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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

EC50 = 53.9 mg/kg soil dw; NOEC = 12.5 mg/kg soil dw for Avena sativa based on fresh weight
EC50 = 62.9 mg/kg soil dw; NOEC = 25 mg/kg soil dw for Brassica napus based on fresh weight
EC50 = 89.7 mg/kg soil dw, NOEC = 25 mg/kg soil dw for Glycine max based on fresh weight

Key value for chemical safety assessment

Short-term EC50 or LC50 for terrestrial plants:
53.9 mg/kg soil dw
Long-term EC10, LC10 or NOEC for terrestrial plants:
12.5 mg/kg soil dw

Additional information

The effects of OPP on terrestrial plants were studied in three plant species of three different families: Brassica napus, Glycine max and Avena sativa (Bützler & Meinerling 2008). The test was performed for 14 days in a growth chamber under controlled test conditions and the plants were exposed to concentrations between 12.5 and 100 mg 2-Phenylphenol/kg dry soil according to OECD Guideline 208. The concentrations in the test with Glycine max ranged from to 200 mg test item/kg dry soil. Test parameters were germination rate, mortality and phytotoxicity.

Phytotoxic effects observed were growth reduction (all species), slight chlorosis (Brassica napus and Glycine max) and slight necrosis (all species). Additionally, Brassica napus showed abnormal growth of the leaves, and Glycine max showed abnormal growth of the leaves and the stems.

The most sensitive species in terms of fresh weight was Avena sativa with EC50 value of 53.9 mg/kg soil dry weight and NOEC 12.5 mg/kg soil dry weight. It was followed by Brassica napus (EC50 62.9 and NOEC 25 mg/kg soil dry weight). The least sensitive species was Glycine max which showed an EC50 value of 89.7 and NOEC 25 mg/kg soil dry weight.