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EC number: 270-115-0 | CAS number: 68411-30-3
The following table shows the results of all tests. All values are nominal LAS concentrations in mg/kg dry weight.
LC10 or EC10
LC50 or EC50
Rationale for Reliability Rating
Draft ISO/WD 16387 protocol
Deviations; limited cocoons
Comparable to ISO 11268-2, but with only weight measurement
Comparable to ISO 11267
No guideline available
Groups of H. assimilis and H. aculeifer were exposed to various concentrations of test material for 21 days. At the end of this period, the number of offspring were counted. Based on reproduction, The EC10 for H. assimilis was 100 mg/kg dry weight, and the EC10 for H. aculeifer was 82 mg/kg dry weight.
Groups of 10 male and 10 female Folsomia fimetaria were exposed to various concentrations of Na-LAS in three different soil types for 21 days. At the end of this period, the number of adult and juvenile organisms was counted. Another test was done to compare the toxicity of three LAS salts, Na, Ca, and Mg, in one soil type (sandy). There was little variation in toxicity among the three soil types and in the three salt species. The EC10 for Folsomia fimetaria in various soils ranged from 85-93 mg/kg dry weight soil.
Groups of F. candida were exposed to concentrations of 25-300 mg LAS/kg soil. Exposure lasted 28 days, after which adult survival and reproductive parameters were examined. The EC10 based on reproduction was 205 mg/kg soil.
Groups of 10 male and 10 female Folsomia fimetaria were exposed to nominal concentrations of 50, 100, 200, 400, and 800 mg/kg soil dw of LAS for 21 days. At the end of this period, the number of organisms were counted. The EC10 for F. fimetaria was 161 mg/kg soil dw based on reproduction.
Groups of 10 male and 10 female F. fimetaria were exposed to concentrations of LAS ranging from 0 -1000 mg/kg dw soil for 21 days. At the end of the 21 days, the number of F. fimetaria were counted, and the number of surviving adults and juveniles as the result of reproduction were counted. There was no effect on adult survival, however, there was a dose-related decrease in reproduction. The EC10 based on reproduction was 147 mg/kg dw soil.
Groups of 20 P. Peltifer mites were exposed to various concentrations of LAS up to 1000 mg/kg dw soil. The exposure lasted 10 weeks. The mortality and reproduction of the mites at the end of this period was assessed. The NOEC for P. peltifer, based on reproduction was 320 mg/kg dw soil. The LOEC was 1000 mg/kg dw soil.
A series of studies have been conducted on soil macroorganisms that include or exclude arthropods. The primary route of entry for LAS into the terrestrial environment is land application of sewage sludge intended as an amendment to agricultural lands. A large number of terrestrial ecotoxicology studies were reviewed by Jensen et al. (2007) to develop a European wide risk assessment of LAS in agricultural soils. Nine invertebrate species, three oligochaetes and six arthropods, have been evaluated in chronic toxicity to LAS in soil. Endpoints were all considered sensitive for these taxa. Only growth and reproduction endpoints were used in the PNEC derivation for soil. Effects on oligochaetes (Table 37) and arthropods (Table 38) were highly overlapping.
A European-wide risk assessment of LAS in agricultural soils was developed based on review of terrrestrial ecotoxicology studies. Six arthropods have been evaluated in chronic toxicity studies of LAS in soil. Only growth and reproduction endpoints were used in the PNEC derivation for soil. NOECs or EC10s for arthropods varied from 41-320 mg/kg soil. F. fimeteria had EC10s that ranged from 85-161 mg/kg soil for the reproduction endpoint (most sensitive).
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