Registration Dossier

Ecotoxicological information

Toxicity to aquatic plants other than algae

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The only valid value for acute toxicity to freshwater plants is a 4-day EC50 >25.5 mg Sb/L for Lemna minor (Brooke et al, 1986).

Key value for chemical safety assessment

Additional information

In the study by Brooke et al. (1986), Lemna minor was exposed in a static test design to trivalent antimony (SbCl3) for 4 days. The endpoint studied was reduction in frond production. The test was performed in quadruplicate with five concentrations (range: 1.6 - 25.5 mg Sb/L) and a control, with 20 fronds in each test chamber. No EC50 could be obtained. However, in the highest exposure group, i.e. 25.5 mg Sb/l, a significant reduction in frond production occurred (32%). The resulting NOEC from this study was 12.5 mg Sb/L, with the corresponding LOEC 25.5 mg Sb/L.

Fjallborg and Dave (2004) spiked sewage sludge with SbCl5and after 60 days equilibration grew radish, oats or lettuce. After 14 days cultivation the toxicity of the elutriate to Lemna minor was tested. The authors report that the dry weight of Lemna minor was not consistently affected by Sb concentration up to a maximum test concentration of 0.22mg Sb/L. Although this study included analytical monitoring of the elutriate, its non-standard design and unbounded LOEC make it unsuitable for use in the assessment.