-Octanol/Water) Estimation by Liquid
Chromatography |
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