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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

In a GLP study conducted according to OECD Guideline 208, the 18-d NOEC values for the growth of Avena sativa, Lactuca sativa and Lycopersicon esculentum were 1000, 100 and 320 mg trisodium EDDS/kg of dry soil, respectively. The corresponding 18-d NOECs for their condition (visual appearance) were 1000, 32 and 100 mg/kg of dry soil, respectively, and for their emergence and survival were 1000, 320, 1000 mg/kg of dry soil, respectively. 

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for terrestrial plants:
32 mg/kg soil dw

Additional information

A GLP study was conducted, according to OECD Guideline 208, to determine the toxicity of trisodium EDDS to the plant species Avena sativa (oat), Lactuca sativa (lettuce) and Lycopersicon esculentum (tomato). In the main study, five test concentrations of trisodium EDDS (i.e. 0, 10, 32, 100, 320 and 1000 mg/kg of dry soil) were tested on 4 x 5 plants over 18 days. The plants were grown in a mixture of agricultural soil and coarse sand, supplemented with potassium and phosphorus to assess the emergence of the seedlings, survival of seedlings, and visual appearance and growth (wet-weight at the end of the test) of the plants. Under the conditions of this study, the 18-d NOEC values for the growth of A. sativa, L. sativa and L. esculentum was 1000, 100 and 320 mg/kg of dry soil, respectively. The corresponding 18-d NOECs for their condition (visual appearance) was 1000, 32 and 100 mg/kg of dry soil, respectively, and for their emergence and survival was 1000, 320 and 1000 mg/kg of dry soil, respectively (Henzen, 1999b).

[Data on trisodium EDDS is considered relevant to use for understanding the potential toxicity to terrestrial plants of EDDS acid, and is acceptable for using as read-across information.]

The updated OECD Guideline 208 is designed to assess the potential effects of substances on seedling emergence and growth. Therefore, it is specific to a part of the plants life-cycle and does not cover chronic effects or effects on reproduction. However, it is assumed to cover a sensitive stage in the life-cycle of a plant and therefore data obtained from this study have been used in estimates of chronic toxicity.