Registration Dossier
Registration Dossier
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EC number: 273-234-6 | CAS number: 68953-96-8 This substance is identified by SDA Substance Name: C11-C13 branched alkyl benzene sulfonic acid calcium salt and SDA Reporting Number: 25-097-06.
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
Three studies on terrestrial plants using LAS were used to develop the soil PNEC. EC50 values ranged from 90 to 204 mg/kg soil dw. EC10 values ranged from 52 to 200 mg/kg soil dw.
Key value for chemical safety assessment
- Short-term EC50 or LC50 for terrestrial plants:
- 90 mg/kg soil dw
- Long-term EC10, LC10 or NOEC for terrestrial plants:
- 52 mg/kg soil dw
Additional information
No specific studies on Branched CaDDBS were available. However, a series of studies are available that assessed the toxicity of LAS to various terrestrial plant species. In the first, the toxicity to three species of plant, sunflower, sorghum, and mung bean, was determined. Seeds of these three species were grown in soil containing concentrations of the test ingredient of 0, 1, 10, 100, 1000 mg/kg active ingredient in dry soil. The emergence and growth of seedlings was monitored for 21 days. There was a decrease in emergence of all three species at the highest concentration, with some shoots barely emerging, and stunted and dying. The NOEC for all three species is 100 mg/kg active ingredient. The 21 day EC50 for sunflower was 289 mg/kg active ingredient, for sorghum it was 167 mg/kg AI, and for mung bean it was 316 mg/kg active ingredient. In the second study, three species of crop plant B. rapa, A. sativa, and S. alba, were grown in soil containing concentrations of LAS that varied from 0 -10,000 mg/kg dw soil. The seedlings were grown for 14 days, and then weighed and compared to weights of controls plants. All three species showed a dose-related reduction in growth. The EC10 for B. rapa was 86 mg/kg dw soil, for A. sativa it was 80 mg/kg dw soil, and for S. alba it was 200 mg/kg dw soil. In a third study, plants from seven different species were exposed to concentrations of 0, 1, 10, 100, and 1000 mg/kg dw of LAS for 14 days, after which their weights were determined. The following EC50s were found: Malva pusilla 204 mg/kg dw, Solanum nigrum 169 mg/kg dw, Chenopodium album 164 mg/kg dw, Amaranthus retroflexus 142 mg/kg dw, Nigella arvensis 133 mg/kg dw, Galinsoga parviflora 90 mg/kg dw, and Brassica rapa 164 mg/kg dw. Also, the following EC10s were found: Malva pusilla 110 mg/kg dw, Solanum nigrum 120 mg/kg dw, Chenopodium album 120 mg/kg dw, Amaranthus retroflexus 110 mg/kg dw, Nigella arvensis 52 mg/kg dw, Galinsoga parviflora 55 mg/kg dw, and Brassica rapa 86 mg/kg dw.
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