LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) Test substance: LAS; C 14 -LAS chain length C12 (91% purity) plus unlabeled LAS with average chain length C11.6 (C10 9.7%, C11 27.9%, C12 54.4%, C13 8.0%; 95% purity) (tested together) Remarks: Dissolved oxygen concentrations ranged between 7.0 and 9.0 mg/L. Temperature was maintained at 2°C and the mean pH was 8.1 ± 0.2. Bluegill fish growth was reduced at the 2.0 and 4.0 mg/L concentrations but not at 0.5 or 1.0 mg/L. Results for the other species and community parameters tested are summarized in Section 4.7 (i). Juvenile growth was the most sensitive fish endpoint in this model ecosystem study and thus is appropriate to use for chronic toxicity. This is a key study for chronic aquatic toxicity to fish (see SIAR Table 12). Reference: Maki, A.W. 1981. A Laboratory model ecosystem approach to environmental fate and effects studies. Unpublished Internal Report, Environmental Safety Department Procter and Gamble Company, Cincinnati, Ohio. Reliability: 2 Valid with restrictions 4.5.2 CHRONIC TOXICITY TO AQUATIC INVERTEBRATES Water-only Exposures (a) Type of test: static [ ]; semi-static [ ]; flow-through [ ]; open-system [ ]; closed-system [ ]; not stated [X] Species: Ceriodaphnia sp. (Crustacea) Endpoint: Mortality [ ]; Reproduction [X] Exposure period: not stated Results: NOEC = 3 mg/L Analytical monitoring: Yes [ ] No [ ] ? [X] Method: Standard laboratory methods. GLP: Yes [ ] No [] ? [X] Test substance: C11.7 LAS Remarks: Further information regarding study conditions was not provided in this peerreviewed publication. Reference: Kimerle, R.A. 1989. Aquatic and terrestrial ecotoxicology of linear alkylbenzene sulfonate. Tenside Surfactants Detergents, 26:169-176. Reliability: 4 Not assignable. Data table cites an unpublished report by Procter & Gamble. (b) Type of test: static [ ]; semi-static [X]; flow-through [ ]; open-system [ ]; closed-system [X]; not stated [ ] Species: Ceriodaphnia sp. (Crustacea) Endpoint: Mortality [X]; Reproduction [X] Exposure period: 7 day Results: NOEC = 0.7 mg/L (geometric mean of two tests); 0.84 mg/L (normalized for C11.8 LAS) NOEC = 0.5 mg/L (trout chow/algae diet) EC10 = 0.99 mg/L (yeast diet); normalized EC10 = 1.18 mg/L Analytical monitoring: Yes [ ] No [X] ? [ ] Method: ASTM (Commotto 1982; Mount and Norberg 1983). Ceriodaphnia were cultured individually in 50 mL beakers containing 30 mL culture water. Two tests were conducted, representing animals fed with two different diets (troutchow and algae – Selenastrum capricornutum – or baker’s yeast). They were acclimated to the test conditions and diet for two generations UNEP PUBLICATIONS 208
OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) before use in toxicity testing. Ten 50 mL beakers containing 30 mL of test solution were used for each test concentration. Nominal concentrations were 0.5, 1.0, 2.0, 3.5, 5.0 and 7.0 mg/L plus controls. Each beaker contained one Ceriodaphnia (for a total of 10 daphnids per concentration). Tests were begun with neonate animals (
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LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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