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EC number: 205-055-6 | CAS number: 132-27-4
Toxicity to terrestrial arthropods
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
According to Annex VII of Regulation (EC) No 1907/2006 the
generation of soil data is not required. Experimental data on the
toxicity of sodium 2-biphenylate (CAS 132-27-4) to terrestrial
arthropods is not available.
The assessment of terrestrial toxicity is based on read across data
available for 2-phenylphenol (CAS 90-43-7), the conjugate acid of sodium
2-biphenylate (CAS 132-27-4). Data are available for three trophic
levels. In an earthworm test the effects of the source substance
2-phenylphenol (CAS 90-43-7) onEisenia fetidawere investigated.
The LC50 value was 198.2 mg test item/kg dw. The NOEC for mortality as
well as the NOEC for biomass was determined to be 125 mg test item/kg dw.
The effects of the source substance 2-phenylphenol (CAS 90-43-7) on terrestrial plants were studied in three plant species of three different families:Brassica napus, Glycine maxandAvena sativa. Test parameters were germination rate, mortality and phytotoxicity. Phytotoxic effects observed were growth reduction (all species), slight chlorosis (Brassica napusandGlycine max) and slight necrosis (all species). Additionally,Brassica napusshowed abnormal growth of the leaves, andGlycine maxshowed abnormal growth of the leaves and the stems.
The most sensitive species in terms of fresh weight wasAvena sativawith EC50 value of 53.9 mg/kg soil dry weight and NOEC 12.5 mg/kg soil dry weight. It was followed byBrassica napus(EC50 62.9 and NOEC 25 mg/kg soil dry weight). The least sensitive species wasGlycine maxwhich showed an EC50 value of 89.7 and NOEC 25 mg/kg soil dry weight.
Furthermore, the effects the source substance 2-phenylphenol on soil nitrification of soil micro-organisms were tested over an exposure period of 100 days. The NOEC of 2-phenylphenol (CAS 90-43-7) was calculated to be 300 mg/kg soil dry weight 28 days and 100 days after application. The EC50 was calculated to be 633.5 mg/kg and 829.1 mg/kg soil dry weight 28 days and 100 days after application, respectively. In an additional test on soil respiration and nitrification, 2-phenylphenol (CAS 90-43-7) had no impact on respiration and nitrogen transformation of soil microflora when applied up to 1.0 mg a.i./kg soil.
The source and the target substance are considered as readily biodegradable and are characterised by a low adsorption potential. Thus, the exposure of terrestrial organisms like terrestrial arthropods is considered to be low. Since only very small amounts of the substances are expected to reach the soil and the available data on microorganisms, terrestrial plants and earthworms are sufficient for the risk assessment, no further testing is required.
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